/relay/0 can not be contolled as the the switch position from the Shelly web interface takes priority.
You can change the state of the relay with mqtt , but within 20 seconds it will change to the state set but the embedded web interface.
/relay/1 can be stablely set , and is not effected by the embedded software setting of the switch.
Can the firmware be used to OR the outputs /relay/0 OR /relay/1 so the embedded control of /relay/0 can be set to off,
so that when the two outputs to the relay driver are OR'd that relay/1 can be used to control the relay.
Or would someone possibly like to fit two diodes between the relay driver and the output stages of /relay/0 and /relay/1
YOU CAN NOT USE THE CONTACTOR DRIVER WITH MQTT
My EM is load with the latest firmware,,
OR this this just going to be ignored and I'll have to use something like a Shelly1 to drive a contactor.
As it stands the EM does not do what it says it will do in the specifications