Release 1.1.4

compile-tests is not yet available because this needs EpoxDuino develop branch to be merged.
So compile tests are  disabled for now.

.github/workflows/aunit.yml

@@ -9,7 +9,7 @@ on: [push]
 jobs:
   build:
 
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     steps:
     - uses: actions/checkout@v2
@@ -17,9 +17,10 @@ jobs:
     - name: Setup
       run: |
         cd ..
-        git clone https://github.com/bxparks/EpoxyDuino
+        git clone https://github.com/hsaturn/TinyConsole
+        git clone https://github.com/hsaturn/EpoxyDuino
         git clone https://github.com/bxparks/AceRoutine
-        git clone https://github.com/bxparks/AUnit
+        git clone https://github.com/hsaturn/AUnit
         git clone https://github.com/bxparks/AceCommon
         git clone https://github.com/hsaturn/EspMock
     - name: Verify tests

README.md

@@ -10,8 +10,22 @@
 
 TinyMqtt is a small, fast and capable Mqtt Broker and Client for Esp8266 / Esp32 / Esp WROOM
 
+### Statuses of all unit tests of TinyMqtt and its dependencies
+
+| Project     | Unit tests result |
+| ----------- | ------------ |
+| TinyMqtt    | [![](https://github.com/hsaturn/TinyMqtt/actions/workflows/aunit.yml/badge.svg)](https://github.com/hsaturn/TinyMqtt/actions/workflows/aunit.yml) |
+| Dependencies                  ||
+| TinyConsole | [![](https://github.com/hsaturn/TinyConsole/actions/workflows/aunit.yml/badge.svg)](https://github.com/hsaturn/TinyConsole/actions/workflows/aunit.yml) |
+| EpoxyDuino  | [![AUnit Tests](https://github.com/hsaturn/EpoxyDuino/actions/workflows/aunit_tests.yml/badge.svg)](https://github.com/hsaturn/EpoxyDuino/actions/workflows/aunit_tests.yml) |
+| EspMock     | [![AUnit Tests](https://github.com/hsaturn/EspMock/actions/workflows/aunit.yml/badge.svg)](https://github.com/hsaturn/EspMock/actions/workflows/aunit.yml) |
+| AUnit | [![AUnit Tests](https://github.com/hsaturn/AUnit/actions/workflows/aunit_tests.yml/badge.svg)](https://github.com/hsaturn/AUnit/actions/workflows/aunit_tests.yml) |
+| AceRoutine | [![AUnit Tests](https://github.com/bxparks/AceRoutine/actions/workflows/aunit_tests.yml/badge.svg)](https://github.com/bxparks/AceRoutine/actions/workflows/aunit_tests.yml) |
+
 ## Features
 
+- Supports retained messages (not activated by default)
+- Async Wifi compatible (me-no-dev/ESPAsyncTCP@^1.2.2)
 - Very fast broker I saw it re-sent 1000 topics per second for two
   clients that had subscribed (payload ~15 bytes ESP8266). No topic lost.
   The max I've seen was 2k msg/s (1 client 1 subscription)
@@ -24,6 +38,7 @@ TinyMqtt is a small, fast and capable Mqtt Broker and Client for Esp8266 / Esp32
 - zeroconf, this is a strange but very powerful mode where
   all brokers tries to connect together on the same local network.
 - small memory footprint (very efficient topic storage)
+- long messages are supported (>127 bytes)
 - TinyMQTT is largely unit tested, so once a bug is fixed, it is fixed forever
 
 ## Limitations
@@ -50,6 +65,13 @@ TinyMqtt is a small, fast and capable Mqtt Broker and Client for Esp8266 / Esp32
 - tinymqtt-test : This is a complex sketch with a terminal console
   that allows to add clients publish, connect etc with interpreted commands.
 
+## Retained messages
+
+Qos 1 is not supported, but retained messages are. So a new subscription is able to send old messages.
+This feature is disabled by default.
+The default retain parameter of MqttBroker::MqttBroker takes an optional (0 by default) number of retained messages.
+MqttBroker::retain(n) will also make the broker store n messages at max.
+
 ## Standalone mode (zeroconf)
 -> The zeroconf mode is not yet implemented
 zeroconf clients to connect to broker on local network.

bump_version.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+current_version=$(git describe --tags --abbrev=0)
+
+function error
+{
+	echo
+	echo "ERROR *** $1"
+}
+if [ "$1" == "-d" ]; then
+  do=0
+  shift
+else
+  do=1
+fi
+if [ "$1" == "" ]; then
+	echo
+	echo "Syntax: $0 [-d] {new_version} [commit message]"
+	echo
+	echo "  -d : dry run, generate json and update properties but do not run git commands"
+	echo ""
+	echo "  Current version: $current_version"
+	echo
+else
+	tm=$(git status --porcelain -- src/TinyMqtt.h | wc -l)
+	echo "Current version: ($current_version)"
+	echo "New version    : ($1)"
+	echo "Take info from : library.properties"
+	if [ "$tm" == "1" ]; then
+		error "You cannot bump version if TinyMqtt.h is modified"
+		exit
+	fi
+	echo -n "Do you want to proceed ? "
+	read a
+	if [ "$a" == "y" ]; then
+		echo "Doing this..."
+		grep $current_version library.properties
+		if [ "$?" == "0" ]; then
+			sed -i "s/$current_version/$1/" library.properties
+			sed -i "s/#define TINY_MQTT_REVISION/#define TINY_MQTT_REVISION \"$1\"/" src/TinyMqtt.h
+
+      cp library.json.skeleton library.json
+      while ifs= read -r line; do
+        name=$(echo "$line" | sed "s/=.*//g")
+        value=$(echo "$line" | cut -d= -f 2 | sed 's/"//g')
+        echo "  Replacing $name in json"
+        if [ "$name" == "depends" ]; then
+          depends=$(echo "$value" | sed "s/,/ /g")
+          echo "  Depends=$depends"
+        fi
+        sed -i "s@#$name@$value@g" library.json
+      done < library.properties
+      deps=""
+      for depend in $depends; do
+        if [ "$deps" != "" ]; then
+          deps="$deps, "
+        fi
+        deps="$deps'$depend' : '*'"
+      done
+      sed -i "s@#dependencies@$deps@g" library.json
+      sed -i "s/'/\"/g" library.json
+      if [ "$do" == "1" ]; then
+        echo "Pushing all"
+        git add library.properties
+        git add library.json
+        git commit -m "Release $1 $2"
+        git tag $1
+        git push
+        git push --tags
+      fi
+		else
+			error "Current version does not match library.property version, aborting"
+		fi
+	fi
+fi

examples/W5500/client-with-W5500-ESP8266/client-with-W5500-ESP8266.ino

@@ -0,0 +1,111 @@
+#include <SPI.h>
+#include <Ethernet.h>
+                        
+#include "TinyMqtt.h"   // https://github.com/hsaturn/TinyMqtt
+
+#define WIZRST D3   //Specify pin to use for reseting W5500
+#define WIZCS  D1   //Specify the pin for SPI CS
+
+#define PORT 1883
+MqttBroker broker(PORT);
+unsigned long Time;
+unsigned long freeRam;
+
+/** Basic Mqtt Broker
+  *
+  *  +-----------------------------+
+  *  | ESP                         |
+  *  |       +--------+            |
+  *  |       | broker |            | 1883 <--- External client/s
+  *  |       +--------+            |
+  *  |                             |
+  *  +-----------------------------+
+  *
+  *  Your ESP will become a MqttBroker.
+  *  You can test it with any client such as mqtt-spy for example
+  *
+  */
+
+#if defined(USE_ETHERNET)
+
+byte mac[] = { 0x00, 0xAA, 0xBB, 0xE0, 0x01, 0x25 }; //MAC Address
+//IPAddress ip = (192,168,0,88); //Fixed IP Address
+
+#else
+
+const char* ssid = "xxxxxxx";
+const char* password = "xxxxxxxx";
+
+#endif
+
+
+void WizReset() {
+   Serial.print("Resetting Wiz W5500 Ethernet Board...  ");
+   pinMode(WIZRST, OUTPUT);
+   digitalWrite(WIZRST, HIGH);
+   delay(250);
+   digitalWrite(WIZRST, LOW);
+   delay(50);
+   digitalWrite(WIZRST, HIGH);
+   delay(350);
+   Serial.println("Done.");
+}
+
+void setup()
+{
+  Serial.begin(115200);
+  
+#if defined(USE_ETHERNET)
+
+  Ethernet.init(WIZCS);  // SPI CS Pin
+  SPI.begin();
+  WizReset();
+  Console << TinyConsole::green << "Starting Ethernet...." << endl;
+  Ethernet.begin(mac); //Connect using DHCP
+  //Ethernet.begin(mac,ip); //Connect using Fixed IP
+  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
+    Console << TinyConsole::red << "Ethernet shield was not found.  Sorry, can't run without hardware. :(" << endl;
+  } else 
+  if (Ethernet.linkStatus() == LinkOFF) {
+    Console << TinyConsole::red << "Ethernet cable is not connected." << endl;
+  }
+  Console << TinyConsole::green << "Local Ethernet IP address: " << Ethernet.localIP() << endl;
+  broker.begin();
+  Console << "Broker ready (eth) : " << Ethernet.localIP() << " on port " << PORT << endl;
+
+#else
+
+  if (strlen(ssid)==0)
+    Console << TinyConsole::red << "****** PLEASE MODIFY ssid/password *************" << endl;
+  WiFi.disconnect();                 //Remove previous SSID & Password
+  WiFi.begin(ssid, password);        // Connect to the network
+  Console << TinyConsole::white << "WiFi Connecting to " << ssid << " ...";
+  int i = 0;
+  while (WiFi.status() != WL_CONNECTED) { // Wait for the Wi-Fi to connect
+    delay(1000);
+    Console << TinyConsole::white << ".";
+    i++;
+    if (i > 20) break;
+  }
+  Console << endl << endl;
+  Console << TinyConsole::green << "Connected to " << ssid << " IP address: " << WiFi.localIP() << endl;
+  broker.begin();
+  Console << "Broker ready (wifi) : " << WiFi.localIP() << " on port " << PORT << endl;  
+    
+#endif
+}
+
+void loop()
+{
+  broker.loop();
+  if(millis()-Time>10000) {
+     Time=millis();
+    if(ESP.getFreeHeap()!=freeRam)
+    {
+      freeRam=ESP.getFreeHeap();
+    Serial.print("RAM:");
+    Serial.println(freeRam);
+    }
+  }
+
+}

examples/W5500/client-with-W5500-RP2040/client-with-W5500-RP2040.ino

@@ -0,0 +1,117 @@
+#include <SPI.h>
+#include <Ethernet.h>
+                        
+#include "TinyMqtt.h"   // https://github.com/hsaturn/TinyMqtt
+
+#define WIZRST 20   //Specify pin to use for reseting W5500 = GPIO20
+#define WIZCS  17   //Specify the pin for SPI CS = GPIO17 = D5
+
+#define PORT 1883
+MqttBroker broker(PORT);
+unsigned long Time;
+unsigned long freeRam;
+
+/** Basic Mqtt Broker
+  *
+  *  +-----------------------------+
+  *  | ESP                         |
+  *  |       +--------+            |
+  *  |       | broker |            | 1883 <--- External client/s
+  *  |       +--------+            |
+  *  |                             |
+  *  +-----------------------------+
+  *
+  *  Your ESP will become a MqttBroker.
+  *  You can test it with any client such as mqtt-spy for example
+  *
+  */
+
+#if defined(USE_ETHERNET)
+
+byte mac[] = { 0x00, 0xAA, 0xBB, 0xE0, 0x01, 0x25 }; //MAC Address
+//IPAddress ip = (192,168,0,88); //Fixed IP Address
+
+#else
+
+const char* ssid = "xxxxxxx";
+const char* password = "xxxxxxxx";
+
+#endif
+
+
+void WizReset() {
+   Serial.print("Resetting Wiz W5500 Ethernet Board...  ");
+   pinMode(WIZRST, OUTPUT);
+   digitalWrite(WIZRST, HIGH);
+   delay(250);
+   digitalWrite(WIZRST, LOW);
+   delay(50);
+   digitalWrite(WIZRST, HIGH);
+   delay(350);
+   Serial.println("Done.");
+}
+
+void setup()
+{
+  Serial.begin(115200);
+  
+#if defined(USE_ETHERNET)
+
+  Ethernet.init(WIZCS);  
+  SPI.begin();
+  WizReset();
+  Console << TinyConsole::green << "Starting Ethernet...." << endl;
+  Ethernet.begin(mac); //Connect using DHCP
+  //Ethernet.begin(mac,ip); //Connect using Fixed IP
+  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
+    Console << TinyConsole::red << "Ethernet shield was not found.  Sorry, can't run without hardware. :(" << endl;
+  } else 
+  if (Ethernet.linkStatus() == LinkOFF) {
+    Console << TinyConsole::red << "Ethernet cable is not connected." << endl;
+  }
+  Console << TinyConsole::green << "Local Ethernet IP address: " << Ethernet.localIP() << endl;
+  broker.begin();
+  Console << "Broker ready (eth) : " << Ethernet.localIP() << " on port " << PORT << endl;
+
+#else
+
+  if (strlen(ssid)==0)
+    Console << TinyConsole::red << "****** PLEASE MODIFY ssid/password *************" << endl;
+  WiFi.disconnect();                 //Remove previous SSID & Password
+  WiFi.begin(ssid, password);        // Connect to the network
+  Console << TinyConsole::white << "WiFi Connecting to " << ssid << " ...";
+  int i = 0;
+  while (WiFi.status() != WL_CONNECTED) { // Wait for the Wi-Fi to connect
+    delay(1000);
+    Console << TinyConsole::white << ".";
+    i++;
+    if (i > 20) break;
+  }
+  Console << endl << endl;
+  Console << TinyConsole::green << "Connected to " << ssid << " IP address: " << WiFi.localIP() << endl;
+  broker.begin();
+  Console << "Broker ready (wifi) : " << WiFi.localIP() << " on port " << PORT << endl;  
+    
+#endif
+}
+
+void loop()
+{
+  broker.loop();
+  if(millis()-Time>10000) {
+     Time=millis();
+    #ifdef ARDUINO_ARCH_RP2040
+      if(rp2040.getFreeHeap()!=freeRam) {
+        freeRam=rp2040.getFreeHeap();
+    #else
+      if(ESP.getFreeHeap()!=freeRam) {
+        freeRam=ESP.getFreeHeap();
+    #endif
+    
+      
+    Serial.print("RAM:");
+    Serial.println(freeRam);
+    }
+  }
+
+}

examples/W5500/client-with-W5500-RP2040/readme

@@ -0,0 +1,5 @@
+In TinyString.h the operator
+
+  TinyString& operator +=(int);
+
+may need to be added.

