public void StartListening(string IP, int port, Boolean test)
{
// Establish the local endpoint for the socket.
// The DNS name of the computer
// running the listener is "host.contoso.com".
IPHostEntry ipHostInfo = Dns.GetHostEntry(IP); //Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
//IPAddress local = IPAddress.Parse(IP);
UInt16 sendCRC = 0;
DateTime date;
int year = 0;
int month = 0;
int day = 0;
int hour = 0;
int minute = 0;
int second = 0;
IPEndPoint localEndPoint = null;
if (test)
{
localEndPoint = new IPEndPoint(IPAddress.Any, port);
}
else
{
localEndPoint = new IPEndPoint(ipAddress, port);
}
// Create a TCP/IP socket.
Socket listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// Bind the socket to the local endpoint and listen for incoming connections.
try
{
allDone.Reset();
listener.Bind(localEndPoint);
listener.Listen(100);
//login code, wait for 1st message
Console.WriteLine("Wait 5 seconds for login message");
listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);
Boolean firstMessage = true;
//loop forever
while (true)
{
allDone.WaitOne();
//read fifo until empty
while (fifo.Count > 0)
{
//read one connection until buffer doesn't contain any more packets
KeyValuePair <List <byte>, StateObject> byteState = ReadWrite(-1, PROCESS_STATE.PROCESS, null, null, null);
StateObject state = byteState.Value;
while (true)
{
KeyValuePair <UNPACK_STATUS, byte[]> status = Unpack(byteState.Key);
if (status.Key == UNPACK_STATUS.NOT_ENOUGH_BYTES)
{
break;
}
//message is 2 start bytes + 1 byte (message length) + 1 byte message length + 2 end bytes
byte[] receiveMessage = status.Value;
if (status.Key != UNPACK_STATUS.GOOD_MESSAGE)
{
int zzz = -1;
}
int messageLength = receiveMessage[2];
Console.WriteLine("Status : '{0}', Receive Message : '{1}'", status.Key == UNPACK_STATUS.GOOD_MESSAGE ? "Good" : "Bad", BytesToString(receiveMessage.Take(messageLength + 5).ToArray()));
if (status.Key != UNPACK_STATUS.GOOD_MESSAGE)
{
Console.WriteLine("Error : Bad Login Message, Data : '{0}'", BytesToString(receiveMessage));
break;
}
else
{
if (firstMessage)
{
if (receiveMessage[3] != 0x01)
{
Console.WriteLine("Error : Expected Login Message : '{0}'", BytesToString(receiveMessage));
break;
}
firstMessage = false;
}
//skip start bytes, message length. then go back 4 bytes (CRC and serial number)
byte[] serialNumber = receiveMessage.Skip(2 + 1 + messageLength - 4).Take(2).ToArray();
PROTOCOL_NUMBER protocolNumber = (PROTOCOL_NUMBER)receiveMessage[3];
switch (protocolNumber)
{
case PROTOCOL_NUMBER.LOGIN_MESSAGE:
serialNumber.CopyTo(loginResponse, 4);
sendCRC = crc_bytes(loginResponse.Skip(2).Take(loginResponse.Length - 6).ToArray());
loginResponse[loginResponse.Length - 4] = (byte)((sendCRC >> 8) & 0xFF);
loginResponse[loginResponse.Length - 3] = (byte)((sendCRC) & 0xFF);
string terminalID = Encoding.ASCII.GetString(receiveMessage.Skip(4).Take(messageLength - 5).ToArray());
Console.WriteLine("Received good login message from Serial Number : '{0}', Terminal ID = '{1}'", "0x" + serialNumber[0].ToString("X2") + serialNumber[1].ToString("X2"), terminalID);
Console.WriteLine("Send Message : '{0}'", BytesToString(loginResponse));
Send(state.workSocket, loginResponse);
break;
case PROTOCOL_NUMBER.LOCATION_DATA:
year = receiveMessage[4];
month = receiveMessage[5];
day = receiveMessage[6];
hour = receiveMessage[7];
