serialize method
Implementation
@override
ByteData serialize() {
var data_ = ByteData(mavlinkEncodedLength);
data_.setUint64(0, timeUsec, Endian.little);
data_.setUint32(8, seq, Endian.little);
data_.setUint8(12, targetSystem);
data_.setUint8(13, targetComponent);
return data_;
}