examples/advanced/mqtt_class_binder/mqtt_class_binder.ino

@@ -0,0 +1,134 @@
+#include <TinyMqtt.h>   // https://github.com/hsaturn/TinyMqtt
+#include <MqttClassBinder.h>
+
+/**
+  * Example on how to bind a class:onPublish function
+  *
+  * Local broker that accept connections and two local clients
+  *
+  *
+  *  +-----------------------------+
+  *  | ESP                         |
+  *  |                 +--------+  | 1883 <--- External client/s
+  *  |       +-------->| broker |  | 1883 <--- External client/s
+  *  |       |         +--------+  |
+  *  |       |             ^       |
+  *  |       |             |       |
+  *  |       |             |       |     -----
+  *  |       v             v       |      ---
+  *  | +----------+  +----------+  |       -
+  *  | | internal |  | internal |  +-------*  Wifi
+  *  | | client   |  | client   |  |
+  *  | +----------+  +----------+  |
+  *  |                             |
+  *  +-----------------------------+
+  *
+  * pros - Reduces internal latency (when publish is received by the same ESP)
+  *      - Reduces wifi traffic
+  *      - No need to have an external broker
+  *      - can still report to a 'main' broker (TODO see documentation that have to be written)
+  *      - accepts external clients
+  *      - MqttClassBinder allows to mix together many mqtt sources
+  *
+  * cons - Takes more memory (24 more bytes for the one MqttClassBinder<Class>
+  *      - a bit hard to understand
+  *
+  */
+
+const char *ssid     = "";
+const char *password = "";
+
+std::string topic_b="sensor/btemp";
+std::string topic_sender= "sensor/counter";
+
+MqttBroker broker(1883);
+
+MqttClient mqtt_a(&broker);
+MqttClient mqtt_b(&broker);
+MqttClient mqtt_sender(&broker);
+
+class MqttReceiver: public MqttClassBinder<MqttReceiver>
+{
+  public:
+
+    void onPublish(const MqttClient* source, const Topic& topic, const char* payload, size_t /* length */)
+    {
+      Serial
+        << "   * MqttReceiver received topic (" << topic.c_str() << ")"
+        << " from (" << source->id() << "), "
+        << " payload: (" << payload << ')' << endl;
+    }
+};
+
+void setup()
+{
+  Serial.begin(115200);
+  delay(500);
+  Serial << "Clients with wifi " << endl;
+
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    Serial << '-'; delay(500);
+  	if (strlen(ssid)==0)
+	  	Serial << "****** PLEASE EDIT THE EXAMPLE AND MODIFY ssid/password *************" << endl;
+  }
+
+  Serial << "Connected to " << ssid << "IP address: " << WiFi.localIP() << endl;
+
+  broker.begin();
+
+  MqttReceiver* receiver = new MqttReceiver;
+
+  // receiver will receive both publication from two MqttClient
+  // (that could be connected to two different brokers)
+  MqttClassBinder<MqttReceiver>::onPublish(&mqtt_a, receiver);
+  MqttClassBinder<MqttReceiver>::onPublish(&mqtt_b, receiver);
+
+  mqtt_a.id("mqtt_a");
+  mqtt_b.id("mqtt_b");
+  mqtt_sender.id("sender");
+
+  mqtt_a.subscribe(topic_b);
+  mqtt_b.subscribe(topic_sender);
+
+}
+
+void loop()
+{
+  broker.loop();  // Don't forget to add loop for every broker and clients
+
+  mqtt_a.loop();
+  mqtt_b.loop();
+  mqtt_sender.loop();
+
+  // ============= client A publish ================
+  {
+    static const int interval = 5000;  // publishes every 5s (please avoid usage of delay())
+    static uint32_t timer = millis() + interval;
+
+    if (millis() > timer)
+    {
+      static int counter = 0;
+      Serial << "Sender is publishing " << topic_sender.c_str() << endl;
+      timer += interval;
+      mqtt_sender.publish(topic_sender, "sent by Sender, message #"+std::string(String(counter++).c_str()));
+    }
+  }
+
+  // ============= client B publish ================
+  {
+    static const int interval = 7000;	// will send topic each 7s
+    static uint32_t timer = millis() + interval;
+    static int temperature;
+
+    if (millis() > timer)
+    {
+      Serial << "B is publishing " << topic_b.c_str() << endl;
+      timer += interval;
+      mqtt_b.publish(topic_b, "sent by B: temp="+std::string(String(16+temperature++%6).c_str()));
+    }
+  }
+}

examples/simple-broker/simple-broker.ino

@@ -1,7 +1,9 @@
 #include "TinyMqtt.h"   // https://github.com/hsaturn/TinyMqtt
 
-#define PORT 1883
+const uint16_t PORT 1883;
-MqttBroker broker(PORT);
+const uint8_t  RETAIN = 10;  // Max retained messages
+
+MqttBroker broker(PORT, RETAIN);
 
 /** Basic Mqtt Broker
   *
@@ -16,6 +18,8 @@ MqttBroker broker(PORT);
   *  Your ESP will become a MqttBroker.
 	*  You can test it with any client such as mqtt-spy for example
 	*
+	* Messages are retained *only* if retain > 0
+	*
   */
 
 const char* ssid = "";
@@ -26,7 +30,7 @@ void setup()
   Serial.begin(115200);
 
 	if (strlen(ssid)==0)
-		Serial << "****** PLEASE MODIFY ssid/password *************" << endl;
+		Console << TinyConsole::red << "****** PLEASE MODIFY ssid/password *************" << endl;
 
   WiFi.mode(WIFI_STA);
   WiFi.begin(ssid, password);
@@ -35,10 +39,10 @@ void setup()
     Serial << '.';
     delay(500);
   }
-  Serial << "Connected to " << ssid << "IP address: " << WiFi.localIP() << endl;  
+  Console << TinyConsole::green << "Connected to " << ssid << "IP address: " << WiFi.localIP() << endl;
 
   broker.begin();
-  Serial << "Broker ready : " << WiFi.localIP() << " on port " << PORT << endl;
+  Console << "Broker ready : " << WiFi.localIP() << " on port " << PORT << endl;
 }
 
 void loop()

examples/simple-client/simple-client.ino

@@ -1,6 +1,7 @@
 #include "TinyMqtt.h"    // https://github.com/hsaturn/TinyMqtt
+#include "TinyStreaming.h" // https://github.com/hsaturn/TinyConsole
 
-/** Simple Client (The simplest configuration)
+/** Simple Client (The simplest configuration, client only sends topics)
   *
   *
   *                   +--------+
@@ -55,7 +56,7 @@ void setup()
 
   Serial << "Connected to " << ssid << "IP address: " << WiFi.localIP() << endl;
 
-	client.connect(BROKER, BROKER_PORT);	// Put here your broker ip / port
+	client.connect(BROKER, BROKER_PORT);
 }
 
 void loop()

library.json

@@ -0,0 +1,20 @@
+{
+    "name": "TinyMqtt",
+    "keywords": [ "ethernet, mqtt, m2m, iot" ],
+    "description": "A lightweight MQTT library for ESP8266 and ESP32, supporting MQTT 3.1.1 with QoS and allowing to create a Mqtt broker",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/hsaturn/TinyMqtt.git"
+    },
+    "dependencies":
+    { "hsaturn/TinyConsole" : "*" },
+    "version": "1.1.4",
+    "exclude": "",
+    "examples": "examples/*/*.ino",
+    "frameworks": "arduino",
+    "platforms": [
+        "atmelavr",
+        "espressif8266",
+        "espressif32"
+    ]
+}

library.json.skeleton

@@ -0,0 +1,20 @@
+{
+    "name": "#name",
+    "keywords": [ "ethernet, mqtt, m2m, iot" ],
+    "description": "#paragraph",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/hsaturn/TinyMqtt.git"
+    },
+    "dependencies":
+    { #dependencies },
+    "version": "#version",
+    "exclude": "",
+    "examples": "examples/*/*.ino",
+    "frameworks": "arduino",
+    "platforms": [
+        "atmelavr",
+        "espressif8266",
+        "espressif32"
+    ]
+}

library.properties

@@ -1,10 +1,11 @@
 name=TinyMqtt
-version=0.9.3
+version=1.1.4
 author=Francois BIOT, HSaturn, <hsaturn@gmail.com>
-maintainer=Francois BIOT, HSaturn, <hsaturn@gmail.com>
+maintainer=Francois BIOT <hsaturn@gmail.com>
 sentence=A tiny broker and client library for MQTT messaging.
-paragraph=MQTT is a lightweight messaging protocol ideal for small devices. This library allows to send and receive MQTT messages and to host a broker in your ESP 8266 and 32 WROOM. It does support MQTT 3.1.1 with QoS=0.
+paragraph=A lightweight MQTT library for ESP8266 and ESP32, supporting MQTT 3.1.1 with QoS and allowing to create a Mqtt broker
 category=Communication
 url=https://github.com/hsaturn/TinyMqtt
 architectures=*
+depends=hsaturn/TinyConsole
 includes=TinyMqtt.h

src/MqttClassBinder.h

@@ -0,0 +1,72 @@
+// MqttReceiver must implement onPublish(...)
+template <class MqttReceiver>
+class MqttClassBinder
+{
+  public:
+    MqttClassBinder()
+    {
+      unregister(this);
+    }
+    ~MqttClassBinder() { unregister(this); }
+
+    static void onUnpublished(MqttClient::CallBack handler)
+    {
+      unrouted_handler = handler;
+    }
+
+    static void onPublish(MqttClient* client, MqttReceiver* dest)
+    {
+      routes.insert(std::pair<MqttClient*, MqttReceiver*>(client, dest));
+      client->setCallback(onRoutePublish);
+    }
+
+    void onPublish(const MqttClient* client, const Topic& topic, const char* payload, size_t length)
+    {
+      static_cast<MqttReceiver*>(this)->MqttReceiver::onPublish(client, topic, payload, length);
+    }
+
+    static size_t size() { return routes.size(); }
+
+    static void reset() { routes.clear(); }
+
+  private:
+
+    static void onRoutePublish(const MqttClient* client, const Topic& topic, const char* payload, size_t length)
+    {
+      bool unrouted = true;
+      auto receivers = routes.equal_range(client);
+      for(auto it = receivers.first; it != receivers.second; ++it)
+      {
+        it->second->onPublish(client, topic, payload, length);
+        unrouted = false;
+      }
+
+      if (unrouted and unrouted_handler)
+      {
+        unrouted_handler(client, topic, payload, length);
+      }
+    }
+
+  private:
+    void unregister(MqttClassBinder<MqttReceiver>* which)
+    {
+      if (routes.size()==0) return;   // bug in map stl
+      for(auto it=routes.begin(); it!=routes.end(); it++)
+        if (it->second == which)
+        {
+          routes.erase(it);
+          return;
+        }
+    }
+
+  static std::multimap<const MqttClient*, MqttClassBinder<MqttReceiver>*> routes;
+  static MqttClient::CallBack unrouted_handler;
+
+};
+
+template<class MqttReceiver>
+std::multimap<const MqttClient*, MqttClassBinder<MqttReceiver>*> MqttClassBinder<MqttReceiver>::routes;
+
+template<class MqttReceiver>
+MqttClient::CallBack MqttClassBinder<MqttReceiver>::unrouted_handler = nullptr;
+

src/MqttStreaming.h

@@ -1,413 +0,0 @@
-/* MqttStreaming.h - Fork of Streaming.h adding std::string and with some minor fixes
- * (I have to speek to the author in order to include my changes to his library if possible)
- **/
-
-/*
-  Streaming.h - Arduino library for supporting the << streaming operator
-  Copyright (c) 2010-2012 Mikal Hart.  All rights reserved.
-
-  This library is free software; you can redistribute it and/or
-  modify it under the terms of the GNU Lesser General Public
-  License as published by the Free Software Foundation; either
-  version 2.1 of the License, or (at your option) any later version.
-
-  This library is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-*/
-
-/*
-  Version 6 library changes
-    Copyright (c) 2019 Gazoodle. All rights reserved.
-
-  1.  _BASED moved to template to remove type conversion to long and
-      sign changes which break int8_t and int16_t negative numbers. 
-      The print implementation still upscales to long for it's internal
-      print routine.
-
-  2.  _PAD added to allow padding & filling of characters to the stream
-
-  3.  _WIDTH & _WIDTHZ added to allow width printing with space padding
-      and zero padding for numerics
-
-  4.  Simple _FMT mechanism ala printf, but without the typeunsafetyness 
-      and no internal buffers for replaceable stream printing
-*/
-#pragma once
-
-#ifndef ARDUINO_STREAMING
-#define ARDUINO_STREAMING
-
-#if (defined(ARDUINO) && ARDUINO >= 100) || defined(EPOXY_DUINO)
-#include "Arduino.h"
-#else
-#ifndef STREAMING_CONSOLE
-#include "WProgram.h"
-#endif
-#endif
-
-#include <string>
-
-#if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR)
-// No stl library, so need trivial version of std::is_signed ...
-namespace std {
-template<typename T>
-  struct is_signed { static const bool value = false; };
-  template<>
-  struct is_signed<int8_t> { static const bool value = true; };
-  template<>
-  struct is_signed<int16_t> { static const bool value = true; };
-  template<>
-  struct is_signed<int32_t> { static const bool value = true; };
-};
-#else
-#include <type_traits>
-#endif
-
-#define STREAMING_LIBRARY_VERSION 6
-
-#if !defined(typeof)
-#define typeof(x) __typeof__(x)
-#endif
-
-// PrintBuffer implementation of Print, a small buffer to print in
-// see its use with pad_float()
-template <size_t N>
-class PrintBuffer : public Print
-{
-  size_t  pos = 0;
-  char    str[N] {};
-public:
-  inline const char *operator() () 
-  { return str; };
-  
-  // inline void clear() 
-  // { pos = 0; str[0] = '\0'; };
-  
-  inline size_t write(uint8_t c) 
-  { return write(&c, 1); };
-  
-  inline size_t write(const uint8_t *buffer, size_t size)
-  {
-    size_t s = std::min(size, N-1 - pos); // need a /0 left
-    if (s)
-    {
-      memcpy(&str[pos], buffer, s);
-      pos += s;
-    }
-    return s;
-  };
-};
-
-// Generic template
-template<class T>
-inline Print &operator <<(Print &stream, const T &arg)
-{ stream.print(arg); return stream; }
-
-// TODO sfinae maybe could do the trick ?
-inline Print &operator <<(Print &stream, const std::string &str)
-{ stream.print(str.c_str()); return stream; }
-
-template<typename T>
-struct _BASED
-{
-  T val;
-  int base;
-  _BASED(T v, int b): val(v), base(b)
-  {}
-};
-
-#if ARDUINO >= 100
-
-struct _BYTE_CODE
-{
-  byte val;
-  _BYTE_CODE(byte v) : val(v)
-  {}
-};
-#define _BYTE(a)    _BYTE_CODE(a)
-
-inline Print &operator <<(Print &obj, const _BYTE_CODE &arg)
-{ obj.write(arg.val); return obj; }
-
-#else
-
-#define _BYTE(a)    _BASED<typeof(a)>(a, BYTE)
-
-#endif
-
-#define _HEX(a)     _BASED<typeof(a)>(a, HEX)
-#define _DEC(a)     _BASED<typeof(a)>(a, DEC)
-#define _OCT(a)     _BASED<typeof(a)>(a, OCT)
-#define _BIN(a)     _BASED<typeof(a)>(a, BIN)
-
-// Specialization for class _BASED
-// Thanks to Arduino forum user Ben Combee who suggested this
-// clever technique to allow for expressions like
-//   Serial << _HEX(a);
-
-template<typename T>
-inline Print &operator <<(Print &obj, const _BASED<T> &arg)
-{ obj.print(arg.val, arg.base); return obj; }
-
-#if ARDUINO >= 18 || defined(EPOXY_DUINO)
-// Specialization for class _FLOAT
-// Thanks to Michael Margolis for suggesting a way
-// to accommodate Arduino 0018's floating point precision
-// feature like this:
-//   Serial << _FLOAT(gps_latitude, 6); // 6 digits of precision
-
-struct _FLOAT
-{
-  double val; // only Print::print(double)
-  int digits;
-  _FLOAT(double v, int d): val(v), digits(d)
-  {}
-};
-
-inline Print &operator <<(Print &obj, const _FLOAT &arg)
-{ obj.print(arg.val, arg.digits); return obj; }
-#endif
-
-// Specialization for enum _EndLineCode
-// Thanks to Arduino forum user Paul V. who suggested this
-// clever technique to allow for expressions like
-//   Serial << "Hello!" << endl;
-
-enum _EndLineCode { endl };
-
-inline Print &operator <<(Print &obj, _EndLineCode)
-{ obj.println(); return obj; }
-
-// Specialization for padding & filling, mainly utilized
-// by the width printers
-//
-//  Use like 
-//    Serial << _PAD(10,' ');   // Will output 10 spaces
-//    Serial << _PAD(4, '0');   // Will output 4 zeros
-struct _PAD
-{
-  int8_t width;
-  char   chr;
-  _PAD(int8_t w, char c) : width(w), chr(c) {}
-};
-
-inline Print &operator <<(Print& stm, const _PAD &arg)
-{
-  for(int8_t i = 0; i < arg.width; i++)
-    stm.print(arg.chr);
-  return stm;
-}
-
-// Specialization for width printing
-//
-//    Use like                            Result
-//    --------                            ------
-//    Serial << _WIDTH(1,5)               "    1"
-//    Serial << _WIDTH(10,5)              "   10"
-//    Serial << _WIDTH(100,5)             "  100"
-//    Serial << _WIDTHZ(1,5)              "00001"
-//
-//  Great for times & dates, or hex dumps
-//
-//    Serial << _WIDTHZ(hour,2) << ':' << _WIDTHZ(min,2) << ':' << _WIDTHZ(sec,2)
-//
-//    for(int index=0; index<byte_array_size; index++)
-//      Serial << _WIDTHZ(_HEX(byte_array[index]))
-
-template<typename T>
-struct __WIDTH
-{
-  const T val;
-  int8_t width;
-  char pad;
-  __WIDTH(const T& v, int8_t w, char p) : val(v), width(w), pad(p) {}
-};
-
-//  Count digits in an integer of specific base
-template<typename T>
-inline uint8_t digits(T v, int8_t base = 10)
-{
-  uint8_t digits = 0;
-  if ( std::is_signed<T>::value )
-  {
-    if ( v < 0 )
-    {
-      digits++;
-      v = -v; // v needs to be postive for the digits counter to work
-    }
-  }
-  do
-  {
-    v /= base;
-    digits++;
-  } while( v > 0 );
-  return digits;
-}
-
-// Generic get the width of a value in base 10
-template<typename T>
-inline uint8_t get_value_width(T val)
-{ return digits(val); }
-
-inline uint8_t get_value_width(const char * val)
-{ return strlen(val); }
-
-#ifdef ARDUINO
-inline uint8_t get_value_width(const __FlashStringHelper * val)
-{ return strlen_P(reinterpret_cast<const char *>(val)); }
-#endif
-
-// _BASED<T> get the width of a value
-template<typename T>
-inline uint8_t get_value_width(_BASED<T> b)
-{ return digits(b.val, b.base); }
-
-// Constructor wrapper to allow automatic template parameter deduction
-template<typename T>
-__WIDTH<T> _WIDTH(T val, int8_t width) { return __WIDTH<T>(val, width, ' '); }
-template<typename T>
-__WIDTH<T> _WIDTHZ(T val, int8_t width) { return __WIDTH<T>(val, width, '0'); }
-
-
-// Operator overload to handle width printing.
-template<typename T>
-inline Print &operator <<(Print &stm, const __WIDTH<T> &arg)
-{ stm << _PAD(arg.width - get_value_width(arg.val), arg.pad) << arg.val; return stm; }
-
-// explicit Operator overload to handle width printing of _FLOAT, double and float
-template<typename T>
-inline Print &pad_float(Print &stm, const __WIDTH<T> &arg, const double val, const int digits = 2) // see Print::print(double, int = 2)
-{
-  PrintBuffer<32> buf; // it's only ~45B on the stack, no allocation, leak or fragmentation
-  size_t size = buf.print(val, digits); // print in buf
-  return stm << _PAD(arg.width - size, arg.pad) << buf(); // pad and concat what's in buf
-}
-
-inline Print &operator <<(Print &stm, const __WIDTH<float>  &arg) 
-{ return pad_float(stm, arg, arg.val); }
-
-inline Print &operator <<(Print &stm, const __WIDTH<double> &arg) 
-{ return pad_float(stm, arg, arg.val); } 
-
-inline Print &operator <<(Print &stm, const __WIDTH<_FLOAT> &arg) 
-{ auto& f = arg.val; return pad_float(stm, arg, f.val, f.digits); }
-
-// a less verbose _FLOATW for _WIDTH(_FLOAT)
-#define _FLOATW(val, digits, width) _WIDTH<_FLOAT>(_FLOAT((val), (digits)), (width))
-
-// Specialization for replacement formatting
-//
-//  Designed to be similar to printf that everyone knows and loves/hates. But without
-//  the internal buffers and type agnosticism. This version only has placeholders in
-//  the format string, the actual values are supplied using the stream safe operators
-//  defined in this library.
-//
-//  Use like this:
-//
-//      Serial << FMT(F("Replace % with %"), 1, 2 )
-//      Serial << FMT("Time is %:%:%", _WIDTHZ(hours,2), _WIDTHZ(minutes,2), _WIDTHZ(seconds,2))
-//      Serial << FMT("Your score is %\\%", score);   // Note the \\ to escape the % sign
-
-// Ok, hold your hats. This is a foray into C++11's variadic template engine ...
-
-inline char get_next_format_char(const char *& format_string)
-{
-  char format_char = *format_string;
-  if ( format_char > 0 ) format_string++;
-  return format_char;
-}
-
-#ifdef ARDUINO
-inline char get_next_format_char(const __FlashStringHelper*& format_string)
-{
-  char format_char = pgm_read_byte(format_string);
-  if ( format_char > 0 ) format_string = reinterpret_cast<const __FlashStringHelper*>(reinterpret_cast<const char *>(format_string)+1);
-  return format_char;
-}
-#endif
-
-template<typename Ft>
-inline bool check_backslash(char& format_char, Ft& format_string)
-{
-  if ( format_char == '\\')
-  {
-    format_char = get_next_format_char(format_string);
-    return true;
-  }
-  return false;
-}
-
-// The template tail printer helper
-template<typename Ft, typename... Ts>
-struct __FMT
-{
-  Ft format_string;
-  __FMT(Ft f, Ts ... args) : format_string(f) {}
-  inline void tstreamf(Print& stm, Ft format) const
-  {
-    while(char c = get_next_format_char(format))
-    {
-      check_backslash(c, format);
-      if ( c )
-        stm.print(c);
-    }
-  }
-};
-
-// The variadic template helper
-template<typename Ft, typename T, typename... Ts>
-struct __FMT<Ft, T, Ts...> : __FMT<Ft, Ts...>
-{
-  T val;
-  __FMT(Ft f, T t, Ts... ts) : __FMT<Ft, Ts...>(f, ts...), val(t) {}
-  inline void tstreamf(Print& stm, Ft format) const
-  {
-    while(char c = get_next_format_char(format))
-    {
-      if (!check_backslash(c, format))
-      {
-        if ( c == '%')
-        {
-          stm << val;
-          // Variadic recursion ... compiler rolls this out during 
-          // template argument pack expansion
-          __FMT<Ft, Ts...>::tstreamf(stm, format);
-          return;
-        }
-      }
-      if (c)
-        stm.print(c);
-    }
-  }
-};
-
-// The actual operator should you only instanciate the FMT 
-// helper with a format string and no parameters
-template<typename Ft, typename... Ts>
-inline Print& operator <<(Print &stm, const __FMT<Ft, Ts...> &args)
-{
-    args.tstreamf(stm, args.format_string);
-    return stm;
-}
-
-// The variadic stream helper
-template<typename Ft, typename T, typename... Ts>
-inline Print& operator <<(Print &stm, const __FMT<Ft, T, Ts...> &args)
-{
-    args.tstreamf(stm, args.format_string);
-    return stm;
-}
-
-// As we don't have C++17, we can't get a constructor to use
-// automatic argument deduction, but ... this little trick gets
-// around that ...
-template<typename Ft, typename... Ts>
-__FMT<Ft, Ts...> _FMT(Ft format, Ts ... args) { return __FMT<Ft, Ts...>(format, args...); }
-
-#endif

