Hass discovery improvments (#512)

Rename set commands to config
correct json buffer size and gateway name
replace state to cmd
replace set by config
add restart and erase command
add unicity to gateway command switches
BLE devices shouldn't be child of the gateway
make the BTtoMQTT topic consistent with other definitions

main/main.ino

@@ -296,7 +296,7 @@ void trc(JsonObject &data)
 void pub(char *topicori, char *payload, bool retainFlag)
 {
   String topic = String(mqtt_topic) + String(topicori);
-  client.publish((char *)topic.c_str(), payload, retainFlag);
+  pubMQTT((char *)topic.c_str(), payload, retainFlag);
 }
 
 void pub(char *topicori, JsonObject &data)
@@ -502,7 +502,6 @@ bool cmpToMainTopic(char * topicOri, char * toAdd){
   }
 }
 
-
 void reconnect()
 {
 
@@ -516,7 +515,10 @@ void reconnect()
   while (!client.connected())
   {
     trc(F("MQTT connection...")); //F function enable to decrease sram usage
-    if (client.connect(gateway_name, mqtt_user, mqtt_pass, will_Topic, will_QoS, will_Retain, will_Message))
+    char topic[mqtt_topic_max_size];
+    strcpy(topic,mqtt_topic);
+    strcat(topic,will_Topic);
+    if (client.connect(gateway_name, mqtt_user, mqtt_pass, topic, will_QoS, will_Retain, will_Message))
     {
       trc(F("Connected to broker"));
       failure_number = 0;
@@ -525,10 +527,10 @@ void reconnect()
       // publish version
       pub(version_Topic, OMG_VERSION, will_Retain);
       //Subscribing to topic
-      char topic[mqtt_topic_max_size];
-      strcpy(topic,mqtt_topic);
-      strcat(topic,subjectMQTTtoX);
-      if (client.subscribe(topic))
+      char topic2[mqtt_topic_max_size];
+      strcpy(topic2,mqtt_topic);
+      strcat(topic2,subjectMQTTtoX);
+      if (client.subscribe(topic2))
       {
         #ifdef ZgatewayRF
         client.subscribe(subjectMultiGTWRF); // subject on which other OMG will publish, this OMG will store these msg and by the way don't republish them if they have been already published