Minor change to publish

.gitignore

@@ -1 +1,2 @@
 *~
+src/my_credentials.h

README.md

@@ -23,16 +23,16 @@ ESP 8266 is a small and very capable Mqtt Broker and Client
 * Implement zeroconf mode (needs async)
 * Add a max_clients in MqttBroker. Used with zeroconf, there will be
 no need for having tons of clients (also RAM is the problem with many clients)
-* Test what is the real max number of clients for broker. As far as I saw, 3k is needed per client which would make more than 10 clients critical.
+* Test what is the real max number of clients for broker. As far as I saw, 1k is needed per client which would make more than 30 clients critical.
-* MqttMessage uses a buffer 256 bytes which is usually far than needed.
+* ~~MqttMessage uses a buffer 256 bytes which is usually far than needed.~~
-* MqttClient auto reconnection
+* ~~MqttClient does not support more than one subscription at time~~
 * MqttClient auto re-subscribe
+* MqttClient auto reconnection
 * MqttClient does not callback payload...
 * MqttClient user/password
 
 ## Quickstart
 
-* install [Streaming library](https://github.com/janelia-arduino/Streaming)
 * install [TinyMqtt library](https://github.com/hsaturn/TinyMqtt)
 * modify <libraries/TinyMqtt/src/my_credentials.h> (wifi setup)
 

examples/client-with-wifi/client-with-wifi.ino

@@ -1,5 +1,4 @@
 #include <TinyMqtt.h>   // https://github.com/hsaturn/TinyMqtt
-#include <Streaming.h>  // https://github.com/janelia-arduino/Streaming
 
 /** 
   * Local broker that accept connections and two local clients

examples/client-without-wifi/client-without-wifi.ino

@@ -1,5 +1,4 @@
 #include <TinyMqtt.h>   // https://github.com/hsaturn/TinyMqtt
-#include <Streaming.h>  // https://github.com/janelia-arduino/Streaming
 
 /** TinyMQTT allows a disconnected mode:
  * 
@@ -15,10 +14,10 @@ MqttBroker broker(1883);
 MqttClient mqtt_a(&broker);
 MqttClient mqtt_b(&broker);
 
-void onPublishA(const Topic& topic, const char* payload, size_t length)
+void onPublishA(const MqttClient* srce, const Topic& topic, const char* payload, size_t length)
 { Serial << "--> A Received " << topic.c_str() << endl; }
 
-void onPublishB(const Topic& topic, const char* payload, size_t length)
+void onPublishB(const MqttClient* srce, const Topic& topic, const char* payload, size_t length)
 { Serial << "--> B Received " << topic.c_str() << endl; }
 
 void setup()

examples/simple-broker/simple-broker.ino

@@ -1,5 +1,4 @@
 #include "TinyMqtt.h"   // https://github.com/hsaturn/TinyMqtt
-#include <Streaming.h>  // https://github.com/janelia-arduino/Streaming
 
 #include <my_credentials.h>
 

examples/simple-client/simple-client.ino

@@ -1,6 +1,5 @@
 #include <ESP8266WiFi.h>
 #include "TinyMqtt.h"   // https://github.com/hsaturn/TinyMqtt
-#include <Streaming.h>  // https://github.com/janelia-arduino/Streaming
 
 /** Simple Client
   *
@@ -43,7 +42,11 @@ void loop()
 
 	delay(1000);
 
-	temp += (random(100)>50 ? 0.1 : -0.1);
+	auto rnd=random(100);
+
+	if (rnd > 66) temp += 0.1;
+	else if (rnd < 33) temp -= 0.1;
+
 	client.publish("sensor/temperature", String(temp));
 
 }

examples/tinymqtt-test/commands.txt

@@ -0,0 +1,11 @@
+// vim: ts=30
+Exemple of commands that can be sent via the serial monitor to tinymqtt-test
+----------------------------------------------------------------------------
+
+client a	starts a client (not connected no internal broker)
+a.connect [server][port][alive]	connects the client, default port=1883
+a.publish topic [payload]	send a topic with a payload
+a.subscribe topic	subscribes to a topic
+delete a	destroy the client
+
+

examples/tinymqtt-test/tinymqtt-test.ino

@@ -1,6 +1,6 @@
 #define TINY_MQTT_DEBUG
 #include <TinyMqtt.h>       // https://github.com/hsaturn/TinyMqtt
-#include <Streaming.h>  // https://github.com/janelia-arduino/Streaming
+#include <MqttStreaming.h>
 #include <map>
 
