code: func (m *DataStream) Pack() []byte {
  	data := new(bytes.Buffer)
  	binary.Write(data, binary.LittleEndian, m.MESSAGE_RATE)
  	binary.Write(data, binary.LittleEndian, m.STREAM_ID)
  	binary.Write(data, binary.LittleEndian, m.ON_OFF)
  	return data.Bytes()
  }
docs: // Pack returns a packed byte array which represents a DataStream payload