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