Setmqtt setting optional (#1021)

* Define MQTTsetMQTT for configuring MQTT over MQTT

* Enable MQTTsetMQTT per default on all ESP except RFBridge

Co-authored-by: Dave <d.kneisz@gmail.com>

docs/use/gateway.md

@@ -52,6 +52,17 @@ mosquitto_pub -t "home/OpenMQTTGateway/commands/MQTTtoSYS/config" -m
   "mqtt_secure": "false"
 }'
 ```
+::: info
+By default this function is not available on the pre built binary of RFBridge, in order to have less code size and enable to have OTA update working properly. So as to enable it remove from the rf bridge env:
+```
+build_flags = '-UMQTTsetMQTT'
+``` 
+Arduino boards does not have this function per default also, to add it:
+```
+build_flags = '-DMQTTsetMQTT'
+``` 
+:::
+
 ::: tip
 Server, port, and secure_flag are only required if changing connection to another broker.  
 If the new connection fails the gateway will fallback to the previous connection.

main/main.ino

@@ -1897,6 +1897,7 @@ void MQTTtoSYS(char* topicOri, JsonObject& SYSdata) { // json object decoding
 #  endif
     }
 
+#  ifdef MQTTsetMQTT
     if (SYSdata.containsKey("mqtt_user") && SYSdata.containsKey("mqtt_pass")) {
       bool update_server = false;
       bool secure_connect = SYSdata.get<bool>("mqtt_secure");
@@ -1909,7 +1910,7 @@ void MQTTtoSYS(char* topicOri, JsonObject& SYSdata) { // json object decoding
           Log.error(F("mqtt_server provided without mqtt_secure defined - ignoring command" CR));
           return;
         }
-#  if MQTT_SECURE_SELF_SIGNED
+#    if MQTT_SECURE_SELF_SIGNED
         if (use_ss_cert) {
           cert_index = SYSdata.get<uint8_t>("mqtt_cert_index");
           if (cert_index >= sizeof(certs_array) / sizeof(ss_certs)) {
@@ -1917,11 +1918,11 @@ void MQTTtoSYS(char* topicOri, JsonObject& SYSdata) { // json object decoding
             return;
           }
         }
-#  endif
+#    endif
 
-#  if defined(ZgatewayBT) && defined(ESP32)
+#    if defined(ZgatewayBT) && defined(ESP32)
         stopProcessing();
-#  endif
+#    endif
         client.disconnect();
         update_server = true;
         if (secure_connect != mqtt_secure) {
@@ -1942,9 +1943,9 @@ void MQTTtoSYS(char* topicOri, JsonObject& SYSdata) { // json object decoding
 
         client.setServer(SYSdata.get<const char*>("mqtt_server"), SYSdata.get<unsigned int>("mqtt_port"));
       } else {
-#  if defined(ZgatewayBT) && defined(ESP32)
+#    if defined(ZgatewayBT) && defined(ESP32)
         stopProcessing();
-#  endif
+#    endif
         client.disconnect();
       }
 
@@ -1965,9 +1966,9 @@ void MQTTtoSYS(char* topicOri, JsonObject& SYSdata) { // json object decoding
             delete prev_client;
           }
         }
-#  ifndef ESPWifiManualSetup
+#    ifndef ESPWifiManualSetup
         saveMqttConfig();
-#  endif
+#    endif
       } else {
         if (update_server) {
           if (prev_client != nullptr) {
@@ -1985,10 +1986,11 @@ void MQTTtoSYS(char* topicOri, JsonObject& SYSdata) { // json object decoding
         }
         connectMQTT();
       }
-#  if defined(ZgatewayBT) && defined(ESP32)
+#    if defined(ZgatewayBT) && defined(ESP32)
       startProcessing();
-#  endif
+#    endif
     }
+#  endif
 #endif
 
 #ifdef ZmqttDiscovery

platformio.ini

@@ -153,6 +153,7 @@ build_flags =
   '-DTRACE=1'
   '-DCONFIG_BT_NIMBLE_ROLE_PERIPHERAL_DISABLED'
   '-DCONFIG_BT_NIMBLE_ROLE_BROADCASTER_DISABLED'
+  '-DMQTTsetMQTT'
   ;'-DCORE_DEBUG_LEVEL=4'
 
 [com-arduino]
@@ -190,6 +191,7 @@ build_flags =
   '-DLED_INFO=13'
   '-DLED_INFO_ON=0'
   '-DGateway_Name="OpenMQTTGateway_SRFB"'
+  '-UMQTTsetMQTT' ;We remove this function to have sufficient FLASH available for OTA, you should also use ESPWifiManualSetup to save flash memory and have OTA working
 board_build.flash_mode = dout
 
 [env:esp32dev-all-test]