minute = receiveMessage[8];
second = receiveMessage[9];
date = new DateTime(2000 + year, month, day, hour, minute, second);
Console.WriteLine("Received good location message from Serial Number '{0}', Time = '{1}'", "0x" + serialNumber[0].ToString("X2") + serialNumber[1].ToString("X2"), date.ToLongDateString());
break;
case PROTOCOL_NUMBER.ALARM_DATA:
year = receiveMessage[4];
month = receiveMessage[5];
day = receiveMessage[6];
hour = receiveMessage[7];
minute = receiveMessage[8];
second = receiveMessage[9];
date = new DateTime(2000 + year, month, day, hour, minute, second);
Console.WriteLine("Received good alarm message from Serial Number '{0}', Time = '{1}'", "0x" + serialNumber[0].ToString("X2") + serialNumber[1].ToString("X2"), date.ToLongDateString());
int packetLen = alarmResponse.Length - 5;
alarmResponse[2] = (byte)(packetLen & 0xFF);
serialNumber.CopyTo(alarmResponse, packetLen - 1);
sendCRC = crc_bytes(alarmResponse.Skip(2).Take(packetLen - 1).ToArray());
alarmResponse[packetLen + 1] = (byte)((sendCRC >> 8) & 0xFF);
alarmResponse[packetLen + 2] = (byte)((sendCRC) & 0xFF);
Console.WriteLine("Send Message : '{0}'", BytesToString(alarmResponse));
Send(state.workSocket, alarmResponse);
break;
} //end switch
} // End if
} //end while
} //end while fifo > 0
allDone.Reset();
} //end while true
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
static KeyValuePair <List <byte>, StateObject> ReadWrite(long connectionNumber, PROCESS_STATE ps, Socket handler, IAsyncResult ar, List <byte> working_buffer)
{
KeyValuePair <List <byte>, StateObject> byteState = new KeyValuePair <List <byte>, StateObject>();;
StateObject state = null;
Object thisLock = new Object();
lock (thisLock)
{
switch (ps)
{
case PROCESS_STATE.ACCEPT:
state = new StateObject();
state.buffer = new byte[BUFFER_SIZE];
state.connectionNumber = connectionNumber;
connectionDict.Add(connectionNumber++, new KeyValuePair <List <byte>, StateObject>(new List <byte>(), state));
// Create the state object.
state.workSocket = handler;
byteState = new KeyValuePair <List <byte>, StateObject>(null, state);
break;
case PROCESS_STATE.READ:
//catch when client disconnects
try
{
// Read data from the client socket.
int bytesReads = handler.EndReceive(ar);
if (bytesReads > 0)
{
byteState = connectionDict[connectionNumber];
byteState.Key.AddRange(byteState.Value.buffer.Take(bytesReads).ToArray());
}
//only put one instance of connection number into fifo
if (!fifo.Contains(connectionNumber))
{
fifo.Add(connectionNumber);
}
}
catch (Exception ex)
{
fifo.RemoveAll(x => x == connectionNumber);
connectionDict.Remove(connectionNumber);
byteState = new KeyValuePair <List <byte>, StateObject>();
}
break;
case PROCESS_STATE.PROCESS:
if (fifo.Count > 0)
{
byteState = connectionDict[fifo.First()];
fifo.RemoveAt(0);
byteState.Key.AddRange(byteState.Key);
}
break;
case PROCESS_STATE.UNPACK:
int len = working_buffer[2];
if ((working_buffer[0] != 0x78) && (working_buffer[1] != 0x78) && (working_buffer[len + 3] != 0x0D) && (working_buffer[len + 4] != 0x0A))
{
working_buffer.Clear();
return(new KeyValuePair <List <byte>, StateObject>(null, null));
}
List <byte> packet = working_buffer.Take(len + 5).ToList();
working_buffer.RemoveRange(0, len + 5);
byteState = new KeyValuePair <List <byte>, StateObject>(packet, null);
break;
} // end switch
}
return(byteState);
}