/// <summary>
///
/// </summary>
/// <param name="ar"></param>
private void NetworkReadBuffer(IAsyncResult ar)
{
int bytesRead = Stream.EndRead(ar);
try
{
// read PDU data from stream
ProtocolDataUnit pdu = ProtocolDataUnit.ReadFrom(tempBuffer);
#if TRACE
if (pdu != null)
{
Messages.Trace("[SNIP .. Packet Rx from " + PhysicalAddress.ToString() + "]");
Messages.TraceHex("hdr", pdu.HeaderData, pdu.HeaderData.Length);
Messages.Trace("hdr->checksum = " + pdu.Header.CRC.ToString("X"));
Messages.Trace("hdr->length = " + pdu.Header.Length.ToString());
Messages.Trace("hdr->macAddr = " +
pdu.Header.MacAddr[0].ToString("X") + ":" +
pdu.Header.MacAddr[1].ToString("X") + ":" +
pdu.Header.MacAddr[2].ToString("X") + ":" +
pdu.Header.MacAddr[3].ToString("X") + ":" +
pdu.Header.MacAddr[4].ToString("X") + ":" +
pdu.Header.MacAddr[5].ToString("X"));
Messages.Trace("hdr->dataLength = " + pdu.Header.DataLength);
Messages.Trace("hdr->compressLength = " + pdu.Header.CompressedLength);
Messages.Trace("hdr length " + pdu.Header.Length);
if (pdu.ContentData != null)
{
Messages.TraceHex("frame", pdu.ContentData, pdu.ContentData.Length);
Messages.Trace("frame length " + pdu.ContentData.Length);
Messages.Trace("MAC Destination = " +
pdu.ContentData[0].ToString("X") + ":" +
pdu.ContentData[1].ToString("X") + ":" +
pdu.ContentData[2].ToString("X") + ":" +
pdu.ContentData[3].ToString("X") + ":" +
pdu.ContentData[4].ToString("X") + ":" +
pdu.ContentData[5].ToString("X"));
Messages.Trace("MAC Source = " +
pdu.ContentData[6].ToString("X") + ":" +
pdu.ContentData[7].ToString("X") + ":" +
pdu.ContentData[8].ToString("X") + ":" +
pdu.ContentData[9].ToString("X") + ":" +
pdu.ContentData[10].ToString("X") + ":" +
pdu.ContentData[11].ToString("X"));
}
Messages.Trace("[SNIP .. Packet Rx from " + PhysicalAddress.ToString() + "]");
}
#endif
// reset exception counter
if (streamExceptionCount > 0)
{
streamExceptionCount = 0;
}
// did we receive a pdu?
if (pdu != null)
{
// are we trying to shut down the session?
if ((pdu.Header.CRC == 250) && (pdu.Header.DataLength == 65535))
{
Close();
return;
}
// are we trying to register a client?
if ((pdu.Header.CRC == 255) && (pdu.Header.DataLength == 0))
{
HandshakeHeader header = new HandshakeHeader();
header.CRC = 255;
header.DataLength = 0;
header.CompressedLength = 0;
header.Length = (ushort)header.Size;
byte[] node = new byte[6];
// generate a new MAC address
// set first 3 octets
node[0] = 0xAC;
node[1] = 0xDE;
node[2] = 0x48;
// maybe this is a reconnect? we have the last 3 of an assigned MAC
if ((pdu.Header.MacAddr[3] != 0) && (pdu.Header.MacAddr[4] != 0) && (pdu.Header.MacAddr[5] != 0))
{
Messages.WriteWarning("session reconnect? we recieved the last 3 " +
pdu.Header.MacAddr[3].ToString("X") + ":" +
pdu.Header.MacAddr[4].ToString("X") + ":" +
pdu.Header.MacAddr[5].ToString("X"));
node[3] = pdu.Header.MacAddr[3];
node[4] = pdu.Header.MacAddr[4];
node[5] = pdu.Header.MacAddr[5];
}
else
{
Random rand = new Random();
node[3] = (byte)rand.Next(255);
node[4] = (byte)rand.Next(255);
node[5] = (byte)rand.Next(255);
}
header.MacAddr = node;
this.macAddress = node;
Messages.Trace("new session macAddr = " +
macAddress[0].ToString("X") + ":" +
macAddress[1].ToString("X") + ":" +
macAddress[2].ToString("X") + ":" +
macAddress[3].ToString("X") + ":" +
macAddress[4].ToString("X") + ":" +
macAddress[5].ToString("X"));
// build final payload
byte[] buffer = new byte[Util.RoundUp(header.Size, 4)];
header.WriteTo(buffer, 0);
// transmit
if (Stream.CanWrite)
{
Stream.Flush();
Stream.Write(buffer, 0, buffer.Length);
Stream.Flush();
}
return;
}
commMgr.BroadcastPacket(pdu);
}
}
catch (IOException)
{
waitMRE.Wait(1); // wait a bit before reading again
waitMRE.Set();
// increment exception counter
streamExceptionCount++;
if (streamExceptionCount >= MAX_STREAM_EXECPTIONS)
{
this.Close();
}
}
finally
{
waitMRE.Set();
}
}
