@type t() :: %APM.Message.HilState{
  alt: MAVLink.Types.int32_t(),
  lat: MAVLink.Types.int32_t(),
  lon: MAVLink.Types.int32_t(),
  pitch: Float32,
  pitchspeed: Float32,
  roll: Float32,
  rollspeed: Float32,
  time_usec: MAVLink.Types.uint64_t(),
  vx: MAVLink.Types.int16_t(),
  vy: MAVLink.Types.int16_t(),
  vz: MAVLink.Types.int16_t(),
  xacc: MAVLink.Types.int16_t(),
  yacc: MAVLink.Types.int16_t(),
  yaw: Float32,
  yawspeed: Float32,
  zacc: MAVLink.Types.int16_t()
}