 /** 
@@ -54,15 +54,15 @@ void setup()
 	brokers["broker"] = broker;
 }
 
-int getint(std::string& str, const int if_empty=0, char sep=' ')
+int getint(std::string& str, const int if_empty=0)
 {
 	std::string sword;
-	while(str.length() && str[0]!=sep)
+	while(str.length() && str[0]>='0' && str[0]<='9')
 	{
 		sword += str[0]; str.erase(0,1);
 	}
-	while(str[0]==sep) str.erase(0,1);
+	while(str[0]==' ') str.erase(0,1);
-	if (if_empty and sword.length()==0) sword=if_empty;
+	if (if_empty and sword.length()==0) return if_empty;
 	return atoi(sword.c_str());
 }
 
@@ -78,6 +78,7 @@ std::string getword(std::string& str, const char* if_empty=nullptr, char sep=' '
 	return sword;
 }
 
+// publish at regular interval
 class automatic
 {
 	public:
@@ -189,6 +190,7 @@ class automatic
 		std::string topic_;
 		bool bon=false;
 		static std::map<MqttClient*, automatic*> autos;
+		float temp=19;
 };
 std::map<MqttClient*, automatic*> automatic::autos;
 
@@ -225,6 +227,8 @@ void loop()
 				last_cmd=cmd;
 			while(cmd.length())
 			{
+				MqttError retval = MqttOk;
+
 				std::string s;
 				MqttBroker* broker = nullptr;
 				MqttClient* client = nullptr;
@@ -309,16 +313,14 @@ void loop()
 				{
 					if (compare(s,"connect"))
 					{
-						client->connect(getword(cmd,"192.168.1.40").c_str(), 1883);
+						client->connect(getword(cmd,"192.168.1.40").c_str(), getint(cmd, 1883), getint(cmd, 60));
 						Serial << (client->connected() ? "connected." : "not connected") << endl;
 					}
 					else if (compare(s,"publish"))
 					{
-						auto ok=client->publish(getword(cmd, topic.c_str()));
+						while (cmd[0]==' ') cmd.erase(0,1);
-						if (ok != MqttOk)
+						retval = client->publish(getword(cmd, topic.c_str()), cmd.c_str(), cmd.length());
-						{
+						cmd="";	// remove payload
-							Serial << "## ERROR " << ok << endl;
-						}
 					}
 					else if (compare(s,"subscribe"))
 					{
@@ -409,9 +411,9 @@ void loop()
 					Serial << endl;
 					Serial << "  MqttClient:" << endl;
 					Serial << "    client {name} {parent broker} : create a client then" << endl;
-					Serial << "      name.connect  [ip]" << endl;
+					Serial << "      name.connect  [ip] [port] [alive]" << endl;
 					Serial << "      name.subscribe [topic]" << endl;
-					Serial << "      name.publish [topic]" << endl;
+					Serial << "      name.publish [topic][payload]" << endl;
 					Serial << "      name.view" << endl;
 					Serial << "      name.delete" << endl;
 
@@ -431,6 +433,11 @@ void loop()
 					if (s.length())
 						Serial << "Unknown command (" << s.c_str() << ")" << endl;
 				}
+
+				if (retval != MqttOk)
+				{
+					Serial << "## ERROR " << retval << endl;
+				}
 			}
 		}
 		else

src/MqttStreaming.h

@@ -0,0 +1,412 @@
+/* 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
+*/
+
+#ifndef ARDUINO_STREAMING
+#define ARDUINO_STREAMING
+
+#if defined(ARDUINO) && ARDUINO >= 100
+#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
+// 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.h

@@ -2,7 +2,6 @@
 #include <map>
 #include <string>
 #include <string.h>
-// #include <Streaming.h>
 #include <ESP8266WiFi.h>
 
