[MQTT] replace user/password name after enhanced ttn-receiver.py

python/ttn_mqtt-receiver.py

@@ -62,8 +62,8 @@ if __name__ == '__main__':
     mqttc.on_disconnect=on_disconnect
 
     log.debug("Connecting to ttn")
-    username="" #Put your username
-    password="" #Put your password	
+    username=os.environ['ttn_user']
+    password=os.environ['ttn_password']	
     
     mqttc.username_pw_set(username, password)
     mqttc.connect("eu.thethings.network",1883,10)