src/StringIndexer.cpp

@@ -1,3 +1,4 @@
 #include "StringIndexer.h"
 
-std::map<StringIndexer::index_t, StringIndexer::StringCounter> StringIndexer::strings;
+StringIndexer::Strings StringIndexer::strings;
+

src/StringIndexer.h

@@ -1,17 +1,25 @@
+// vim: ts=2 sw=2 expandtab
 #pragma once
+#include <assert.h>
 #include <map>
+#include <unordered_map>
+#include "TinyConsole.h"
 #include <string>
 #include <string.h>
 
+using string = TinyConsole::string;
+
 /***
  * Allows to store up to 255 different strings with one byte class
  * very memory efficient when one string is used many times.
  */
 class StringIndexer
 {
+  private:
+
   class StringCounter
   {
-    std::string str;
+    string str;
     uint8_t used=0;
     friend class StringIndexer;
 
@@ -28,9 +36,9 @@ class StringIndexer
   public:
     using index_t = uint8_t;
 
-   static const std::string& str(const index_t& index)
+   static const string& str(const index_t& index)
    {
-      static std::string dummy;
+     static string dummy;
      const auto& it=strings.find(index);
      if (it == strings.end()) return dummy;
      return it->second.str;
@@ -76,7 +84,7 @@ class StringIndexer
       {
         if (strings.find(index)==strings.end())
         {
-          strings[index].str = std::string(str, len);
+          strings[index].str = string(str, len);
           strings[index].used++;
           // Serial << "Creating index " << index << " for (" << strings[index].str.c_str() << ") len=" << len << endl;
           return index;
@@ -85,7 +93,9 @@ class StringIndexer
       return 0;  // TODO out of indexes
     }
 
-    static std::map<index_t, StringCounter> strings;
+    using Strings = std::unordered_map<index_t, StringCounter>;
+
+    static Strings strings;
 };
 
 class IndexedString
@@ -97,12 +107,14 @@ class IndexedString
       index = source.index;
     }
 
+    IndexedString(IndexedString&& i) : index(i.index) {}
+
     IndexedString(const char* str, uint8_t len)
     {
       index=StringIndexer::strToIndex(str, len);
     }
 
-    IndexedString(const std::string& str) : IndexedString(str.c_str(), str.length()) {};
+    IndexedString(const string& str) : IndexedString(str.c_str(), str.length()) {};
 
     ~IndexedString() { StringIndexer::release(index); }
 
@@ -123,7 +135,7 @@ class IndexedString
       return i1.index == i2.index;
     }
 
-    const std::string& str() const { return StringIndexer::str(index); }
+    const string& str() const { return StringIndexer::str(index); }
 
     const StringIndexer::index_t& getIndex() const { return index; }
 

src/TinyMqtt.cpp

@@ -1,122 +1,183 @@
+// vim: ts=2 sw=2 expandtab
 #include "TinyMqtt.h"
 #include <sstream>
 
-#ifdef EPOXY_DUINO
+#if TINY_MQTT_DEBUG
-  std::map<MqttMessage::Type, int> MqttClient::counters;
+static auto cyan = TinyConsole::cyan;
+static auto white = TinyConsole::white;
+static auto red = TinyConsole::red;
+static auto yellow = TinyConsole::yellow;
+
+int TinyMqtt::debug=2;
+
 #endif
 
-MqttBroker::MqttBroker(uint16_t port)
+#ifdef EPOXY_DUINO
+  std::map<MqttMessage::Type, int> MqttClient::counters;
+  int MqttBroker::instances = 0;
+  int MqttClient::instances = 0;
+
+#endif
+
+MqttBroker::MqttBroker(uint16_t port, uint8_t max_retain_size)
 {
+  debug("New broker" << port);
+  retain_size = max_retain_size;
   server = new TcpServer(port);
 #ifdef TINY_MQTT_ASYNC
   server->onClient(onClient, this);
 #endif
+#ifdef EPOXY_DUINO
+  instances++;
+#endif
 }
 
 MqttBroker::~MqttBroker()
 {
+#ifdef EPOXY_DUINO
+  instances--;
+#endif
+  closeRemoteBroker();
   while(clients.size())
   {
-    delete clients[0];
+    auto client = clients[0];
+    client->local_broker = nullptr;
+    if (client->cltFlags & MqttClient::CltFlags::CltFlagToDelete)
+    {
+      // std::cout << "Deleting client" << std::endl;
+      delete client;
+    }
+    clients.erase(clients.begin());
   }
   delete server;
 }
 
 // private constructor used by broker only
-MqttClient::MqttClient(MqttBroker* parent, TcpClient* new_client)
+MqttClient::MqttClient(MqttBroker* local_broker, TcpClient* new_client)
-  : parent(parent)
+  : local_broker(local_broker)
 {
+  debug("MqttClient private with broker");
 #ifdef TINY_MQTT_ASYNC
-  client = new_client;
+  tcp_client = new_client;
-  client->onData(onData, this);
+  tcp_client->onData(onData, this);
   // client->onConnect() TODO
   // client->onDisconnect() TODO
 #else
-  client = new WiFiClient(*new_client);
+  tcp_client = new TcpClient(*new_client);
 #endif
 #ifdef EPOXY_DUINO
   alive = millis()+500000;
+  instances++;
 #else
   alive = millis()+5000;  // TODO MAGIC client expires after 5s if no CONNECT msg
 #endif
 }
 
-MqttClient::MqttClient(MqttBroker* parent, const std::string& id)
+MqttClient::MqttClient(MqttBroker* local_broker, const string& id)
-  : parent(parent), clientId(id)
+  : local_broker(local_broker), clientId(id)
 {
-    client = nullptr;
+  alive = 0;
+  keep_alive = 0;
 
-    if (parent) parent->addClient(this);
+  if (local_broker) local_broker->addClient(this);
+#ifdef EPOXY_DUINO
+  instances++;
+#endif
 }
 
 MqttClient::~MqttClient()
 {
+#ifdef EPOXY_DUINO
+  instances--;
+#endif
   close();
-  delete client;
+  delete tcp_client;
+  debug("*** MqttClient delete()");
 }
 
 void MqttClient::close(bool bSendDisconnect)
 {
   debug("close " << id().c_str());
-  mqtt_connected = false;
+  resetFlag(CltFlagConnected);
-  if (client)  // connected to a remote broker
+  if (tcp_client)  // connected to a remote broker
   {
-    if (bSendDisconnect and client->connected())
+    if (bSendDisconnect and tcp_client->connected())
     {
       message.create(MqttMessage::Type::Disconnect);
+      message.hexdump("close");
       message.sendTo(this);
     }
-    client->stop();
+    tcp_client->stop();
   }
 
-  if (parent)
+  if (local_broker)
   {
-    parent->removeClient(this);
+    local_broker->removeClient(this);
-    parent = nullptr;
+    local_broker = nullptr;
   }
 }
 
-void MqttClient::connect(MqttBroker* parentBroker)
+void MqttClient::connect(MqttBroker* local)
 {
+  debug("MqttClient::connect_local");
   close();
-  parent = parentBroker;
+  local_broker = local;
+  local_broker->addClient(this);
 }
 
-void MqttClient::connect(std::string broker, uint16_t port, uint16_t ka)
+void MqttClient::connect(string broker, uint16_t port, uint16_t ka)
 {
-  debug("MqttClient::connect");
+  debug("MqttClient::connect_to_host " << broker << ':' << port);
   keep_alive = ka;
   close();
-  if (client) delete client;
+  if (tcp_client) delete tcp_client;
-  client = new TcpClient;
+  tcp_client = new TcpClient;
 
-  debug("Trying to connect to " << broker.c_str() << ':' << port);
 #ifdef TINY_MQTT_ASYNC
-  client->onData(onData, this);
+  tcp_client->onData(onData, this);
-  client->onConnect(onConnect, this);
+  tcp_client->onConnect(onConnect, this);
-  client->connect(broker.c_str(), port);
+  tcp_client->connect(broker.c_str(), port);
 #else
-  if (client->connect(broker.c_str(), port))
+  if (tcp_client->connect(broker.c_str(), port))
   {
-    onConnect(this, client);
+    debug("link established");
+    onConnect(this, tcp_client);
+  }
+  else
+  {
+    debug("unable to connect.");
   }
 #endif
 }
 
 void MqttBroker::addClient(MqttClient* client)
 {
+  debug("MqttBroker::addClient");
   clients.push_back(client);
 }
 
-void MqttBroker::connect(const std::string& host, uint16_t port)
+void MqttBroker::closeRemoteBroker()
 {
-  if (broker == nullptr) broker = new MqttClient;
+  if (remote_broker)
-  broker->connect(host, port);
+  {
-  broker->parent = this;  // Because connect removed the link
+    delete remote_broker;
+    remote_broker = nullptr;
+  }
+}
+
+void MqttBroker::connect(const string& host, uint16_t port)
+{
+  debug("MqttBroker::connect");
+  closeRemoteBroker();
+  if (remote_broker == nullptr) remote_broker = new MqttClient;
+  remote_broker->connect(host, port);
+  remote_broker->local_broker = this;  // Because connect removed the link
+  // TODO shouldn't we resubscribe to all client subscriptions ?
 }
 
 void MqttBroker::removeClient(MqttClient* remove)
 {
+  debug("removeClient");
   for(auto it=clients.begin(); it!=clients.end(); it++)
   {
     auto client=*it;
@@ -133,47 +194,47 @@ void MqttBroker::removeClient(MqttClient* remove)
       return;
     }
   }
-  debug("Error cannot remove client");  // TODO should not occur
+  debug(red << "Error cannot remove client");  // TODO should not occur
 }
 
 void MqttBroker::onClient(void* broker_ptr, TcpClient* client)
 {
+  debug("MqttBroker::onClient");
   MqttBroker* broker = static_cast<MqttBroker*>(broker_ptr);
 
-  broker->addClient(new MqttClient(broker, client));
+  MqttClient* mqtt = new MqttClient(broker, client);
+  mqtt->setFlag(MqttClient::CltFlags::CltFlagToDelete);
+  broker->addClient(mqtt);
   debug("New client");
 }
 
 void MqttBroker::loop()
 {
 #ifndef TINY_MQTT_ASYNC
-  WiFiClient client = server->available();
+  TcpClient client = server->accept();
 
   if (client)
   {
     onClient(this, &client);
   }
 #endif
-  if (broker)
+  if (remote_broker)
   {
     // TODO should monitor broker's activity.
     // 1 When broker disconnect and reconnect we have to re-subscribe
-    broker->loop();
+    remote_broker->loop();
   }
 
-
-  // for(auto it=clients.begin(); it!=clients.end(); it++)
-  // use index because size can change during the loop
   for(size_t i=0; i<clients.size(); i++)
   {
-    auto client = clients[i];
+    MqttClient* client = clients[i];
     if (client->connected())
     {
       client->loop();
     }
     else
     {
-      debug("Client " << client->id().c_str() << "  Disconnected, parent=" << (dbg_ptr)client->parent);
+      debug("Client " << client->id().c_str() << "  Disconnected, local_broker=" << (dbg_ptr)client->local_broker);
       // Note: deleting a client not added by the broker itself will probably crash later.
       delete client;
       break;
@@ -181,38 +242,53 @@ void MqttBroker::loop()
   }
 }
 
-MqttError MqttBroker::subscribe(const Topic& topic, uint8_t qos)
+// Obvioulsy called when the broker is connected to another broker.
+MqttError MqttBroker::subscribe(MqttClient* client, const Topic& topic, uint8_t qos)
 {
-  if (broker && broker->connected())
+  debug("MqttBroker::subscribe to " << topic.str() << ", retained=" << retained.size() );
+  for(auto& retainItem: retained)
   {
-    return broker->subscribe(topic, qos);
+    auto &retained_topic = retainItem.first;
+    auto &retain = retainItem.second;
+    debug("  retained: " << retained_topic.str());
+    if (topic.matches(retained_topic))
+    {
+      debug("  -> sending");
+      client->publishIfSubscribed(retained_topic, retain.msg);
+    }
+  }
+  if (remote_broker && remote_broker->connected())
+  {
+    return remote_broker->subscribe(topic, qos);
   }
   return MqttNowhereToSend;
 }
 