 /***

src/TinyMqtt.cpp

@@ -1,6 +1,5 @@
 #include "TinyMqtt.h"
 #include <sstream>
-#include <Streaming.h>
 
 void outstring(const char* prefix, const char*p, uint16_t len)
 {
@@ -60,7 +59,7 @@ void MqttClient::close()
 	}
 }
 
-void MqttClient::connect(std::string broker, uint16_t port)
+void MqttClient::connect(std::string broker, uint16_t port, uint16_t ka)
 {
 	debug("cnx: closing");
 	close();
@@ -75,13 +74,15 @@ void MqttClient::connect(std::string broker, uint16_t port)
 		message.add(0x4);	// Mqtt protocol version 3.1.1
 		message.add(0x0);	// Connect flags         TODO user / name
 
-		keep_alive = 1;			// TODO not configurable
+		keep_alive = ka;			// TODO not configurable
 		message.add(0x00); // keep_alive
 		message.add((char)keep_alive);
 		message.add(clientId);
 	  debug("cnx: mqtt connecting");
 		message.sendTo(this);
+		message.reset();
 	  debug("cnx: mqtt sent " << (int32_t)parent);
+
 		clientAlive(0);
 	}
 }
@@ -146,16 +147,19 @@ MqttError MqttBroker::publish(const MqttClient* source, const Topic& topic, Mqtt
 	{
 		i++;
 		Serial << "brk_" << (broker && broker->connected() ? "con" : "dis") <<
-			 "	srce=" << (source->isLocal() ? "loc" : "rem") << " clt#" << i << ", local=" << client->isLocal() << ", con=" << client->connected();
+			 "	srce=" << (source->isLocal() ? "loc" : "rem") << " clt#" << i << ", local=" << client->isLocal() << ", con=" << client->connected() << endl;
 		bool doit = false;
-		if (broker && broker->connected())	// Connected: R2 R3 R5 R6
+		if (broker && broker->connected())	// Broker is connected
 		{
 			//    ext broker -> clients or
 			// or clients -> ext broker
 			if (source == broker)	// broker -> clients
 				doit = true;
 			else									// clients -> broker
-				retval=broker->publish(topic, msg);
+			{
+				MqttError ret = broker->publish(topic, msg);
+				if (ret != MqttOk) retval = ret;
+			}
 		}
 		else // Disconnected: R7
 		{
@@ -164,7 +168,7 @@ MqttError MqttBroker::publish(const MqttClient* source, const Topic& topic, Mqtt
 		}
 		Serial << ", doit=" << doit << ' ';
 
-		if (doit) client->publish(topic, msg);
+		if (doit) retval = client->publish(topic, msg);
 		debug("");
 	}
 	return retval;
@@ -208,6 +212,7 @@ void MqttClient::loop()
 		}
 		else if (client && client->connected())
 		{
+			debug("pingreq");
 			uint16_t pingreq = MqttMessage::Type::PingReq;
 			client->write((uint8_t*)(&pingreq), 2);
 			clientAlive(0);
@@ -227,11 +232,40 @@ void MqttClient::loop()
 	}
 }
 
+MqttError MqttClient::subscribe(Topic topic, uint8_t qos)
+{
+	debug("subsribe(" << topic.c_str() << ")");
+	MqttError ret = MqttOk;
+
+ 	subscriptions.insert(topic);
+
+	if (parent==nullptr) // remote broker ?
+	{
+		debug("remote subscribe");
+		MqttMessage msg(MqttMessage::Type::Subscribe, 2);
+
+		// TODO manage packet identifier
+		msg.add(0);
+		msg.add(0);
+		
+		msg.add(topic.str());
+		msg.add(qos);
+		ret = msg.sendTo(this);
+		
+		// TODO we should wait (state machine) for SUBACK
+	}
+	return ret;
+}
+
 void MqttClient::processMessage()
 {
 	std::string error;
 	std::string s;
-	// Serial << "---> INCOMING " << _HEX(message.type()) << ", mem=" << ESP.getFreeHeap() << endl;
+if (message.type() != MqttMessage::Type::PingReq && message.type() != MqttMessage::Type::PingResp)
+{
+	Serial << "---> INCOMING " << _HEX(message.type()) << " client(" << (int)client << ':' << clientId << ") mem=" << ESP.getFreeHeap() << endl;
+	message.hexdump("Incoming");
+}
   auto header = message.getVHeader();
   const char* payload;
   uint16_t len;
@@ -312,6 +346,24 @@ void MqttClient::processMessage()
 			message.sendTo(this);
 			break;
 
