// Messages from the broker come back to us as publish messages
private int handlePUBLISH(Socket mySocket, byte firstByte)
{
int remainingLength = 0;
int messageID = 0;
int topicLength = 0;
int topicIndex = 0;
int payloadIndex = 0;
int index = 0;
byte[] buffer = null;
byte[] topic = null;
byte[] payload = null;
int QoS = 0x00;
String topicString = null;
String payloadString = null;
remainingLength = undoRemainingLength(mySocket);
buffer = new byte[remainingLength];
if ((mySocket.Receive(buffer, 0) != remainingLength) || remainingLength < 5)
return Constants.ERROR;
topicLength += buffer[index++] * 256;
topicLength += buffer[index++];
topic = new byte[topicLength];
while (topicIndex < topicLength)
{
topic[topicIndex++] = buffer[index++];
}
QoS = firstByte & 0x06;
if (QoS > 0)
{
messageID += buffer[index++] * 256;
messageID += buffer[index++];
_logger.Debug("PUBLISH: Message ID: " + messageID);
}
topicString = new String(Encoding.UTF8.GetChars(topic));
_logger.Debug("PUBLISH: Topic: " + topicString);
payload = new byte[remainingLength - index];
while (index < remainingLength)
{
payload[payloadIndex++] = buffer[index++];
}
_logger.Debug("PUBLISH: Payload Length: " + payload.Length);
// This doesn't work if the payload isn't UTF8
payloadString = new String(Encoding.UTF8.GetChars(payload));
_logger.Debug("PUBLISH: Payload: " + payloadString);
MqttPublishMessage msg = new MqttPublishMessage(topicString, new MqttPayload(payloadString), false, (QoS)QoS);
OnPublishArrived(msg);
return Constants.SUCCESS;
}
protected void OnPublishArrived(MqttPublishMessage m)
{
bool accepted = false;
if (PublishArrived != null)
{
PublishArrivedArgs e = new PublishArrivedArgs(m.Topic, m.Payload, m.Retained, m.QualityOfService);
try
{
accepted |= PublishArrived(this, e);
}
catch (Exception ex)
{
_logger.Error("Uncaught exception from user delegate: " + ex.ToString());
}
}
}
