@type t() :: %APM.Message.OpticalFlowRad{
  distance: Float32,
  integrated_x: Float32,
  integrated_xgyro: Float32,
  integrated_y: Float32,
  integrated_ygyro: Float32,
  integrated_zgyro: Float32,
  integration_time_us: MAVLink.Types.uint32_t(),
  quality: MAVLink.Types.uint8_t(),
  sensor_id: MAVLink.Types.uint8_t(),
  temperature: MAVLink.Types.int16_t(),
  time_delta_distance_us: MAVLink.Types.uint32_t(),
  time_usec: MAVLink.Types.uint64_t()
}