setDevicePowerState
Change specified device power state.
Usage
  const status = await connection.setDevicePowerState('<your device id>', 'on');
  console.log(status);  // multi-channel devices like Sonoff 4CH
  const status = await connection.setDevicePowerState('<your device id>', 'toggle', <channel>);
  console.log(status);Possible states: on, off, toggle.
* Remember to instantiate class before use
Response example
  {
    status: 'ok',
    state: 'on'
  }Last update on: September 15th, 2019
        