code: func (m *HilOpticalFlow) Pack() []byte {
  	data := new(bytes.Buffer)
  	binary.Write(data, binary.LittleEndian, m.TIME_USEC)
  	binary.Write(data, binary.LittleEndian, m.FLOW_COMP_M_X)
  	binary.Write(data, binary.LittleEndian, m.FLOW_COMP_M_Y)
  	binary.Write(data, binary.LittleEndian, m.GROUND_DISTANCE)
  	binary.Write(data, binary.LittleEndian, m.FLOW_X)
  	binary.Write(data, binary.LittleEndian, m.FLOW_Y)
  	binary.Write(data, binary.LittleEndian, m.SENSOR_ID)
  	binary.Write(data, binary.LittleEndian, m.QUALITY)
  	return data.Bytes()
  }
docs: // Pack returns a packed byte array which represents a HilOpticalFlow payload