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>

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]