-MqttError MqttBroker::publish(const MqttClient* source, const Topic& topic, MqttMessage& msg) const
+MqttError MqttBroker::publish(const MqttClient* source, const Topic& topic, MqttMessage& msg)
 {
   MqttError retval = MqttOk;
 
-  debug("publish ");
+  retain(topic, msg);
+
+  debug("MqttBroker::publish");
   int i=0;
   for(auto client: clients)
   {
     i++;
-#ifdef TINY_MQTT_DEBUG
+#if TINY_MQTT_DEBUG
-    Serial << "brk_" << (broker && broker->connected() ? "con" : "dis") <<
+    Console << __LINE__ << " broker:" << (remote_broker && remote_broker->connected() ? "linked" : "alone") <<
        "  srce=" << (source->isLocal() ? "loc" : "rem") << " clt#" << i << ", local=" << client->isLocal() << ", con=" << client->connected() << endl;
 #endif
     bool doit = false;
-    if (broker && broker->connected())  // this (MqttBroker) is connected (to a external broker)
+    if (remote_broker && remote_broker->connected())  // this (MqttBroker) is connected (to a external broker)
     {
       // ext_broker -> clients or clients -> ext_broker
-      if (source == broker)  // external broker -> internal clients
+      if (source == remote_broker)  // external broker -> internal clients
         doit = true;
       else                  // external clients -> this broker
       {
         // As this broker is connected to another broker, simply forward the msg
-        MqttError ret = broker->publishIfSubscribed(topic, msg);
+        MqttError ret = remote_broker->publishIfSubscribed(topic, msg);
         if (ret != MqttOk) retval = ret;
       }
     }
@@ -220,8 +296,8 @@ MqttError MqttBroker::publish(const MqttClient* source, const Topic& topic, Mqtt
     {
       doit = true;
     }
-#ifdef TINY_MQTT_DEBUG
+#if TINY_MQTT_DEBUG
-    Serial << ", doit=" << doit << ' ';
+    Console << ", doit=" << doit << ' ';
 #endif
 
     if (doit) retval = client->publishIfSubscribed(topic, msg);
@@ -242,16 +318,17 @@ bool MqttBroker::compareString(
 
 void MqttMessage::getString(const char* &buff, uint16_t& len)
 {
-  len = (buff[0]<<8)|(buff[1]);
+  len = getSize(buff);
   buff+=2;
 }
 
 void MqttClient::clientAlive(uint32_t more_seconds)
 {
+  debug("MqttClient::clientAlive");
   if (keep_alive)
   {
 #ifdef EPOXY_DUINO
-    alive=millis()+500000;
+    alive=millis()+500000+0*more_seconds;
 #else
     alive=millis()+1000*(keep_alive+more_seconds);
 #endif
@@ -262,29 +339,30 @@ void MqttClient::clientAlive(uint32_t more_seconds)
 
 void MqttClient::loop()
 {
-  if (alive && (millis() > alive))
+  if (keep_alive && (millis() >= alive))
   {
-    if (parent)
+    if (tcp_client && tcp_client->connected())
-    {
-      debug("timeout client");
-      close();
-      debug("closed");
-    }
-    else if (client && client->connected())
     {
       debug("pingreq");
-      uint16_t pingreq = MqttMessage::Type::PingReq;
+      static MqttMessage pingreq(MqttMessage::Type::PingReq);
-      client->write((const char*)(&pingreq), 2);
+      pingreq.sendTo(this);
       clientAlive(0);
 
       // TODO when many MqttClient passes through a local broker
       // there is no need to send one PingReq per instance.
     }
-  }
+    else if (local_broker)
-#ifndef TINY_MQTT_ASYNC
-  while(client && client->available()>0)
     {
-    message.incoming(client->read());
+      debug(red << "timeout client");
+      close();
+      debug(red << "closed");
+    }
+  }
+
+#ifndef TINY_MQTT_ASYNC
+  while(tcp_client && tcp_client->available()>0)
+  {
+    message.incoming(tcp_client->read());
     if (message.type())
     {
       processMessage(&message);
@@ -297,19 +375,19 @@ void MqttClient::loop()
 void MqttClient::onConnect(void *mqttclient_ptr, TcpClient*)
 {
   MqttClient* mqtt = static_cast<MqttClient*>(mqttclient_ptr);
-  debug("cnx: connecting");
+  debug("MqttClient::onConnect");
   MqttMessage msg(MqttMessage::Type::Connect);
   msg.add("MQTT",4);
   msg.add(0x4);  // Mqtt protocol version 3.1.1
   msg.add(0x0);  // Connect flags         TODO user / name
 
-  msg.add(0x00);      // keep_alive
+  msg.add((char)(mqtt->keep_alive >> 8));   // keep_alive
-  msg.add((char)mqtt->keep_alive);
+  msg.add((char)(mqtt->keep_alive & 0xFF));
   msg.add(mqtt->clientId);
   debug("cnx: mqtt connecting");
   msg.sendTo(mqtt);
   msg.reset();
-  debug("cnx: mqtt sent " << (dbg_ptr)mqtt->parent);
+  debug("cnx: mqtt sent " << (dbg_ptr)mqtt->local_broker);
 
   mqtt->clientAlive(0);
 }
@@ -354,29 +432,30 @@ void MqttClient::resubscribe()
 
 MqttError MqttClient::subscribe(Topic topic, uint8_t qos)
 {
-  debug("subsribe(" << topic.c_str() << ")");
+  debug("MqttClient::subsribe(" << topic.c_str() << ")");
   MqttError ret = MqttOk;
 
   subscriptions.insert(topic);
 
-  if (parent==nullptr) // remote broker
+  if (local_broker==nullptr) // connected to a remote broker
   {
     return sendTopic(topic, MqttMessage::Type::Subscribe, qos);
   }
   else
   {
-    return parent->subscribe(topic, qos);
+    return local_broker->subscribe(this, topic, qos);
   }
   return ret;
 }
 
 MqttError MqttClient::unsubscribe(Topic topic)
 {
+  debug("MqttClient::unsubscribe");
   auto it=subscriptions.find(topic);
   if (it != subscriptions.end())
   {
     subscriptions.erase(it);
-    if (parent==nullptr) // remote broker
+    if (local_broker==nullptr) // remote broker
     {
       return sendTopic(topic, MqttMessage::Type::UnSubscribe, 0);
     }
@@ -386,6 +465,7 @@ MqttError MqttClient::unsubscribe(Topic topic)
 
 MqttError MqttClient::sendTopic(const Topic& topic, MqttMessage::Type type, uint8_t qos)
 {
+  debug("MqttClient::sendTopic");
   MqttMessage msg(type, 2);
 
   // TODO manage packet identifier
@@ -401,17 +481,8 @@ MqttError MqttClient::sendTopic(const Topic& topic, MqttMessage::Type type, uint
 
 void MqttClient::processMessage(MqttMessage* mesg)
 {
-#ifdef TINY_MQTT_DEBUG
+#if TINY_MQTT_DEBUG
-if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::Type::PingResp)
-{
-  #ifdef NOT_ESP_CORE
-    Serial << "---> INCOMING " << _HEX(mesg->type()) << " client(" << (dbg_ptr)client << ':' << clientId << ") mem=" << " ESP.getFreeHeap() "<< endl;
-  #else
-    Serial << "---> INCOMING " << _HEX(mesg->type()) << " client(" << (dbg_ptr)client << ':' << clientId << ") mem=" << ESP.getFreeHeap() << endl;
-  #endif
-  // mesg->hexdump("Incoming");
   mesg->hexdump("Incoming");
-}
 #endif
   auto header = mesg->getVHeader();
   const char* payload;
@@ -425,14 +496,14 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
   switch(mesg->type())
   {
     case MqttMessage::Type::Connect:
-      if (mqtt_connected)
+      if (mqtt_connected())
       {
         debug("already connected");
         break;
       }
       payload = header+10;
       mqtt_flags = header[7];
-      keep_alive = (header[8]<<8)|(header[9]);
+      keep_alive = MqttMessage::getSize(header+8);
       if (strncmp("MQTT", header+2,4))
       {
         debug("bad mqtt header");
@@ -440,13 +511,13 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
       }
       if (header[6]!=0x04)
       {
-        debug("unknown level");
+        debug("Unsupported MQTT version (" << (int) header[6] << "), only version=4 supported" << endl);
         break;  // Level 3.1.1
       }
 
       // ClientId
       mesg->getString(payload, len);
-      clientId = std::string(payload, len);
+      clientId = string(payload, len);
       payload += len;
 
       if (mqtt_flags & FlagWill)  // Will topic
@@ -461,21 +532,21 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
       if (mqtt_flags & FlagUserName)
       {
         mesg->getString(payload, len);
-        if (!parent->checkUser(payload, len)) break;
+        if (not local_broker->checkUser(payload, len)) break;
         payload += len;
       }
       if (mqtt_flags & FlagPassword)
       {
         mesg->getString(payload, len);
-        if (!parent->checkPassword(payload, len)) break;
+        if (not local_broker->checkPassword(payload, len)) break;
         payload += len;
       }
 
-      #ifdef TINY_MQTT_DEBUG
+      #if TINY_MQTT_DEBUG
-        Serial << "Connected client:" << clientId.c_str() << ", keep alive=" << keep_alive << '.' << endl;
+        Console << yellow << "Client " << clientId << " connected : keep alive=" << keep_alive << '.' << white << endl;
       #endif
       bclose = false;
-      mqtt_connected=true;
+      setFlag(CltFlagConnected);
       {
         MqttMessage msg(MqttMessage::Type::ConnAck);
         msg.add(0);  // Session present (not implemented)
@@ -485,14 +556,14 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
       break;
 
     case MqttMessage::Type::ConnAck:
-      mqtt_connected = true;
+      setFlag(CltFlagConnected);
       bclose = false;
       resubscribe();
       break;
 
     case MqttMessage::Type::SubAck:
     case MqttMessage::Type::PubAck:
-      if (!mqtt_connected) break;
+      if (not mqtt_connected()) break;
       // Ignore acks
       bclose = false;
       break;
@@ -503,31 +574,32 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
       break;
 
     case MqttMessage::Type::PingReq:
-      if (!mqtt_connected) break;
+      if (not mqtt_connected()) break;
-      if (client)
+      if (tcp_client)
       {
         uint16_t pingreq = MqttMessage::Type::PingResp;
-        client->write((const char*)(&pingreq), 2);
+        debug(cyan << "Ping response to client ");
+        tcp_client->write((const char*)(&pingreq), 2);
         bclose = false;
       }
       else
       {
-        debug("internal pingreq ?");
+        debug(red << "internal pingreq ?");
       }
       break;
 
     case MqttMessage::Type::Subscribe:
     case MqttMessage::Type::UnSubscribe:
       {
-        if (!mqtt_connected) break;
+        if (not mqtt_connected()) break;
         payload = header+2;
 
         debug("un/subscribe loop");
-        std::string qoss;
+        string qoss;
         while(payload < mesg->end())
         {
           mesg->getString(payload, len);  // Topic
-          debug( "  topic (" << std::string(payload, len) << ')');
+          debug( "  topic (" << string(payload, len) << ')');
           // subscribe(Topic(payload, len));
           Topic topic(payload, len);
 
@@ -542,7 +614,7 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
             }
             else
               qoss.push_back(qos);
-            subscriptions.insert(topic);
+            subscribe(topic);
           }
           else
           {
@@ -563,43 +635,60 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
       break;
 
     case MqttMessage::Type::UnSuback:
-      if (!mqtt_connected) break;
+      if (not mqtt_connected()) break;
       bclose = false;
       break;
 
     case MqttMessage::Type::Publish:
-      #ifdef TINY_MQTT_DEBUG
+      #if TINY_MQTT_DEBUG
-        Serial << "publish " << mqtt_connected << '/' << (long) client << endl;
+        Console << "publish " << mqtt_connected() << '/' << (long) tcp_client << endl;
       #endif
-      if (mqtt_connected or client == nullptr)
+      if (mqtt_connected() or tcp_client == nullptr)
       {
         uint8_t qos = mesg->flags();
+        qos = (qos / 2) & 3;
         payload = header;
         mesg->getString(payload, len);
         Topic published(payload, len);
         payload += len;
-        // Serial << "Received Publish (" << published.str().c_str() << ") size=" << (int)len
+        #if TINY_MQTT_DEBUG
-        // << '(' << std::string(payload, len).c_str() << ')'  << " msglen=" << mesg->length() << endl;
+          Console << "Received Publish (" << published.str().c_str() << ") size=" << (int)len << endl;
-        if (qos) payload+=2;  // ignore packet identifier if any
+        #endif
+
+        const char* ID;     // remove PublishID() to avoid misuse
+        if (qos) {
+          ID = payload;
+          payload+=2;  // ignore packet identifier if any
+        }
         len=mesg->end()-payload;
+        if (qos == 1)
+        {
+          MqttMessage msg(MqttMessage::Type::PubAck);
+          msg.add(ID[0]);  // MessageID high
+          msg.add(ID[1]);  // MessageID low
+          msg.sendTo(this);
+        }
         // TODO reset DUP
         // TODO reset RETAIN
 
-        if (parent==nullptr or client==nullptr)  // internal MqttClient receives publish
+        if (local_broker==nullptr or tcp_client==nullptr)  // internal MqttClient receives publish
         {
-          #ifdef TINY_MQTT_DEBUG
+          #if TINY_MQTT_DEBUG
-            Serial << (isSubscribedTo(published) ? "not" : "") << " subscribed.\n";
+            if (TinyMqtt::debug >= 2)
-            Serial << "has " << (callback ? "" : "no ") << " callback.\n";
+            {
+              Console << (isSubscribedTo(published) ? "not" : "") << " subscribed.\r\n";
+              Console << "has " << (callback ? "" : "no ") << " callback.\r\n";
+            }
           #endif
           if (callback and isSubscribedTo(published))
           {
-            callback(this, published, payload, len);  // TODO send the real payload
+            callback(this, published, payload, len);
           }
         }
-        else if (parent) // from outside to inside
+        else if (local_broker) // from outside to inside
         {
-          debug("publishing to parent");
+          debug("publishing to local_broker");
-          parent->publish(this, published, *mesg);
+          local_broker->publish(this, published, *mesg);
         }
         bclose = false;
       }
@@ -607,8 +696,8 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
 
     case MqttMessage::Type::Disconnect:
       // TODO should discard any will msg
-      if (!mqtt_connected) break;
+      if (not mqtt_connected()) break;
-      mqtt_connected = false;
+      resetFlag(CltFlagConnected);
       close(false);
       bclose=false;
       break;
@@ -619,17 +708,17 @@ if (mesg->type() != MqttMessage::Type::PingReq && mesg->type() != MqttMessage::T
   };
   if (bclose)
   {
-    #ifdef TINY_MQTT_DEBUG
+    #if TINY_MQTT_DEBUG
-      Serial << "*************** Error msg 0x" << _HEX(mesg->type());
+      Console << red << "*************** Error msg 0x" << _HEX(mesg->type());
       mesg->hexdump("-------ERROR ------");
       dump();
-      Serial << endl;
+      Console << white << endl;
     #endif
     close();
   }
   else
   {
-    clientAlive(parent ? 5 : 0);
+    clientAlive(local_broker ? 5 : 0);
   }
 }
 
@@ -697,18 +786,18 @@ bool Topic::matches(const Topic& topic) const
 
 
 // publish from local client
-MqttError MqttClient::publish(const Topic& topic, const char* payload, size_t pay_length)
+MqttError MqttClient::publish(const Topic& topic, const char* payload, size_t pay_length, bool retain)
 {
-  MqttMessage msg(MqttMessage::Publish);
+  MqttMessage msg(MqttMessage::Publish, retain ? 1 : 0);
   msg.add(topic);
   msg.add(payload, pay_length, false);
   msg.complete();
 
-  if (parent)
+  if (local_broker)
   {
-    return parent->publish(this, topic, msg);
+    return local_broker->publish(this, topic, msg);
   }
-  else if (client)
+  else if (tcp_client and connected())
     return msg.sendTo(this);
   else
     return MqttNowhereToSend;
@@ -719,17 +808,17 @@ MqttError MqttClient::publishIfSubscribed(const Topic& topic, MqttMessage& msg)
 {
   MqttError retval=MqttOk;
 
-  debug("mqttclient publish " << subscriptions.size());
+  debug("mqttclient publishIfSubscribed " << topic.c_str() << ' ' << subscriptions.size());
   if (isSubscribedTo(topic))
   {
-    if (client)
+    if (tcp_client)
       retval = msg.sendTo(this);
     else
     {
       processMessage(&msg);
 
