Shelly Gen2 MQTT Help

[E1cid]

The shelly gen2 uses rpc channel to switch the device, so the topic is totally different.

There is an example here which should be similar

Shellyplus1 (gen2) Nodered to MQTT

I do not have any gen2 devices. But what have you tried? As far as i can make out you send {"id":123, "src":"user_1", "method":"Switch.Set", "params":{"id":0,"on":true}} to topic shelly_id/rpc id : number/string, identifier of this request, will be used to match the response frame. Required src : string, name of the source of the request (you can choose whatever string you like to identify you as the source of the request). Required method : string, name of the procedure to be called.…

and the shelly docs here

Switch | Shelly Technical Documentation