+		case MqttMessage::Type::Connack:
+			// TODO what more on connack ?
+			mqtt_connected = true;
+			bclose = false;
+			break;
+
+		case MqttMessage::Type::Suback:
+		case MqttMessage::Type::Puback:
+			if (!mqtt_connected) break;
+			// Ignore acks
+			bclose = false;
+			break;
+
+		case MqttMessage::Type::PingResp:
+			// TODO: no PingResp is suspicious (server dead)
+			bclose = false;
+			break;
+
 		case MqttMessage::Type::PingReq:
 			if (!mqtt_connected) break;
 			if (client)
@@ -327,14 +379,26 @@ void MqttClient::processMessage()
 			break;
 
 		case MqttMessage::Type::Subscribe:
+			{
 				if (!mqtt_connected) break;
 				payload = header+2;
-			message.getString(payload, len);	// Topic
-			outstring("Subscribes", payload, len);
 				
-			subscribe(Topic(payload, len));
+				debug("subscribe loop");
+				while(payload < message.end())
+				{
+					message.getString(payload, len);	// Topic
+					debug( "  topic (" << std::string(payload, len) << ')');
+					outstring("Subscribes", payload, len);
+					// subscribe(Topic(payload, len));
+					subscriptions.insert(Topic(payload, len));
+					payload += len;
+					uint8_t qos = *payload++;
+					debug("  qos=" << qos);
+				}
+				debug("end loop");
 				bclose = false;
 				// TODO SUBACK
+			}
 			break;
 
 		case MqttMessage::Type::Publish:
@@ -351,8 +415,15 @@ void MqttClient::processMessage()
 				if (qos) payload+=2;	// ignore packet identifier if any
 				// TODO reset DUP
 				// TODO reset RETAIN
+				if (parent)
+				{
 				  debug("publishing to parent");
 					parent->publish(this, published, message);
+				}
+				else if (callback && subscriptions.find(published)!=subscriptions.end())
+				{
+					callback(this, published, nullptr, 0);	// TODO send the real payload
+				}
 				// TODO should send PUBACK
 				bclose = false;
 			}
@@ -376,7 +447,7 @@ void MqttClient::processMessage()
   }
 	else
 	{
-		clientAlive(5);
+		clientAlive(parent ? 5 : 0);
 	}
 	message.reset();
 }
@@ -398,7 +469,7 @@ MqttError MqttClient::publish(const Topic& topic, const char* payload, size_t pa
 	if (parent)
 		return parent->publish(this, topic, msg);
 	else if (client)
-		msg.sendTo(this);
+		return msg.sendTo(this);
 	else
 		return MqttNowhereToSend;
 }
@@ -417,7 +488,7 @@ MqttError MqttClient::publish(const Topic& topic, MqttMessage& msg)
 			Serial << " match/send";
 			if (client)
 			{
-				msg.sendTo(this);
+				retval = msg.sendTo(this);
 			}
 			else if (callback)
 			{
@@ -506,28 +577,58 @@ void MqttMessage::encodeLength(char* msb, int length)
 	} while (length);
 };
 
-void MqttMessage::sendTo(MqttClient* client)
+MqttError MqttMessage::sendTo(MqttClient* client)
 {
 	if (buffer.size()>2)
 	{
+		debug("sending " << buffer.size() << " bytes");
 		encodeLength(&buffer[1], buffer.size()-2);
-		// hexdump("snd");
+		hexdump("snd");
 		client->write(&buffer[0], buffer.size());
 	}
 	else
 	{
-		Serial << "??? Invalid send" << endl;
+		debug("??? Invalid send");
+		return MqttInvalidMessage;
 	}
+	return MqttOk;
 }
 
