Meross LAN - TLS not working with Mosquitto 6

Has anyone managed to get their MSS210 or MSS310 (apple homekit ready) WIFI plugs into HA via MQTT Mosquitto v6.xx using the Meross LAN integration?

I can see that:

Looking for some light at the end of the tunnel that someone has devices working over MQTT! (I can get them working over HTTP!)