Method enable_joystick

OpenHD/ohd_telemetry/src/GroundTelemetry.cpp:414–441

#ifdef OPENHD_TELEMETRY_SDL_FOR_JOYSTICK_FOUND
void GroundTelemetry::enable_joystick() {
  if (m_rc_joystick_sender != nullptr) {
    m_console->warn("Joy already enabled");
    return;
  }
  auto cb = [this](std::array<uint16_t, 18> channels) {
    // Dirty - we want the message both in the GCS station for debugging BUT
    // need to perform some annoying workaround for ARDUPILOT in regard to the
    // SYS id. Which is why we send the same data as 2 different messages to the
    // air unit(FC) and to the GCS stations, and the message for the air unit
    // has the "wrong" source sys id so to say See
    // https://github.com/ArduPilot/ardupilot/blob/master/libraries/GCS_MAVLink/GCS_Common.cpp#L3507
    // and https://github.com/ArduPilot/ardupilot/issues/1515
    auto msg_for_air =
        rc_channels_override_from_array(QOPENHD_SYS_ID, 1, channels, 0, 0);
    send_messages_air_unit({msg_for_air});
    // to the GCS stations
    auto msg_for_gcs =
        rc_channels_override_from_array(OHD_SYS_ID_GROUND, 0, channels, 0, 0);
    send_messages_ground_station_clients({msg_for_gcs});
  };
  auto mapping_parsed = openhd::convert_string_to_channel_mapping_or_default(
      m_gnd_settings->get_settings().rc_channel_mapping);
  m_rc_joystick_sender = std::make_unique<RcJoystickSender>(
      cb, m_gnd_settings->get_settings().rc_over_joystick_update_rate_hz,
      mapping_parsed);
  m_console->info("Joystick enabled");
}
void GroundTelemetry::disable_joystick() {
  if (m_rc_joystick_sender == nullptr) {
    m_console->warn("Joy already disabled");