-      #ifdef TINY_MQTT_DEBUG
+      #if TINY_MQTT_DEBUG
-        Serial << "Should call the callback ?\n";
+        Console << "Should call the callback ?\n";
       #endif
       // callback(this, topic, nullptr, 0);  // TODO Payload
     }
@@ -797,8 +886,8 @@ void MqttMessage::incoming(char in_byte)
       break;
     case Complete:
     default:
-      #ifdef TINY_MQTT_DEBUG
+      #if TINY_MQTT_DEBUG
-        Serial << "Spurious " << _HEX(in_byte) << endl;
+        Console << red << "Spurious " << _HEX(in_byte) << white << endl;
         hexdump("spurious");
       #endif
       reset();
@@ -824,6 +913,7 @@ void MqttMessage::add(const char* p, size_t len, bool addLength)
 
 void MqttMessage::encodeLength()
 {
+  debug("encodingLength");
   if (state != Complete)
   {
     int length = buffer.size()-3;  // 3 = 1 byte for header + 2 bytes for pre-reserved length field.
@@ -849,43 +939,103 @@ MqttError MqttMessage::sendTo(MqttClient* client)
 {
   if (buffer.size())
   {
-    debug("sending " << buffer.size() << " bytes");
+    debug(cyan << "sending " << buffer.size() << " bytes to " << client->id());
     encodeLength();
-    // hexdump("snd");
+    hexdump("Sending ");
     client->write(&buffer[0], buffer.size());
   }
   else
   {
-    debug("??? Invalid send");
+    debug(red << "??? Invalid send");
     return MqttInvalidMessage;
   }
   return MqttOk;
 }
 
+void MqttBroker::retainDrop()
+{
+  if (retained.size() >= retain_size)
+  {
+    std::map<Topic, Retain>::iterator oldest = retained.begin();
+    auto it = oldest;
+    while(++it != retained.end())
+    {
+      if (oldest->second.timestamp > it->second.timestamp)
+        oldest = it;
+    }
+    retained.erase(oldest);
+  }
+}
+
+void MqttBroker::retain(const Topic& topic, const MqttMessage& msg)
+{
+  debug("MqttBroker::retain msg_type=" << _HEX(msg.type()) << ", retain_size=" << retain_size);
+  if (retain_size==0 or msg.type() != MqttMessage::Publish) return;
+  if (msg.flags() & 1)  // flag RETAIN
+  {
+    debug("  retaining " << topic.str());
+    auto old = retained.find(topic);
+    if (old == retained.end())
+      retainDrop();
+    else
+      retained.erase(old);
+    // FIXME if payload size == 0 remove message from retained
+    Retain r(micros(), msg);
+    r.msg.retained();
+    retained.insert({ topic, std::move(r)});
+  }
+}
+
 void MqttMessage::hexdump(const char* prefix) const
 {
   (void)prefix;
-#ifdef TINY_MQTT_DEBUG
+#if TINY_MQTT_DEBUG
+  if (TinyMqtt::debug<2) return;
+  static std::map<Type, string> tts={
+    { Connect, "Connect" },
+    { ConnAck, "Connack" },
+    { Publish, "Publish" },
+    { PubAck,  "Puback" },
+    { Subscribe, "Subscribe" },
+    { SubAck,   "Suback" },
+    { UnSubscribe, "Unsubscribe" },
+    { UnSuback, "Unsuback" },
+    { PingReq, "Pingreq" },
+    { PingResp, "Pingresp" },
+    { Disconnect, "Disconnect" }
+  };
+  string t("Unknown");
+  Type typ=static_cast<Type>(buffer[0] & 0xF0);
+  if (tts.find(typ) != tts.end())
+    t=tts[typ];
+  Console.fg(cyan);
+#ifdef NOT_ESP_CORE
+  Console << "---> MESSAGE " << t << ' ' << _HEX(typ) << ' ' << " mem=???" << endl;
+#else
+  Console << "---> MESSAGE " << t << ' ' << _HEX(typ) << ' ' << " mem=" << ESP.getFreeHeap() << endl;
+#endif
+  Console.fg(white);
+
   uint16_t addr=0;
   const int bytes_per_row = 8;
   const char* hex_to_str = " | ";
   const char* separator = hex_to_str;
   const char* half_sep = " - ";
-  std::string ascii;
+  string ascii;
 
-  Serial << prefix << " size(" << buffer.size() << "), state=" << state << endl;
+  Console << prefix << " size(" << buffer.size() << "), state=" << state << endl;
 
   for(const char chr: buffer)
   {
     if ((addr % bytes_per_row) == 0)
     {
-      if (ascii.length()) Serial << hex_to_str << ascii << separator << endl;
+      if (ascii.length()) Console << hex_to_str << ascii << separator << endl;
-      if (prefix) Serial << prefix << separator;
+      if (prefix) Console << prefix << separator;
       ascii.clear();
     }
     addr++;
-    if (chr<16) Serial << '0';
+    if (chr<16) Console << '0';
-    Serial << _HEX(chr) << ' ';
+    Console << _HEX(chr) << ' ';
 
     ascii += (chr<32 ? '.' : chr);
     if (ascii.length() == (bytes_per_row/2)) ascii += half_sep;
@@ -894,12 +1044,12 @@ void MqttMessage::hexdump(const char* prefix) const
   {
     while(ascii.length() < bytes_per_row+strlen(half_sep))
     {
-      Serial << "   ";  // spaces per hexa byte
+      Console << "   ";  // spaces per hexa byte
       ascii += ' ';
     }
-    Serial << hex_to_str << ascii << separator;
+    Console << hex_to_str << ascii << separator;
   }
 
-  Serial << endl;
+  Console << endl;
 #endif
 }

src/TinyMqtt.h

@@ -1,9 +1,19 @@
+// vim: ts=2 sw=2 expandtab
 #pragma once
 
+#define TINY_MQTT_REVISION "1.1.3"
+
+#ifndef TINY_MQTT_DEBUG
+#define TINY_MQTT_DEBUG 0
+#endif
+
 // TODO Should add a AUnit with both TINY_MQTT_ASYNC and not TINY_MQTT_ASYNC
 // #define TINY_MQTT_ASYNC  // Uncomment this to use ESPAsyncTCP instead of normal cnx
 
-#if defined(ESP8266) || defined(EPOXY_DUINO)
+
+#if defined(TINY_MQTT_ETHERNET)
+  #include <Ethernet.h>
+#elif defined(ESP8266) || defined(EPOXY_DUINO)
   #ifdef TINY_MQTT_ASYNC
     #include <ESPAsyncTCP.h>
   #else
@@ -14,6 +24,8 @@
   #ifdef TINY_MQTT_ASYNC
     #include <AsyncTCP.h> // https://github.com/me-no-dev/AsyncTCP
   #endif
+#elif defined(ARDUINO_ARCH_RP2040)
+  #include <WiFi.h>   // works with Raspberry Pi Pico W, earlephilhower
 #endif
 #ifdef EPOXY_DUINO
   #define dbg_ptr uint64_t
@@ -32,22 +44,33 @@
 #include <set>
 #include <string>
 #include "StringIndexer.h"
-#include <MqttStreaming.h>
 
-// #define TINY_MQTT_DEBUG
+#define TINY_MQTT_DEFAULT_CLIENT_ID "Tiny"
 
-#ifdef TINY_MQTT_DEBUG
+#include <TinyStreaming.h>
-  #define debug(what) { Serial << (int)__LINE__ << ' ' << what << endl; delay(100); }
+#if TINY_MQTT_DEBUG
+  #include <TinyConsole.h>    // https://github.com/hsaturn/TinyConsole
+  struct TinyMqtt
+  {
+    static int debug;
+  };
+
+  #define debug(what) { if (TinyMqtt::debug>=1) Console << (int)__LINE__ << ' ' << what << TinyConsole::white << endl; delay(100); }
 #else
   #define debug(what) {}
 #endif
 
-#ifdef TINY_MQTT_ASYNC
+#if defined(TINY_MQTT_ETHERNET)
+  using TcpClient = EthernetClient;
+  using TcpServer = EthernetServer;
+#else
+  #ifdef TINY_MQTT_ASYNC
     using TcpClient = AsyncClient;
     using TcpServer = AsyncServer;
-#else
+  #else
     using TcpClient = WiFiClient;
     using TcpServer = WiFiServer;
+  #endif
 #endif
 
 enum __attribute__((packed)) MqttError
@@ -57,12 +80,15 @@ enum __attribute__((packed)) MqttError
   MqttInvalidMessage=2,
 };
 
+using string = TinyConsole::string;
+
 class Topic : public IndexedString
 {
   public:
+    Topic(const string& m) : IndexedString(m){}
     Topic(const char* s, uint8_t len) : IndexedString(s,len){}
     Topic(const char* s) : Topic(s, strlen(s)) {}
-    Topic(const std::string s) : Topic(s.c_str(), s.length()){};
+    // Topic(const string s) : Topic(s.c_str(), s.length()){};
 
     const char* c_str() const { return str().c_str(); }
 
@@ -89,6 +115,7 @@ class MqttMessage
       PingResp    = 0xD0,
       Disconnect  = 0xE0
     };
+
     enum __attribute__((packed)) State
     {
       FixedHeader=0,
@@ -100,16 +127,25 @@ class MqttMessage
       Create=6
     };
 
+    static inline uint32_t getSize(const char* buffer)
+    {
+      const unsigned char* bun = (const unsigned char*)buffer;
+      return (*bun << 8) | bun[1]; }
+
     MqttMessage() { reset(); }
-    MqttMessage(Type t, uint8_t bits_d3_d0=0) { create(t); buffer[0] |= bits_d3_d0; }
+    MqttMessage(Type t, uint8_t bits_d3_d0=0) { create(t); buffer[0] |= (bits_d3_d0 & 0xF); }
+    MqttMessage(const MqttMessage& m)
+      : buffer(m.buffer), vheader(m.vheader), size(m.size), state(m.state) {}
+
     void incoming(char byte);
     void add(char byte) { incoming(byte); }
     void add(const char* p, size_t len, bool addLength=true );
-    void add(const std::string& s) { add(s.c_str(), s.length()); }
+    void add(const string& s) { add(s.c_str(), s.length()); }
     void add(const Topic& t) { add(t.str()); }
     const char* end() const { return &buffer[0]+buffer.size(); }
     const char* getVHeader() const { return &buffer[vheader]; }
     void complete() { encodeLength(); }
+    void retained() { if ((buffer[0] & 0xF)==Publish) buffer[0] |= 1; }
 
     void reset();
 
@@ -136,10 +172,19 @@ class MqttMessage
     MqttError sendTo(MqttClient*);
     void hexdump(const char* prefix=nullptr) const;
 
+    MqttMessage& operator = (MqttMessage&& m)
+    {
+      buffer = std::move(m.buffer);
+      vheader = m.vheader;
+      size = m.size;
+      state = m.state;
+      return *this;
+    }
+
   private:
     void encodeLength();
 
-    std::string buffer;
+    string buffer;
     uint8_t vheader;
     uint16_t size;  // bytes left to receive
     State state;
@@ -148,7 +193,6 @@ class MqttMessage
 class MqttBroker;
 class MqttClient
 {
-  using CallBack = void (*)(const MqttClient* source, const Topic& topic, const char* payload, size_t payload_length);
   enum __attribute__((packed)) Flags
   {
     FlagUserName = 128,
@@ -159,27 +203,44 @@ class MqttClient
     FlagCleanSession = 2,  // unsupported
     FlagReserved = 1
   };
+
+  enum __attribute__((packed)) CltFlags
+  {
+    CltFlagNone = 0,
+    CltFlagConnected = 1,
+    CltFlagToDelete = 2
+  };
   public:
-    /** Constructor. If broker is not null, this is the adress of a local broker.
+
+    using CallBack = void (*)(const MqttClient* source, const Topic& topic, const char* payload, size_t payload_length);
+
+    /** Constructor. Broker is the adress of a local broker if not null
         If you want to connect elsewhere, leave broker null and use connect() **/
-    MqttClient(MqttBroker* broker = nullptr, const std::string& id="");
+    MqttClient(MqttBroker* broker = nullptr, const string& id = TINY_MQTT_DEFAULT_CLIENT_ID);
-    MqttClient(const std::string& id) : MqttClient(nullptr, id){}
+    MqttClient(const string& id) : MqttClient(nullptr, id){}
 
     ~MqttClient();
 
-    void connect(MqttBroker* parent);
+    void connect(MqttBroker* local_broker);
-    void connect(std::string broker, uint16_t port, uint16_t keep_alive = 10);
+    void connect(string broker, uint16_t port = 1883, uint16_t keep_alive = 10);
+    void connect(const IPAddress& ip, uint16_t port = 1883, uint16_t keep_alive = 10)
+    { connect(ip.toString().c_str(), port, keep_alive); }
 
     // TODO it seems that connected returns true in tcp mode even if
-    // no negociation occured (only if tcp link is established)
+    // no negociation occurred
-    bool connected() { return
+    bool connected()
-      (parent!=nullptr and client==nullptr) or
+    {
-      (client and client->connected()); }
+      return (local_broker!=nullptr and tcp_client==nullptr)
-    void write(const char* buf, size_t length)
+           or (tcp_client and tcp_client->connected());
-    { if (client) client->write(buf, length); }
+    }
 
-    const std::string& id() const { return clientId; }
+    void write(const char* buf, size_t length)
-    void id(std::string& new_id) { clientId = new_id; }
+    {
+      if (tcp_client) tcp_client->write(buf, length);
+    }
+
+    const string& id() const { return clientId; }
+    void id(const string& new_id) { clientId = new_id; }
 
     /** Should be called in main loop() */
     void loop();
@@ -187,18 +248,18 @@ class MqttClient
     void setCallback(CallBack fun)
     {
       callback=fun;
-      #ifdef TINY_MQTT_DEBUG
+      #if TINY_MQTT_DEBUG
-        Serial << "Callback set to " << (long)fun << endl;
+        Console << TinyConsole::magenta << "Callback set to " << (long)fun << TinyConsole::white << endl;
         if (callback) callback(this, "test/topic", "value", 5);
       #endif
     };
 
     // Publish from client to the world
-    MqttError publish(const Topic&, const char* payload, size_t pay_length);
+    MqttError publish(const Topic&, const char* payload, size_t pay_length, bool retain=false);
-    MqttError publish(const Topic& t, const char* payload) { return publish(t, payload, strlen(payload)); }
+    MqttError publish(const Topic& t, const char* payload, bool retain=false) { return publish(t, payload, strlen(payload), retain); }
-    MqttError publish(const Topic& t, const String& s) { return publish(t, s.c_str(), s.length()); }
+    MqttError publish(const Topic& t, const String& s, bool retain=false) { return publish(t, s.c_str(), s.length(), retain); }
-    MqttError publish(const Topic& t, const std::string& s) { return publish(t,s.c_str(),s.length());}
+    MqttError publish(const Topic& t, const string& s, bool retain=false) { return publish(t,s.c_str(),s.length(), retain);}
-    MqttError publish(const Topic& t) { return publish(t, nullptr, 0);};
+    MqttError publish(const Topic& t, bool retain=false) { return publish(t, nullptr, 0, retain);};
 
     MqttError subscribe(Topic topic, uint8_t qos=0);
     MqttError unsubscribe(Topic topic);
@@ -206,37 +267,49 @@ class MqttClient
 
     // connected to local broker
     // TODO seems to be useless
-    bool isLocal() const { return client == nullptr; }
+    bool isLocal() const { return tcp_client == nullptr; }
 
-    void dump(std::string indent="")
+    void dump(string indent="")
     {
       (void)indent;
-      #ifdef TINY_MQTT_DEBUG
+      #if TINY_MQTT_DEBUG
         uint32_t ms=millis();
-        Serial << indent << "+-- " << '\'' << clientId.c_str() << "' " << (connected() ? " ON " : " OFF");
+        Console << indent << "+-- " << '\'' << clientId.c_str() << "' " << (connected() ? " ON " : " OFF");
-        Serial << ", alive=" << alive << '/' << ms << ", ka=" << keep_alive << ' ';
+        Console << ", alive=" << alive << '/' << ms << ", ka=" << keep_alive << ' ';
-        Serial << (client && client->connected() ? "" : "dis") << "connected";
+        if (tcp_client)
+        {
+          if (tcp_client->connected())
+            Console << TinyConsole::green << "connected";
+          else
+            Console << TinyConsole::red << "disconnected";
+          Console << TinyConsole::white;
+        }
         if (subscriptions.size())
         {
           bool c = false;
-          Serial << " [";
+          Console << " [";
           for(auto s: subscriptions)
           {
-            if (c) Serial << ", ";
+            if (c) Console << ", ";
-            Serial << s.str().c_str();
+            Console << s.str().c_str();
             c=true;
           }
-          Serial << ']';
+          Console << ']';
         }
-        Serial << endl;
+        Console << TinyConsole::erase_to_end << endl;
       #endif
     }
 
