Switching individual outlets not working

[guyluz11]

I have a switche with multiple buttons and I want to turn them on/off individually.

Called the function setDevicePowerState(...) and specified a channel but no matter the channel I specify it always change just the first outlet.

I have tried channels 0 - 4 and getting the same result

setDevicePowerState(
            deviceId: 'MyDeviceId',
            state: 'on',
            channel: 2,
          );