Edit by 66er:
Unnecessary full quote from the last post removed. Please refrain.
SSL support seems broken for now. The debug console tells something about an SSL handshake error. Disabling SSL and specifying the host with port (host:1883) worked for me. However, even with MQTT working, this device isn't really useful for most applications without virtual controls and state indications. So far it's just as good as any dumb light-switch besides being able to report temperature, humidity and lux.