 #ifdef EPOXY_DUINO
     static std::map<MqttMessage::Type, int> counters;  // Number of processed messages
+    static int instances;
 #endif
+    uint32_t keepAlive() const { return keep_alive; }
 
   private:
+    bool mqtt_connected() const { return cltFlags & CltFlagConnected; }
+    void setFlag(CltFlags f) { cltFlags |= f; }
+    void resetFlag(CltFlags f) { cltFlags &= ~f; }
 
     // event when tcp/ip link established (real or fake)
     static void onConnect(void * client_ptr, TcpClient*);
@@ -247,57 +320,60 @@ class MqttClient
     void resubscribe();
 
     friend class MqttBroker;
-    MqttClient(MqttBroker* parent, TcpClient* client);
+    MqttClient(MqttBroker* local_broker, TcpClient* client);
     // republish a received publish if topic matches any in subscriptions
     MqttError publishIfSubscribed(const Topic& topic, MqttMessage& msg);
 
     void clientAlive(uint32_t more_seconds);
     void processMessage(MqttMessage* message);
 
-    bool mqtt_connected = false;
+    uint8_t cltFlags = CltFlagNone;
     char mqtt_flags;
-    uint32_t keep_alive = 60;
+    uint32_t keep_alive = 30;
     uint32_t alive;
     MqttMessage message;
 
-    // TODO  having a pointer on MqttBroker may produce larger binaries
+    // connection to local broker, or link to the parent
-    // due to unecessary function linked if ever parent is not used
+    // when MqttBroker uses MqttClient for each external connexion
-    // (this is the case when MqttBroker isn't used except here)
+    MqttBroker* local_broker=nullptr;
-    MqttBroker* parent=nullptr;    // connection to local broker
 
-    TcpClient* client=nullptr;    // connection to remote broker
+    TcpClient* tcp_client=nullptr;    // connection to remote broker
     std::set<Topic>  subscriptions;
-    std::string clientId;
+    string clientId;
     CallBack callback = nullptr;
 };
 
 class MqttBroker
 {
-  enum __attribute__((packed)) State
-  {
-    Disconnected,  // Also the initial state
-    Connecting,    // connect and sends a fake publish to avoid circular cnx
-    Connected,    // this->broker is connected and circular cnx avoided
-  };
   public:
     // TODO limit max number of clients
-    MqttBroker(uint16_t port);
+    MqttBroker(uint16_t port, uint8_t retain_size=0);
     ~MqttBroker();
 
     void begin() { server->begin(); }
     void loop();
 
-    void connect(const std::string& host, uint16_t port=1883);
+    /** Connect the broker to a parent broker */
-    bool connected() const { return state == Connected; }
+    void connect(const string& host, uint16_t port=1883);
+    /** returns true if connected to another broker */
+    bool connected() const { return remote_broker ? remote_broker->connected() : false; }
 
     size_t clientsCount() const { return clients.size(); }
+    uint8_t retain() { return retain_size; }
+    void retain(uint8_t size) { retain_size = size; if (size==0) retained.clear(); }
+    uint8_t retainCount() const { return retained.size(); }
 
-    void dump(std::string indent="")
+    void dump(string indent="")
     {
       for(auto client: clients)
         client->dump(indent);
     }
 
+    const std::vector<MqttClient*>  getClients() const { return clients; }
+#ifdef EPOXY_DUINO
+    static int instances;
+#endif
+
   private:
     friend class MqttClient;
 
@@ -308,22 +384,45 @@ class MqttBroker
     bool checkPassword(const char* password, uint8_t len) const
     { return compareString(auth_password, password, len); }
 
+    MqttError publish(const MqttClient* source, const Topic& topic, MqttMessage& msg);
 
-    MqttError publish(const MqttClient* source, const Topic& topic, MqttMessage& msg) const;
+    MqttError subscribe(MqttClient*, const Topic& topic, uint8_t qos);
 
-    MqttError subscribe(const Topic& topic, uint8_t qos);
+    // For clients that are added not by the broker itself (local clients)
-
-    // For clients that are added not by the broker itself
     void addClient(MqttClient* client);
     void removeClient(MqttClient* client);
 
     bool compareString(const char* good, const char* str, uint8_t str_len) const;
     std::vector<MqttClient*>  clients;
-    TcpServer* server;
+
+  private:
+    TcpServer* server = nullptr;
 
     const char* auth_user = "guest";
     const char* auth_password = "guest";
-    State state = Disconnected;
+    MqttClient* remote_broker = nullptr;
 
-    MqttClient* broker = nullptr;
+    void closeRemoteBroker();
+
+    void retain(const Topic& topic, const MqttMessage& msg);
+    void retainDrop();
+
+    struct Retain
+    {
+      Retain(unsigned long ts, const MqttMessage& m) : timestamp(ts), msg(m) {}
+      Retain(Retain&& r) : timestamp(r.timestamp), msg(std::move(r.msg)) {}
+
+      Retain& operator=(Retain&& r)
+      {
+        timestamp = r.timestamp;
+        msg = std::move(r.msg);
+        return *this;
+      }
+
+      unsigned long timestamp;
+      MqttMessage msg;
+    };
+
+    std::map<Topic, Retain> retained;
+    uint8_t retain_size;
 };

src/my_credentials.h

@@ -1,2 +0,0 @@
-const char *ssid     = "YOUR-SSID-HERE";
-const char *password = "YOUR-PASSWORD-HERE";

tests/Makefile

@@ -1,28 +1,40 @@
+SUB=
+
+all:runtests
+
 tests:
-	set -e; \
+	@set -e; \
-	for i in *-tests/Makefile; do \
+	for i in $(SUB)*-tests/Makefile; do \
 		echo '==== Making:' $$(dirname $$i); \
 		$(MAKE) -C $$(dirname $$i) -j; \
 	done
+	$(MAKE) -C compile-test
+
+valgrind:
+	@set -e; \
+	$(MAKE) tests; \
+	for i in $(SUB)*-tests/Makefile; do \
+		echo '==== Running:' $$(dirname $$i); \
+		valgrind $$(dirname $$i)/$$(dirname $$i).out; \
+	done
 
 debugtest:
-	set -e; \
+	@set -e; \
 	$(MAKE) clean; \
 	$(MAKE) -C debug-mode -j; \
 	debug-mode/debug-tests.out
 
-runtests: debugtest
+runtests:
-	$(MAKE) clean
+	@set -e; \
-	$(MAKE) tests
+	$(MAKE) tests; \
-	set -e; \
+	for i in $(SUB)*-tests/Makefile; do \
-	for i in *-tests/Makefile; do \
 		echo '==== Running:' $$(dirname $$i); \
 		$$(dirname $$i)/$$(dirname $$i).out; \
 	done
 
 clean:
-	set -e; \
+	@set -e; \
-	for i in *-tests/Makefile; do \
+	for i in $(SUB)*-tests/Makefile; do \
 		echo '==== Cleaning:' $$(dirname $$i); \
 		$(MAKE) -C $$(dirname $$i) clean; \
 	done

tests/Makefile.opts

@@ -0,0 +1,11 @@
+
+# GCC
+# CXXFLAGS = -Wextra -Wall -std=gnu++11 -fno-exceptions -fno-threadsafe-statics
+EXTRA_CXXFLAGS=-g3 -O0 -std=c++17
+
+CXXFLAGS=-D_GNU_SOURCE -Werror=return-type -std=gnu++17 -Wall -g3 -O0
+
+# CLANG SANITIZE
+# CXX=clang
+# EXTRA_CXXFLAGS=-g3 -O0 -fsanitize=memory
+# LDFLAGS = -lpthread -lstdc++

tests/classbind-tests/Makefile

@@ -0,0 +1,10 @@
+# See https://github.com/bxparks/EpoxyDuino for documentation about this
+# Makefile to compile and run Arduino programs natively on Linux or MacOS.
+
+EXTRA_CXXFLAGS=-g3 -O0 -DTINY_MQTT_TESTS
+
+APP_NAME := classbind-tests
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP TinyConsole
+ARDUINO_LIB_DIRS := ../../../EspMock/libraries
+EPOXY_CORE := EPOXY_CORE_ESP8266
+include ../../../EpoxyDuino/EpoxyDuino.mk

tests/classbind-tests/classbind-tests.ino

@@ -0,0 +1,353 @@
+// vim: ts=2 sw=2 expandtab
+#include <Arduino.h>
+#include <AUnit.h>
+#include <TinyMqtt.h>
+#include <MqttClassBinder.h>
+#include <map>
+#include <iostream>
+#include <iomanip>
+#include <sstream>
+#include <string>
+#include <iostream>
+
+// --------------------- CUT HERE - MQTT MESSAGE ROUTER FILE ----------------------------
+
+class TestReceiver : public MqttClassBinder<TestReceiver>
+{
+  public:
+    TestReceiver(const char* name) : MqttClassBinder(), name_(name) {}
+
+    void onPublish(const MqttClient* /* source */, const Topic& topic, const char* /* payload */, size_t /* length */)
+    {
+      (void) topic;
+      // Serial << "--> routed message received by " << name_ << ':' << topic.c_str() << " = " << payload << endl;
+      messages[name_]++;
+    }
+
+  private:
+    const std::string name_;
+
+  public:
+    static std::map<std::string, int> messages;
+};
+
+std::map<std::string, int> TestReceiver::messages;
+
+static int unrouted = 0;
+void onUnrouted(const MqttClient*, const Topic& topic, const char*, size_t)
+{
+  (void) topic;
+  // Serial << "--> unrouted: " << topic.c_str() << endl;
+  unrouted++;
+}
+
+
+static std::string topic="sensor/temperature";
+
+/**
+  * TinyMqtt network unit tests.
+  *
+  * No wifi connection unit tests.
+  * Checks with a local broker. Clients must connect to the local broker
+  **/
+
+// if ascii_pos = 0, no ascii dump, else ascii dump starts after column ascii_pos
+std::string bufferToHexa(const uint8_t* buffer, size_t length, char sep = 0, size_t ascii_pos = 0)
+{
+  std::stringstream out;
+  std::string ascii;
+  std::string h("0123456789ABCDEF");
+  for(size_t i=0; i<length; i++)
+  {
+    uint8_t c = buffer[i];
+    out << h[ c >> 4] << h[ c & 0x0F ];
+    if (sep) out << sep;
+    if (ascii_pos)
+    {
+      if (c>=32)
+        ascii += c;
+      else
+        ascii +='.';
+    }
+  }
+  std::string ret(out.str());
+  if (ascii_pos)
+  {
+    while(ret.length() < ascii_pos)
+      ret += ' ';
+    ret +='[' + ascii + ']';
+  }
+  return ret;
+}
+
+void dumpMqttMessage(const uint8_t* buffer, size_t length)
+{
+  std::map<int, std::string> pkt =
+  { { MqttMessage::Unknown     , "Unknown     " },
+    { MqttMessage::Connect     , "Connect     " },
+    { MqttMessage::ConnAck     , "ConnAck     " },
+    { MqttMessage::Publish     , "Publish     " },
+    { MqttMessage::PubAck      , "PubAck      " },
+    { MqttMessage::Subscribe   , "Subscribe   " },
+    { MqttMessage::SubAck      , "SubAck      " },
+    { MqttMessage::UnSubscribe , "Unsubscribe " },
+    { MqttMessage::UnSuback    , "UnSubAck    " },
+    { MqttMessage::PingReq     , "PingReq     " },
+    { MqttMessage::PingResp    , "PingResp    " },
+    { MqttMessage::Disconnect  , "Disconnect  " } };
+
+  std::cout << "       |   data sent " << std::setw(3) << length << " : ";
+  auto it = pkt.find(buffer[0] & 0xF0);
+  if (it == pkt.end())
+    std::cout << pkt[MqttMessage::Unknown];
+  else
+    std::cout << it->second;
+
+  std::cout << bufferToHexa(buffer, length, ' ', 60) << std::endl;
+}
+
+String toString(const IPAddress& ip)
+{
+  return String(ip[0])+'.'+String(ip[1])+'.'+String(ip[2])+'.'+String(ip[3]);
+}
+
+MqttBroker broker(1883);
+
+void reset_and_start_servers(int n, bool early_accept = true)
+{
+  MqttClassBinder<TestReceiver>::reset();
+  TestReceiver::messages.clear();
+  unrouted = 0;
+
+  ESP8266WiFiClass::resetInstances();
+  ESP8266WiFiClass::earlyAccept = early_accept;
+  while(n)
+  {
+    ESP8266WiFiClass::selectInstance(n--);
+    WiFi.mode(WIFI_STA);
+    WiFi.begin("fake_ssid", "fake_pwd");
+  }
+}
+
+test(classbind_one_client_receives_the_message)
+{
+  reset_and_start_servers(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  IPAddress ip_broker = WiFi.localIP();
+
+  // We have a 2nd ESP in order to test through wifi (opposed to local)
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient client;
+  client.connect(ip_broker.toString().c_str(), 1883);
+  broker.loop();
+  assertTrue(client.connected());
+
+  TestReceiver receiver("receiver");
+  MqttClassBinder<TestReceiver>::onPublish(&client, &receiver);
+
+  client.subscribe("a/b");
+  client.publish("a/b", "ab");
+
+  for (int i =0; i<10; i++)
+  {
+    client.loop();
+    broker.loop();
+  }
+
+  assertEqual(TestReceiver::messages["receiver"], 1);
+  assertEqual(unrouted, 0);
+}
+
+test(classbind_routes_should_be_empty_when_receiver_goes_out_of_scope)
+{
+  reset_and_start_servers(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  IPAddress ip_broker = WiFi.localIP();
+
+  // We have a 2nd ESP in order to test through wifi (opposed to local)
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient client;
+  client.connect(ip_broker.toString().c_str(), 1883);
+  broker.loop();
+  assertTrue(client.connected());
+
+  // Make a receiver going out of scope
+  {
+    TestReceiver receiver("receiver");
+    MqttClassBinder<TestReceiver>::onPublish(&client, &receiver);
+    assertEqual(MqttClassBinder<TestReceiver>::size(), (size_t)1);
+  }
+
+  client.subscribe("a/b");
+  client.publish("a/b", "ab");
+
+  for (int i =0; i<10; i++)
+  {
+    client.loop();
+    broker.loop();
+  }
+
+  assertEqual(TestReceiver::messages["receiver"], 0);
+  assertEqual(MqttClassBinder<TestReceiver>::size(), (size_t)0);
+}
+
+test(classbind_publish_should_be_dispatched_to_many_receivers)
+{
+  reset_and_start_servers(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  IPAddress ip_broker = WiFi.localIP();
+
+  // We have a 2nd ESP in order to test through wifi (opposed to local)
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient client;
+  client.connect(ip_broker.toString().c_str(), 1883);
+  broker.loop();
+  assertTrue(client.connected());
+
+  TestReceiver receiver_1("receiver_1");
+  TestReceiver receiver_2("receiver_2");
+
+  MqttClassBinder<TestReceiver>::onPublish(&client, &receiver_1);
+  MqttClassBinder<TestReceiver>::onPublish(&client, &receiver_2);
+  client.subscribe("a/b");
+  client.publish("a/b", "ab");
+
+  for (int i =0; i<10; i++)
+  {
+    client.loop();
+    broker.loop();
+  }
+
+  assertEqual(TestReceiver::messages["receiver_1"], 1);
+  assertEqual(TestReceiver::messages["receiver_2"], 1);
+}
+
+test(classbind_register_to_many_clients)
+{
+  reset_and_start_servers(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  IPAddress ip_broker = WiFi.localIP();
+
+  // We have a 2nd ESP in order to test through wifi (opposed to local)
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient client_1;
+  client_1.connect(ip_broker.toString().c_str(), 1883);
+  broker.loop();
+
+  MqttClient client_2;
+  client_2.connect(ip_broker.toString().c_str(), 1883);
+  broker.loop();
+
+  assertTrue(client_1.connected());
+  assertTrue(client_2.connected());
+
+  TestReceiver receiver("receiver");
+
+  MqttClassBinder<TestReceiver>::onPublish(&client_1, &receiver);
+  MqttClassBinder<TestReceiver>::onPublish(&client_2, &receiver);
+
+  auto loop = [&client_1, &client_2, &broker]()
+  {
+    client_1.loop();
+    client_2.loop();
+    broker.loop();
+  };
+
+  client_1.subscribe("a/b");
+  client_2.subscribe("a/b");
+
+  // Ensure subscribptions are passed
+  for (int i =0; i<5; i++) loop();
+
+  client_1.publish("a/b", "from 1");
+  client_2.publish("a/b", "from 2");
+
+  // Ensure publishes are processed
+  for (int i =0; i<5; i++) loop();
+
+  assertEqual(TestReceiver::messages["receiver"], 4);
+}
+
+test(classbind_unrouted_fallback)
+{
+  reset_and_start_servers(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  IPAddress ip_broker = WiFi.localIP();
+
+  // We have a 2nd ESP in order to test through wifi (opposed to local)
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient client;
+  client.connect(ip_broker.toString().c_str(), 1883);
+  broker.loop();
+
+  assertTrue(client.connected());
+
+  MqttClassBinder<TestReceiver>::onUnpublished(onUnrouted);
+  {
+    TestReceiver receiver("receiver");
+    MqttClassBinder<TestReceiver>::onPublish(&client, &receiver);
+  }
+
+  client.subscribe("a/b");
+  client.publish("a/b", "from 2");
+
+  // Ensure subscribptions are passed
+  for (int i =0; i<5; i++)
+  {
+    client.loop();
+    broker.loop();
+  }
+
+  assertEqual(TestReceiver::messages["receiver"], 0);
+  assertEqual(unrouted, 1);
+}
+
+test(classbind_should_cleanup_when_MqttClient_dies)
+{
+  reset_and_start_servers(2, true);
+  TestReceiver receiver("receiver");
+
+  {
+    MqttClient client;
+
+    MqttClassBinder<TestReceiver>::onPublish(&client, &receiver);
+    assertEqual(MqttClassBinder<TestReceiver>::size(), (size_t)1);
+  }
+  assertEqual(MqttClassBinder<TestReceiver>::size(), (size_t)1);
+
+}
+
+//----------------------------------------------------------------------------
+// setup() and loop()
+void setup() {
+  /* delay(1000);
+  Serial.begin(115200);
+  while(!Serial);
+  */
+
+  Serial.println("=============[ TinyMqtt class-bind TESTS       ]========================");
+
+  WiFi.mode(WIFI_STA);
+  WiFi.begin("network", "password");
+}
+
+void loop() {
+  aunit::TestRunner::run();
+
+  if (Serial.available()) ESP.reset();
+}

tests/compile-test/Makefile

@@ -0,0 +1,23 @@
+# vim: noexpandtab
+
+
+APP_NAME := compile-tests
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsync ESP8266mDNS TinyConsole
+ARDUINO_LIB_DIRS := ../../../EspMock/libraries
+EPOXY_CORE := EPOXY_CORE_ESP8266
+DUMMY := 1
+RUN = no
+APP_SRCS_COMP += $(shell find ../../examples -name "*.ino")
+APP_SRCS_CPP += $(APP_SRCS_COMP:%.ino=%.o)
+CXXFLAGS = -D_GNU_SOURCE -Werror=return-type -std=gnu++17 -Wall -g3 -O0 -DEPOXY_DUINO
+
+include ../Makefile.opts
+
+all:
+
+compile-tests.out: $(OBJS)
+
+run:
+	@echo "No run for compile tests"
+	exit 0
+

tests/debug-mode/Makefile

@@ -7,7 +7,7 @@ EXTRA_CXXFLAGS=-g3 -O0 -DTINY_MQTT_DEBUG
 CXXFLAGS = -Wextra -Wall -std=gnu++11 -fno-exceptions -fno-threadsafe-statics
 
 APP_NAME := debug-tests
-ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP TinyConsole
 ARDUINO_LIB_DIRS := ../../../EspMock/libraries
 EPOXY_CORE := EPOXY_CORE_ESP8266
 include ../../../EpoxyDuino/EpoxyDuino.mk

tests/length-tests.todo/Makefile

@@ -4,7 +4,7 @@
 EXTRA_CXXFLAGS=-g3 -O0
 
 APP_NAME := length-tests
-ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP TinyConsole
 ARDUINO_LIB_DIRS := ../../../EspMock/libraries
 EPOXY_CORE := EPOXY_CORE_ESP8266
 include ../../../EpoxyDuino/EpoxyDuino.mk

tests/length-tests.todo/length-tests.ino

@@ -1,3 +1,4 @@
+// vim: ts=2 sw=2 expandtab
 #include <AUnit.h>
 #include <TinyMqtt.h>
 #include <map>

tests/local-tests/Makefile

@@ -1,13 +1,10 @@
 # See https://github.com/bxparks/EpoxyDuino for documentation about this
 # Makefile to compile and run Arduino programs natively on Linux or MacOS.
 
-EXTRA_CXXFLAGS=-g3 -O0
+include ../Makefile.opts
-
-# Remove flto flag from EpoxyDuino (too many <optimized out>)
-CXXFLAGS = -Wextra -Wall -std=gnu++11 -fno-exceptions -fno-threadsafe-statics
 
 APP_NAME := local-tests
-ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP TinyConsole
 ARDUINO_LIB_DIRS := ../../../EspMock/libraries
 EPOXY_CORE := EPOXY_CORE_ESP8266
 include ../../../EpoxyDuino/EpoxyDuino.mk

tests/local-tests/local-tests.ino

@@ -12,23 +12,32 @@
   * Also, this will allow to mock and thus run Action on github
   **/
 
-using namespace std;
+using string = TinyConsole::string;
 
 MqttBroker broker(1883);
 
-std::map<std::string, std::map<Topic, int>>  published;    // map[client_id] => map[topic] = count
+std::map<string, std::map<Topic, int>>  published;    // map[client_id] => map[topic] = count
 
-const char* lastPayload;
+std::string lastPayload;
 size_t lastLength;
 
 void onPublish(const MqttClient* srce, const Topic& topic, const char* payload, size_t length)
 {
   if (srce)
     published[srce->id()][topic]++;
-  lastPayload = payload;
+  lastPayload = std::string(payload, length);
   lastLength = length;
 }
 
+test(local_not_connected_by_default)
+{
+  MqttClient client;
+  assertEqual(client.connected(), false);
+
+  MqttBroker broker(1883);
+  assertEqual(broker.connected(), false);
+}
+
 test(local_client_should_unregister_when_destroyed)
 {
   assertEqual(broker.clientsCount(), (size_t)0);
@@ -40,27 +49,70 @@ test(local_client_should_unregister_when_destroyed)
   assertEqual(broker.clientsCount(), (size_t)0);
 }
 
-#if 0
+test(local_client_do_not_disconnect_after_publishing_and_long_inactivity)
+{
+  published.clear();
+  EpoxyTest::set_millis(0);
+  MqttBroker broker(1883);
+  MqttClient client(&broker, "client");
+  MqttClient sender(&broker, "sender");
+  broker.loop();
+
+  client.subscribe("#");
+  client.subscribe("test");
+  client.setCallback(onPublish);
+  assertEqual(broker.clientsCount(), (size_t)2);
+
+  sender.publish("test", "value");
+  broker.loop();
+
+  EpoxyTest::add_seconds(600);
+  client.loop();
+  sender.loop();
+  broker.loop();
+
+  sender.publish("test", "value");
+  broker.loop();
+  sender.loop();
+  broker.loop();
+
+  assertEqual(broker.clientsCount(), (size_t)2);
+  assertEqual(sender.connected(), true);
+  assertEqual(client.connected(), true);
+
+  assertEqual(published.size(), (size_t)1);  // client has received something
+}
+
 test(local_connect)
 {
   assertEqual(broker.clientsCount(), (size_t)0);
 
-  MqttClient client;
+  MqttClient client(&broker);
   assertTrue(client.connected());
   assertEqual(broker.clientsCount(), (size_t)1);
 }
 
+test(local_publish_to_nowhere)
+{
+  published.clear();
+  assertEqual(broker.clientsCount(), (size_t)0);
+
+  MqttClient publisher;
+  MqttError status = publisher.publish("a/b");
+  assertEqual(status, MqttError::MqttNowhereToSend);
+}
+
 test(local_publish_should_be_dispatched)
 {
   published.clear();
   assertEqual(broker.clientsCount(), (size_t)0);
 
-  MqttClient subscriber;
+  MqttClient subscriber(&broker, "");
   subscriber.subscribe("a/b");
   subscriber.subscribe("a/c");
   subscriber.setCallback(onPublish);
 
-  MqttClient publisher;
+  MqttClient publisher(&broker);
   publisher.publish("a/b");
   publisher.publish("a/c");
   publisher.publish("a/c");
@@ -70,21 +122,40 @@ test(local_publish_should_be_dispatched)
   assertEqual(published[""]["a/c"], 2);
 }
 
+test(hudge_payload)
+{
+  published.clear();
+  const char* payload="This payload is hudge, just because its length exceeds 127. Thus when encoding length, we have to encode it on two bytes at min. This should not prevent the message from being encoded and decoded successfully !";
+
+  MqttClient subscriber(&broker);
+  assertEqual(broker.clientsCount(), (size_t)1);
+  subscriber.setCallback(onPublish);
+  subscriber.subscribe("a/b");          // Note -> this does not send any byte .... (nowhere to send)
+
+  MqttClient publisher(&broker);
+  publisher.publish("a/b", payload);    // This publish is received
+
+  // onPublish should have filled lastPayload and lastLength
+  assertEqual(payload, lastPayload.c_str());
+  assertEqual(lastLength, strlen(payload));
+  assertEqual(strncmp(payload, lastPayload.c_str(), lastLength), 0);
+}
+
 test(local_publish_should_be_dispatched_to_local_clients)
 {
   published.clear();
   assertEqual(broker.clientsCount(), (size_t)0);
 
-  MqttClient subscriber_a("A");
+  MqttClient subscriber_a(&broker, "A");
   subscriber_a.setCallback(onPublish);
   subscriber_a.subscribe("a/b");
   subscriber_a.subscribe("a/c");
 
-  MqttClient subscriber_b("B");
+  MqttClient subscriber_b(&broker, "B");
   subscriber_b.setCallback(onPublish);
   subscriber_b.subscribe("a/b");
 
-  MqttClient publisher;
+  MqttClient publisher(&broker);
   publisher.publish("a/b");
   publisher.publish("a/c");
 
@@ -100,11 +171,11 @@ test(local_unsubscribe)
   published.clear();
   assertEqual(broker.clientsCount(), (size_t)0);
 
-  MqttClient subscriber;
+  MqttClient subscriber(&broker, "");
   subscriber.setCallback(onPublish);
   subscriber.subscribe("a/b");
 
-  MqttClient publisher;
+  MqttClient publisher(&broker);
   publisher.publish("a/b");
 
   subscriber.unsubscribe("a/b");
@@ -120,9 +191,9 @@ test(local_nocallback_when_destroyed)
   published.clear();
   assertEqual(broker.clientsCount(), (size_t)0);
 
-  MqttClient publisher;
+  MqttClient publisher(&broker);
   {
-    MqttClient subscriber;
+    MqttClient subscriber(&broker);
     subscriber.setCallback(onPublish);
     subscriber.subscribe("a/b");
     publisher.publish("a/b");
@@ -132,7 +203,6 @@ test(local_nocallback_when_destroyed)
 
   assertEqual(published.size(), (size_t)1);  // Only one publish has been received
 }
-#endif
 
 //----------------------------------------------------------------------------
 // setup() and loop()

tests/network-tests/Makefile

@@ -1,13 +1,13 @@
 # See https://github.com/bxparks/EpoxyDuino for documentation about this
 # Makefile to compile and run Arduino programs natively on Linux or MacOS.
 
-EXTRA_CXXFLAGS=-g3 -O0
+include ../Makefile.opts
 
 # Remove flto flag from EpoxyDuino (too many <optimized out>)
-CXXFLAGS = -Wextra -Wall -std=gnu++11 -fno-exceptions -fno-threadsafe-statics
+# CXXFLAGS = -Wextra -Wall -std=gnu++11 -fno-exceptions -fno-threadsafe-statics
 
 APP_NAME := network-tests
-ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP TinyConsole
 ARDUINO_LIB_DIRS := ../../../EspMock/libraries
 EPOXY_CORE := EPOXY_CORE_ESP8266
 include ../../../EpoxyDuino/EpoxyDuino.mk

tests/network-tests/network-tests.ino

@@ -1,3 +1,4 @@
+// vim: ts=2 sw=2 expandtab
 #include <Arduino.h>
 #include <AUnit.h>
 #include <TinyMqtt.h>
@@ -6,6 +7,7 @@
 #include <iomanip>
 #include <sstream>
 #include <string>
+#include <iostream>
 
 /**
   * TinyMqtt network unit tests.
@@ -14,6 +16,8 @@
   * Checks with a local broker. Clients must connect to the local broker
   **/
 
+using string = TinyConsole::string;
+
 // if ascii_pos = 0, no ascii dump, else ascii dump starts after column ascii_pos
 std::string bufferToHexa(const uint8_t* buffer, size_t length, char sep = 0, size_t ascii_pos = 0)
 {
@@ -76,12 +80,12 @@ String toString(const IPAddress& ip)
 
 MqttBroker broker(1883);
 
-std::map<std::string, std::map<Topic, int>>	published;		// map[client_id] => map[topic] = count
+std::map<string, std::map<Topic, int>>  published;    // map[client_id] => map[topic] = count
 
 char* lastPayload = nullptr;
 size_t lastLength;
 
-void start_servers(int n, bool early_accept = true)
+void start_many_wifi_esp(int n, bool early_accept = true)
 {
     ESP8266WiFiClass::resetInstances();
     ESP8266WiFiClass::earlyAccept = early_accept;
@@ -103,7 +107,7 @@ void onPublish(const MqttClient* srce, const Topic& topic, const char* payload,
   lastLength = length;
 }
 
-test(network_single_broker_begin)
+test(single_broker_begin)
 {
   assertEqual(WiFi.status(), WL_CONNECTED);
 
@@ -115,7 +119,7 @@ test(network_single_broker_begin)
 
 test(suback)
 {
-  start_servers(2, true);
+  start_many_wifi_esp(2, true);
   assertEqual(WiFi.status(), WL_CONNECTED);
 
   MqttBroker broker(1883);
@@ -140,9 +144,275 @@ test(suback)
   assertEqual(MqttClient::counters[MqttMessage::Type::SubAck], 1);
 }
 
