Does not compile on ESP8266 due to ArduinoMqttClient library

[ferdinand0815]

Does not compile on the ESP8266 due to ESP8266-specific code in the ArduinoMqttClient library.

There is a pull request fixing this issue arduino-libraries/ArduinoMqttClient#33 . This seems to be related to the ESP8266 core 2.5.0 release, which is long outdated.

To fix this issue locally remove the ESP8266-specific code as done in the pull request.

[ferdinand0815]

Fixed dirty, this is only an issue when connecting to a host using its IPAddress, not via host name.

This offers a quick solution, convert the IP to a string .. not ideal but whatever.