@soloam look at this https://forum.mysensors.org/topic/8863/esp8266-mqtt-gateway-ssl-connection/1

Did you have any success to implement SSL support to the mqtt broker?

@hek said: @noelgeorgi said: http://forum.arduino.cc/index.php?topic=101104.0 This solution adds zero security. Password is transported unencrypted over the network. It provide negative security. Such a piss poor solution actually makes existing security weaker. And potentially compromises the entire system. :-1: