[Retain] Fix bug in last retained msg and add retain commands to tinytests

examples/tinymqtt-test/tinymqtt-test.ino

@@ -448,6 +448,10 @@ void eval(string &cmd)
         Console << "  " << fb.first << " : " << fb.second.url << ":" << fb.second.port << endl;
       }
     }
+    else if (compare(s, "free"))
+    {
+      Console << "Free memory: " << ESP.getFreeHeap() << endl;
+    }
     else if (compare(s, "delete"))
     {
       if (client == nullptr && broker == nullptr)
@@ -497,7 +501,22 @@ void eval(string &cmd)
     {
       if (compare(s, "connect"))
       {
-        Console << "NYI" << endl;
+        string remote = getword(cmd);
+        int port = getint(cmd);
+        if (port == 0) port=1883;
+        broker->connect(remote, port);
+        if (broker->connected())
+          Console << "Broker connected";
+        else
+          Console << red << "Unable to connect";
+
+        Console << " to " << remote << ':' << port << white << endl;
+      }
+      else if (compare(s, "retain"))
+      {
+        if (cmd.size())
+          broker->retain(getint(cmd));
+        Console << "retain=" << broker->retain() << ", retained msg=" << broker->retainCount() << endl;
       }
       else if (compare(s, "view"))
       {
@@ -515,6 +534,10 @@ void eval(string &cmd)
       {
         clientConnect(client, cmd);
       }
+      else if (compare(s, "rpublish"))
+      {
+        retval = client->publish(getword(cmd), getword(cmd), true);
+      }
       else if (compare(s, "publish"))
       {
         retval = client->publish(getword(cmd), getword(cmd));
@@ -760,7 +783,8 @@ void eval(string &cmd)
         Console << save_cursor << magenta;
         Console.gotoxy(1, 1);
       }
-      Console << "--< " << '/' << clients.size() << " client/s. >--" << erase_to_end << endl;
+      Console << "--< " << '/' << clients.size() << " client/s. >--" << erase_to_end;
+      Console << "    (FreeMem: " << ESP.getFreeHeap() << ')' << endl;
       for (auto it : clients)
       {
         it.second->dump("  ");
@@ -786,19 +810,22 @@ void eval(string &cmd)
     {
       Console << "syntax:" << endl;
       Console << "  MqttBroker:" << endl;
-      Console << "    broker {broker_name} {port} : create a new broker" << endl;
-      Console << "      broker_name can be one of 'list'" << endl;
-      Console << "      broker_name.delete : delete a broker (buggy)" << endl;
-      Console << "      broker_name.view   : dump a broker" << endl;
+      Console << "    broker {name} {port} : create a new broker" << endl;
+      Console << "      name can be one of 'list'" << endl;
+      Console << "      name.delete     : delete a broker (buggy)" << endl;
+      Console << "      name.retain [#] : show/set retain value" << endl;
+      Console << "      name.view       : dump a broker" << endl;
       Console << endl;
       Console << "  MqttClient:" << endl;
       Console << "    client {name} {broker} : create a client then" << endl;
       Console << "      name.connect  [ip] [port] [alive]" << endl;
       Console << "      name.[un]subscribe topic" << endl;
       Console << "      name.publish topic [payload]" << endl;
+      Console << "      name.rpublish topic [payload] : publish a retained message" << endl;
       Console << "      name.view" << endl;
       Console << "      name.delete" << endl;
       Console << endl;
+      Console << "  free : view free mem" << endl;
       Console << "  list : list of free brokers (debug 1 advised)" << endl;
       Console << "  debug #" << endl;
       Console << "  list : get list of free brokers" << endl;

src/TinyMqtt.cpp

@@ -957,14 +957,19 @@ void MqttBroker::retainDrop()
 
 void MqttBroker::retain(const Topic& topic, const MqttMessage& msg)
 {
-  debug("MqttBroker::retain msg_type=" << _HEX(msg.type()));
+  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());
-    if (retained.find(topic) == retained.end()) retainDrop();
+    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)});
   }
 }

src/TinyMqtt.h

@@ -133,6 +133,7 @@ class MqttMessage
     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();
 
@@ -346,7 +347,9 @@ class MqttBroker
     bool connected() const { return remote_broker ? remote_broker->connected() : false; }
 
     size_t clientsCount() const { return clients.size(); }
-    void retain(uint8_t size) { retain_size = 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(string indent="")
     {