Energenie PMS2-LAN Socket

[gackelchen]

I have an Energenie PMS2-LAN socket I want to control with my Harmony.

Mosquitto is on my Synology NAS. I can address Harmony span in my local network with http://192.168.178.60:8060/config.
On Synology I also have a script to switch the sockets, e.g. "egctl eg1 on on on on" (to switch on all 4 sockets)

How can I address this with Harmony Span?
I thought with this MQTT message:
{"egctl eg1 on on on on"}
Or do I have to specify URL and port? I think at least the port. And username and password?

And I think my local IP for mosquitto should be that:
mqtt://192.168.178.60:1883
But I don't know a username and a password. Is it the one connecting to the NAS?