getWriteLength method
Gets the length of the write data when WriteTo will be called.
Implementation
@override
int getWriteLength() {
var headerLength = 0;
final enc = MqttEncoding();
headerLength += enc.getByteCount(topicName);
if (header!.qos == MqttQos.atLeastOnce ||
header!.qos == MqttQos.exactlyOnce) {
headerLength += 2;
}
return headerLength;
}