ESP8266 MQTT client dynamically changing MQTT broker settings

[Japio]

Hi,

I am working on an ESP8266 MQTT gateway with a web interface to allow th user to configure settings. One of these settings is the MQTT broker IP address and port number.

In the before() I read out the IP address from EEPROM and want to set it in the gateway software, and not as normally done by defining MY_CONTROLLER_IP_ADDRESS.

Is it possible to do this?

I already tried to declare _ethernetControllerIP as external. This doesn't work.
Also tried to skip de definition MY_CONTROLLER_IP_ADDRESS and declar it in the gateway sketch. Didn't work either.