Add SSL support

[vampywiz17]

Hello ,

Possible to add SSL option to MQTT config? (TLS not necessary)

[Legobas]

Did you try url: "ssl://<MQTT SERVER>:1883" instead of url: "tcp://<MQTT SERVER>:1883"?
I do not use SSL/TLS myself so I cannot test it.

[vampywiz17]

@Legobas

seems work, but possible skip cert?:

FATAL MQTT connection error="network Error : tls: failed to verify certificate: x509: certificate is not valid for any names, but wanted to match xxxxxxxx.com"

I hope it help, but i don't know possible to set it up in conf. file:

https://github.com/eclipse/paho.mqtt.golang/blob/master/cmd/ssl/main.go#L90