-test(network_client_to_broker_connexion)
+test(remote_client_deletion)
 {
-  start_servers(2, true);
+  assertEqual(MqttClient::instances, 0);
+  {
+    start_many_wifi_esp(3, true);
+    assertEqual(WiFi.status(), WL_CONNECTED);
+
+    MqttBroker broker(1883);
+    broker.begin();
+    IPAddress broker_ip = WiFi.localIP();
+
+    // A first remote client
+    ESP8266WiFiClass::selectInstance(2);
+    MqttClient remote_client;
+    assertEqual(MqttClient::instances, 1);
+
+    remote_client.connect(broker_ip.toString().c_str());
+    broker.loop(); remote_client.loop();
+    assertEqual(MqttClient::instances, 2);  // broker creates a client to manage remote_client
+
+    // A second remote client
+    ESP8266WiFiClass::selectInstance(3);
+    MqttClient secund_client;
+    assertEqual(MqttClient::instances, 3);
+
+    secund_client.connect(broker_ip.toString().c_str());
+    broker.loop(); remote_client.loop();
+    assertEqual(MqttClient::instances, 4);
+
+    // Now disconnect remote clients
+    remote_client.close();
+    broker.loop(); remote_client.loop();
+    assertEqual(MqttClient::instances, 3);
+
+    secund_client.close();
+    broker.loop(); remote_client.loop();
+    assertEqual(MqttClient::instances, 2);  // These instances are in this scope
+
+    // Now simulate that the external client is dead without disconnecting
+    secund_client.connect(broker_ip.toString().c_str());
+    broker.loop(); remote_client.loop();
+    assertEqual(MqttClient::instances, 3);
+
+    WiFi.disconnect();
+    broker.loop(); remote_client.loop();
+    broker.loop(); remote_client.loop();
+    assertEqual(MqttClient::instances, 2);
+
+  }
+
+  assertEqual(MqttClient::instances, 0);
+}
+
+test(broker_connect_and_client_deletion)
+{
+  assertEqual(MqttClient::instances, 0);
+  {
+    start_many_wifi_esp(2, true);
+    assertEqual(WiFi.status(), WL_CONNECTED);
+
+    MqttBroker broker(1883);
+    broker.begin();
+
+    ESP8266WiFiClass::selectInstance(2);
+    MqttBroker remote_broker(1883);
+    remote_broker.begin();
+    IPAddress remote_broker_ip = WiFi.localIP();
+    assertEqual(MqttClient::instances, 0);
+
+    ESP8266WiFiClass::selectInstance(1);
+    broker.connect(remote_broker_ip.toString().c_str());
+    remote_broker.loop();
+    assertEqual(remote_broker.clientsCount(), (size_t)1);
+
+    // Here, we have two MqttClient
+    // The client that connects broker to remote_broker
+    // The client created by remote_broker
+    assertEqual(MqttClient::instances, 2);
+
+    broker.connect("");
+    remote_broker.loop(); broker.loop();
+    remote_broker.loop(); broker.loop();
+    assertEqual(remote_broker.clientsCount(), (size_t)0);
+  }
+  assertEqual(MqttClient::instances, 0);
+}
+
+test(client_keep_alive_high)
+{
+  const uint32_t keep_alive=1000;
+  start_many_wifi_esp(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  IPAddress broker_ip = WiFi.localIP();
+
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient client;
+  client.connect(broker_ip.toString().c_str(), 1883, keep_alive);
+  broker.loop();
+
+  assertTrue(broker.clientsCount() == 1);
+  assertTrue(client.connected());
+
+  MqttClient::counters[MqttMessage::Type::SubAck] = 0;
+  client.subscribe("a/b");
+
+  // TODO how to avoid these loops ???
+  broker.loop();
+  client.loop();
+
+  assertEqual(MqttClient::counters[MqttMessage::Type::SubAck], 1);
+
+  uint32_t sz = broker.getClients().size();
+  assertEqual(sz , (uint32_t)1);
+
+  uint32_t ka = broker.getClients()[0]->keepAlive();
+  assertEqual(ka, keep_alive);
+
+}
+
+test(retained_message)
+{
+  published.clear();
+
+  start_many_wifi_esp(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  broker.retain(10);
+  IPAddress broker_ip = WiFi.localIP();
+
+  MqttClient local_client(&broker, "sender");
+
+  // Send a retained message
+  // No remote client connected
+  local_client.publish("topic", "retained once", true);
+  for(int i=0; i<2; i++) { broker.loop(); local_client.loop(); };
+
+  // Send a second message on the same topic (issue 86)
+  local_client.publish("topic", "retained once", true);
+  for(int i=0; i<2; i++) { broker.loop(); local_client.loop(); };
+
+  // Send a second message on the same topic (issue 86)
+  local_client.publish("topic", "retained last", true);
+  for(int i=0; i<2; i++) { broker.loop(); local_client.loop(); };
+
+  // No connect a client from 2nd Esp
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient remote_client("receiver");
+  remote_client.connect(broker_ip, 1883);
+  remote_client.setCallback(onPublish);
+
+  assertTrue(remote_client.connected());
+  for(int i=0; i<10; i++) { broker.loop(); local_client.loop(); remote_client.loop(); };
+  assertEqual(broker.clientsCount(), (size_t) 2);
+
+  // Should not have received anything yet
+  assertEqual(published.size(), (size_t)0);
+
+  // Now, remote client subscribes to topic
+  remote_client.subscribe("#");
+  for(int i=0; i<10; i++) { broker.loop(); local_client.loop(); remote_client.loop(); };
+
+  // Check that the retained message is published once
+  assertEqual(published.size(), (size_t)1);
+  assertEqual(published["receiver"]["topic"], 1);
+
+  // FIXME we should check that
+  // 1 - Retained message has the retain flag set
+  // 2 - Published retained messages that are send normally have their retain flag off
+
+  // The next part of this test does not pass yet (due to remote_client.close()
+  // that does not work well.
+  return;
+
+  // Now remove the retained message
+  remote_client.close();
+  for(int i=0; i<4; i++) { broker.loop(); local_client.loop(); remote_client.loop(); };
+  assertFalse(remote_client.connected());
+  assertEqual(broker.clientsCount(), (size_t) 1);
+
+  // Disconnect / reconnect the remote clien that should receive again the message
+  remote_client.connect(broker_ip, 1883);
+  remote_client.subscribe("topic");
+  assertTrue(remote_client.connected());
+  for(int i=0; i<4; i++) { broker.loop(); local_client.loop(); remote_client.loop(); };
+  assertEqual(broker.clientsCount(), (size_t) 2);
+  assertEqual(published.size(), (size_t)2);
+
+  // Remove the retained message now
+  local_client.publish("topic", "", true);
+  assertEqual(published.size(), (size_t)1);
+
+  // And reconnect the remote client
+  remote_client.connect(broker_ip, 1883);
+  for(int i=0; i<4; i++) { broker.loop(); local_client.loop(); remote_client.loop(); };
+  assertEqual(broker.clientsCount(), (size_t) 2);
+
+  // check that the message was received
+  assertEqual(published.size(), (size_t)2);
+}
+
+test(retained_payload)  // # issue #84
+{
+  published.clear();
+
+  start_many_wifi_esp(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  broker.retain(10);
+  IPAddress broker_ip = WiFi.localIP();
+
+  MqttClient local_client(&broker, "sender");
+
+  // Send a retained message
+  // No remote client connected
+  local_client.publish("topic", "retained", true);
+  for(int i=0; i<2; i++) { broker.loop(); local_client.loop(); };
+
+  // No connect a client from 2nd Esp
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient remote_client("receiver");
+  remote_client.connect(broker_ip, 1883);
+  remote_client.setCallback(onPublish);
+  remote_client.subscribe("#");
+
+  assertTrue(remote_client.connected());
+  for(int i=0; i<10; i++) { broker.loop(); local_client.loop(); remote_client.loop(); };
+
+  // Check that the retained message is published
+  assertEqual(lastPayload, "retained");
+}
+
+test(remote_client_disconnect_reconnect)
+{
+  published.clear();
+  start_many_wifi_esp(2, true);
+  assertEqual(WiFi.status(), WL_CONNECTED);
+
+  MqttBroker broker(1883);
+  broker.begin();
+  IPAddress broker_ip = WiFi.localIP();
+
+  ESP8266WiFiClass::selectInstance(2);
+  MqttClient client;
+  client.connect(broker_ip, 1883);
+
+  for(int i=0; i<4; i++) { broker.loop(); client.loop(); };
+  assertEqual(broker.clientsCount(), (size_t) 1);
+
+  // Disconnect the client
+  client.close();
+  for(int i=0; i<4; i++) { broker.loop(); client.loop(); };
+  assertEqual(broker.clientsCount(), (size_t) 0);
+
+  // Reconnect the client
+  client.connect(broker_ip, 1883);
+  for(int i=0; i<4; i++) { broker.loop(); client.loop(); };
+  assertEqual(broker.clientsCount(), (size_t) 1);
+}
+
+test(client_to_broker_connexion)
+{
+  start_many_wifi_esp(2, true);
   assertEqual(WiFi.status(), WL_CONNECTED);
 
   MqttBroker broker(1883);
@@ -158,9 +428,9 @@ test(network_client_to_broker_connexion)
   assertTrue(client.connected());
 }
 
-test(network_one_client_one_broker_publish_and_subscribe_through_network)
+test(one_client_one_broker_publish_and_subscribe)
 {
-  start_servers(2, true);
+  start_many_wifi_esp(2, true);
   published.clear();
   assertEqual(WiFi.status(), WL_CONNECTED);
 
@@ -189,9 +459,9 @@ test(network_one_client_one_broker_publish_and_subscribe_through_network)
   assertEqual((int)lastLength, (int)2); // sizeof(ab)
 }
 
-test(network_one_client_one_broker_hudge_publish_and_subscribe_through_network)
+test(one_client_one_broker_hudge_payload)
 {
-  start_servers(2, true);
+  start_many_wifi_esp(2, true);
   published.clear();
   assertEqual(WiFi.status(), WL_CONNECTED);
 
@@ -208,8 +478,8 @@ test(network_one_client_one_broker_hudge_publish_and_subscribe_through_network)
 
   std::string sent;
 
-  for(int i=0; i<200; i++)
+  for(int i=0; i<400; i++)
-    sent += char('0'+i%10);
+    sent += char('a'+i%26);
 
   client.setCallback(onPublish);
   client.subscribe("a/b");
@@ -225,7 +495,7 @@ test(network_one_client_one_broker_hudge_publish_and_subscribe_through_network)
   assertEqual((unsigned int)lastLength, (unsigned int)sent.size());
 }
 
-test(network_client_should_unregister_when_destroyed)
+test(client_should_unregister_when_destroyed)
 {
   assertEqual(broker.clientsCount(), (size_t)0);
   {
@@ -239,7 +509,7 @@ test(network_client_should_unregister_when_destroyed)
 // THESE TESTS ARE IN LOCAL MODE
 // WE HAVE TO CONVERT THEM TO WIFI MODE (pass through virtual TCP link)
 
-test(network_connect)
+test(connect)
 {
   assertEqual(broker.clientsCount(), (size_t)0);
 
@@ -248,7 +518,7 @@ test(network_connect)
   assertEqual(broker.clientsCount(), (size_t)1);
 }
 
-test(network_publish_should_be_dispatched)
+test(publish_should_be_dispatched)
 {
   published.clear();
   assertEqual(broker.clientsCount(), (size_t)0);
@@ -264,11 +534,11 @@ test(network_publish_should_be_dispatched)
   publisher.publish("a/c");
 
   assertEqual(published.size(), (size_t)1);  // 1 client has received something
-	assertEqual(published[""]["a/b"], 1);
+  assertEqual(published[TINY_MQTT_DEFAULT_CLIENT_ID]["a/b"], 1);
-	assertEqual(published[""]["a/c"], 2);
+  assertEqual(published[TINY_MQTT_DEFAULT_CLIENT_ID]["a/c"], 2);
 }
 
-test(network_publish_should_be_dispatched_to_clients)
+test(publish_should_be_dispatched_to_clients)
 {
   published.clear();
   assertEqual(broker.clientsCount(), (size_t)0);
@@ -293,7 +563,7 @@ test(network_publish_should_be_dispatched_to_clients)
   assertEqual(published["B"]["a/c"], 0);
 }
 
-test(network_unsubscribe)
+test(unsubscribe)
 {
   published.clear();
   assertEqual(broker.clientsCount(), (size_t)0);
@@ -310,10 +580,10 @@ test(network_unsubscribe)
   publisher.publish("a/b");    // Those one, no (unsubscribed)
   publisher.publish("a/b");
 
-	assertEqual(published[""]["a/b"], 1);	// Only one publish has been received
+  assertEqual(published[TINY_MQTT_DEFAULT_CLIENT_ID]["a/b"], 1);  // Only one publish has been received
 }
 
-test(network_nocallback_when_destroyed)
+test(nocallback_when_destroyed)
 {
   published.clear();
   assertEqual(broker.clientsCount(), (size_t)0);
@@ -332,7 +602,7 @@ test(network_nocallback_when_destroyed)
   assertEqual(published.size(), (size_t)1);  // Only one publish has been received
 }
 
-test(network_small_payload)
+test(small_payload)
 {
   published.clear();
 
@@ -350,7 +620,7 @@ test(network_small_payload)
   assertEqual(lastLength, (size_t)4);
 }
 
-test(network_hudge_payload)
+test(hudge_payload)
 {
   const char* payload="This payload is hudge, just because its length exceeds 127. Thus when encoding length, we have to encode it on two bytes at min. This should not prevent the message from being encoded and decoded successfully !";
 
@@ -367,6 +637,20 @@ test(network_hudge_payload)
   assertEqual(strcmp(payload, lastPayload), 0);
 }
 
+test(disconnected_when_broker_is_deleted)
+{
+  MqttBroker* broker = new MqttBroker(1883);
+  broker->begin();
+
+  MqttClient client;
+  client.connect(broker);
+  assertEqual(client.connected(), true);
+  client.publish("a", "b");
+
+  delete broker;
+  assertEqual(client.connected(), false);
+}
+
 test(connack)
 {
   const bool view = false;
@@ -383,7 +667,7 @@ test(connack)
     }
   );
 
-  start_servers(2, true);
+  start_many_wifi_esp(2, true);
   assertEqual(WiFi.status(), WL_CONNECTED);
 
   MqttBroker broker(1883);
@@ -416,7 +700,7 @@ void setup() {
   while(!Serial);
   */
 
-	Serial.println("=============[ FAKE NETWORK TinyMqtt TESTS       ]========================");
+  Serial.println("=============[ NETWORK TinyMqtt TESTS       ]========================");
 
   WiFi.mode(WIFI_STA);
   WiFi.begin("network", "password");
@@ -426,4 +710,5 @@ void loop() {
   aunit::TestRunner::run();
 
   if (Serial.available()) ESP.reset();
+  published.clear();  // Avoid crash in unit tests due to exit handlers
 }

tests/nowifi-tests/Makefile

@@ -1,13 +1,10 @@
 # See https://github.com/bxparks/EpoxyDuino for documentation about this
 # Makefile to compile and run Arduino programs natively on Linux or MacOS.
 
-EXTRA_CXXFLAGS=-g3 -O0
+include ../Makefile.opts
-
-# Remove flto flag from EpoxyDuino (too many <optimized out>)
-CXXFLAGS = -Wextra -Wall -std=gnu++11 -fno-exceptions -fno-threadsafe-statics
 
 APP_NAME := nowifi-tests
-ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsyncTCP TinyConsole
 ARDUINO_LIB_DIRS := ../../../EspMock/libraries
 EPOXY_CORE := EPOXY_CORE_ESP8266
 include ../../../EpoxyDuino/EpoxyDuino.mk

tests/nowifi-tests/nowifi-tests.ino

@@ -1,3 +1,4 @@
+// vim: ts=2 sw=2 expandtab
 #include <Arduino.h>
 #include <AUnit.h>
 #include <TinyMqtt.h>
@@ -10,11 +11,11 @@
   * Checks with a local broker. Clients must connect to the local broker
   **/
 
-using namespace std;
+using string = TinyConsole::string;
 
 MqttBroker broker(1883);
 
-std::map<std::string, std::map<Topic, int>>	published;		// map[client_id] => map[topic] = count
+std::map<string, std::map<Topic, int>>  published;    // map[client_id] => map[topic] = count
 
 char* lastPayload = nullptr;
 size_t lastLength;
@@ -64,8 +65,8 @@ test(nowifi_publish_should_be_dispatched)
   publisher.publish("a/c");
 
   assertEqual(published.size(), (size_t)1);  // 1 client has received something
-	assertEqual(published[""]["a/b"], 1);
+  assertEqual(published[TINY_MQTT_DEFAULT_CLIENT_ID]["a/b"], 1);
-	assertEqual(published[""]["a/c"], 2);
+  assertEqual(published[TINY_MQTT_DEFAULT_CLIENT_ID]["a/c"], 2);
 }
 
 test(nowifi_publish_should_be_dispatched_to_clients)
@@ -208,7 +209,7 @@ test(nowifi_unsubscribe)
   publisher.publish("a/b");    // Those one, no (unsubscribed)
   publisher.publish("a/b");
 
-	assertEqual(published[""]["a/b"], 1);	// Only one publish has been received
+  assertEqual(published[TINY_MQTT_DEFAULT_CLIENT_ID]["a/b"], 1);  // Only one publish has been received
 }
 
 test(nowifi_nocallback_when_destroyed)
@@ -278,4 +279,5 @@ void loop() {
   aunit::TestRunner::run();
 
   if (Serial.available()) ESP.reset();
+  published.clear();  // Avoid crash at exit handlers
 }

tests/string-indexer-tests/Makefile

@@ -1,10 +1,10 @@
 # See https://github.com/bxparks/EpoxyDuino for documentation about this
 # Makefile to compile and run Arduino programs natively on Linux or MacOS.
 
-EXTRA_CXXFLAGS=-g3 -O0
+include ../Makefile.opts
 
 APP_NAME := string-indexer-tests
-ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsync
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsync TinyConsole
 ARDUINO_LIB_DIRS := ../../../EspMock/libraries
 EPOXY_CORE := EPOXY_CORE_ESP8266
 include ../../../EpoxyDuino/EpoxyDuino.mk

tests/string-indexer-tests/string-indexer-tests.ino

@@ -1,3 +1,4 @@
+// vim: ts=2 sw=2 expandtab
 #include <Arduino.h>
 #include <AUnit.h>
 #include <StringIndexer.h>
@@ -8,7 +9,7 @@
   *
   **/
 
-using namespace std;
+using string = TinyConsole::string;
 
 test(indexer_empty)
 {
@@ -83,7 +84,7 @@ test(indexer_indexed_operator_eq)
 
 test(indexer_get_string)
 {
-	std::string sone("one");
+  string sone("one");
   IndexedString one(sone);
 
   assertTrue(sone==one.str());

tests/topic-tests/Makefile

@@ -1,10 +1,10 @@
 # See https://github.com/bxparks/EpoxyDuino for documentation about this
 # Makefile to compile and run Arduino programs natively on Linux or MacOS.
 
-EXTRA_CXXFLAGS=-g3 -O0
+include ../Makefile.opts
 
 APP_NAME := topic-tests
-ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsync
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock ESP8266WiFi  ESPAsync TinyConsole
 ARDUINO_LIB_DIRS := ../../../EspMock/libraries
 EPOXY_CORE := EPOXY_CORE_ESP8266
 include ../../../EpoxyDuino/EpoxyDuino.mk

tests/topic-tests/topic-tests.ino

@@ -1,29 +1,26 @@
+// vim: ts=2 sw=2 expandtab
 #include <Arduino.h>
 #include <AUnit.h>
 #include <TinyMqtt.h>
 #include <map>
 #include <iostream>
 
-#define endl "\n"
-
 /**
   * TinyMqtt / StringIndexer unit tests.
   *
   **/
 
-using namespace std;
-
 bool testTopicMatch(const char* a, const char* b, bool expected)
 {
   Topic ta(a);
   Topic tb(b);
   bool match(ta.matches(tb));
-  cout << "  " << ta.c_str() << ' ';
+  std::cout << "  " << ta.c_str() << ' ';
   if (match != expected)
-    cout << (expected ? " should match " : " should not match ");
+    std::cout << (expected ? " should match " : " should not match ");
   else
-    cout << (expected ? " matches " : " unmatches ");
+    std::cout << (expected ? " matches " : " unmatches ");
-  cout << tb.c_str() << endl;
+  std::cout << tb.c_str() << std::endl;
   return expected == match;
 }