@dssuarez Hi, sorry for the late reply, national holidays here in China.

you can try to update the library as we added a new version using upip after u connect the device to the wifi or you could perhaps try the pre-made firmware for the MQTT that we've included in our repository.

The link for the firmware is HERE.

inside the umqttsimple you can configure your broker,port and IP address and inside the Eduponics app you can do the same (please note the mobile app doesn't support username/password on the broker yet)