 void MqttMessage::hexdump(const char* prefix) const
 {
-	if (prefix) Serial << prefix << ' ';
+	uint16_t addr=0;
-	Serial << "size(" << buffer.size() << ") : ";
+	const int bytes_per_row = 8;
+	const char* hex_to_str = " | ";
+	const char* separator = hex_to_str;
+	const char* half_sep = " - ";
+	std::string ascii;
+
+	Serial << 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 (prefix) Serial << prefix << separator;
+			ascii.clear();
+		}
+		addr++;
 		if (chr<16) Serial << '0';
 		Serial << _HEX(chr) << ' ';
+
+		ascii += (chr<32 ? '.' : chr);
+		if (ascii.length() == (bytes_per_row/2)) ascii += half_sep;
 	}
+	if (ascii.length())
+	{
+		while(ascii.length() < bytes_per_row+strlen(half_sep))
+		{
+			Serial << "   ";	// spaces per hexa byte
+			ascii += ' ';
+		}
+		Serial << hex_to_str << ascii << separator;
+	}
+
 	Serial << endl;
 }

src/TinyMqtt.h

@@ -3,9 +3,11 @@
 #include <set>
 #include <string>
 #include "StringIndexer.h"
+#include <MqttStreaming.h>
+
+#define TINY_MQTT_DEBUG
 
 #ifdef TINY_MQTT_DEBUG
-  #include <Streaming.h>
   #define debug(what) { Serial << __LINE__ << ' ' << what << endl; delay(100); }
 #else
   #define debug(what) {}
@@ -15,6 +17,7 @@ enum MqttError
 {
 	MqttOk = 0,
 	MqttNowhereToSend=1,
+	MqttInvalidMessage=2,
 };
 
 class Topic : public IndexedString
@@ -42,6 +45,7 @@ class MqttMessage
 			Publish   = 0x30,
 			PubAck    = 0x40,
 			Subscribe = 0x80,
+			Suback    = 0x90,
 			PingReq   = 0xC0,
 			PingResp  = 0xD0,
 		};
@@ -57,7 +61,7 @@ class MqttMessage
 		};
 
 		MqttMessage() { reset(); }
-		MqttMessage(Type t) { create(t); }
+		MqttMessage(Type t, uint8_t bits_d3_d0=0) { create(t); buffer[0] |= bits_d3_d0; }
 		void incoming(char byte);
 		void add(char byte) { incoming(byte); }
 		void add(const char* p, size_t len, bool addLength=true );
@@ -87,7 +91,7 @@ class MqttMessage
 			size=0;
 			state=Create;
 		}
-		void sendTo(MqttClient*);
+		MqttError sendTo(MqttClient*);
 		void hexdump(const char* prefix=nullptr) const;
 
 	private:
@@ -120,7 +124,7 @@ class MqttClient
 		~MqttClient();
 
 		void connect(MqttBroker* parent);
-		void connect(std::string broker, uint16_t port);
+		void connect(std::string broker, uint16_t port, uint16_t ka=10);
 
 		bool connected() { return
 			(parent!=nullptr and client==nullptr) or
@@ -141,8 +145,8 @@ class MqttClient
 		MqttError publish(const Topic& t, const std::string& s) { return publish(t,s.c_str(),s.length());}
 		MqttError publish(const Topic& t) { return publish(t, nullptr, 0);};
 
-		void subscribe(Topic topic) { subscriptions.insert(topic); }
+		MqttError subscribe(Topic topic, uint8_t qos=0);
-		void unsubscribe(Topic& topic);
+		MqttError unsubscribe(Topic& topic);
 
 		// connected to local broker
 		// TODO seems to be useless
@@ -151,15 +155,21 @@ class MqttClient
 #ifdef TINY_MQTT_DEBUG
 		void dump()
 		{
+			uint32_t ms=millis();
 			Serial << "MqttClient (" << clientId.c_str() << ") p=" << (int32_t) parent
 				<< " c=" << (int32_t)client << (connected() ? " ON " : " OFF"); 
+			Serial << ", alive=" << (uint32_t)alive << '/' << ms << ", ka=" << keep_alive;
+			Serial << " cnx " << (client && client->connected());
 			Serial << " [";
+		  message.hexdump("entrant msg");
 			bool c=false;
 			for(auto s: subscriptions)
 			{
 				Serial << (c?", ": "")<< s.str().c_str();
 				c=true;
 			}
+
+			
 			Serial << "]" << endl;
 		}
 #endif