docs: def remote_command(session, command, vehicle_index, poll=True):
      """Send a remote command."""
      if command not in SUPPORTED_COMMANDS:
          raise MoparError("unsupported command: " + command)
      profile = get_profile(session)
      _validate_vehicle(vehicle_index, profile)
      if command in [COMMAND_LOCK, COMMAND_UNLOCK]:
          url = REMOTE_LOCK_COMMAND_URL
      elif command in [COMMAND_ENGINE_ON, COMMAND_ENGINE_OFF]:
          url = REMOTE_ENGINE_COMMAND_URL
      elif command == COMMAND_HORN:
          url = REMOTE_ALARM_COMMAND_URL
      resp = session.post(url, {
          'pin': session.auth.pin,
          'uuid': profile['vehicles'][vehicle_index]['uuid'],
          'action': command
      }).json()
      if poll:
          uuid = profile['vehicles'][vehicle_index]['uuid']
          service_id = resp['serviceRequestId']
          return _remote_status(session, service_id, uuid, url)
      return 'submitted'