updated config example

check for MQTT / Ethernet setup

MQTTInterface.cpp

@@ -404,7 +404,7 @@ bool MQTTInterface::setupNetwork()
     IPAddress ip = Ethernet.localIP(); // reassign the obtained ip address
     DIAG(F("IP: %d.%d.%d.%d"), ip[0], ip[1], ip[2], ip[3]);
     DIAG(F("Port:%d"), IP_PORT);
-
+    
     return true;
 }
 

config.example.h

@@ -98,11 +98,14 @@ The configuration file for DCC-EX Command Station
 // library from <add link here> or get via the libray manager either from the IDE
 // or PIO
 
+// The following is only needed if the Broker requires it. cf broker descriptions below
 #define MQTT_USER   "your broker user name"
 #define MQTT_PWD    "your broker passwd"
 #define MQTT_PREFIX "prefix if required by the broker"
 
+// UNCOMMENT THE FOLLOWING LINE TO ENABLE MQTT 
 // #define ENABLE_MQTT true
+
 // Set the used broker to one of the configurations from MQTTBrokers.h where some
 // public freely avaiable brokers are configured
 

defines.h

@@ -40,7 +40,11 @@
 
 // MQTT handles ethernet on it's own
 #if ENABLE_MQTT && (defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_SAMD_ZERO) || defined(TEENSYDUINO)) 
+#if ENABLE_ETHERNET
+    #error Ethernet and MQTT can not be enabled simultaneaously
+#else
     #define MQTT_ON true
+#endif
 #endif 
 
 // #if WIFI_ON && ETHERNET_ON