memory optim for UNO (#521)

reduce gateway name
reduce parameters size
correct issue when using advanced config network
comment simple receiving per default (it is set in platformio.ini when necessary)

platformio.ini

@@ -500,7 +500,7 @@ lib_deps =
 build_flags = 
   ${com-arduino-low-memory.build_flags}
   '-DZgatewayRF="RF"'
-  '-DGateway_Name="OpenMQTTGateway_UNO_RF"'
+  '-DGateway_Name="OMG_1_RF"'
 
 [env:uno-fastled]
 platform = ${com.atmelavr_platform}
@@ -510,5 +510,5 @@ lib_deps =
   ${libraries.fastled}
 build_flags = 
   ${com-arduino-low-memory.build_flags}
-  '-DGateway_Name="OpenMQTTGateway_UNO_RF"'
+  '-DGateway_Name="OMG_1_FL"'
   '-DZactuatorFASTLED="FASTLED"'