private async void RxThreadProc()
{
try
{
if (IsConnected)
{
#if !WindowsCE
m_stream.ReadTimeout = DefaultTimeout;
#endif
}
}
catch (ObjectDisposedException)
{
IsConnected = false;
}
m_rxCancelToken.Token.ThrowIfCancellationRequested();
// start a ping timer on a period less than the above timeout (else we'll timeout and exit)
m_pingTimer = new Timer(PingTimerProc, null, PingPeriod, PingPeriod);
List <byte> header = new List <byte>(4);
while ((ConnectionState == ConnectionState.Connecting) || (ConnectionState == ConnectionState.Connected))
{
if (m_rxCancelToken.Token.IsCancellationRequested)
{
m_rxCancelToken.Token.ThrowIfCancellationRequested();
}
header.Clear();
// the first byte gives us the type
try
{
var byte0 = m_stream.ReadByte();
if (byte0 == -1)
{
await Task.Delay(500);
continue;
}
//var messageType = (MessageType)(byte0 >> 4);
header.Add((byte)byte0);
byte lengthByte;
// now pull the "remaining length"
do
{
lengthByte = (byte)m_stream.ReadByte();
header.Add(lengthByte);
} while ((lengthByte & 0x80) != 0);
var length = FixedHeader.DecodeRemainingLength(header, 1);
byte[] buffer = null;
int read = 0;
if (length > 0)
{
// and pull the payload
buffer = new byte[length];
do
{
read += m_stream.Read(buffer, read, length - read);
} while (read < length);
}
// deserialize and dispatch
DeserializeAndDispatchMessage(header.ToArray(), buffer);
}
catch (Exception ex)
{
// happens during hang up, maybe on error
// needs testing
if (TracingEnabled)
{
Output.WriteLine("!!! Exception in MQTTBroker.RxProc\r\n" + ex.Message);
}
//if (Debugger.IsAttached) Debugger.Break();
IsConnected = false;
}
}
m_pingTimer.Dispose();
}
