/// <summary>
/// This is generic function which will send UDP command to specific IP, port and return the
/// reply if required
/// </summary>
/// <param name="socket">Socket - must be initialized</param>
/// <param name="bytes2Send">Bytes to send to the given socket</param>
/// <param name="replyRequired">Is reply required?</param>
/// <returns>Reply packet</returns>
public async Task <ReplyPacket> SendUdpAsync(UdpClient socket, byte[] bytes2Send, bool replyRequired = true)
{
ReplyPacket replyPacket = new ReplyPacket();
if (socket is null)
{
replyPacket.Error = "Socket is null";
return(replyPacket);
}
if (bytes2Send is null)
{
replyPacket.Error = "Bytes to send is null";
return(replyPacket);
}
try
{
int bytesSent = await socket.SendAsync(bytes2Send, bytes2Send.Length).ConfigureAwait(false);
replyPacket.IsSent = true;
if (replyRequired)
{
Task <UdpReceiveResult> taskRecievePacket = socket.ReceiveAsync();
taskRecievePacket.Wait(socket.Client.ReceiveTimeout);
if (taskRecievePacket.IsCompleted)
{
replyPacket.SetReply(taskRecievePacket.Result.Buffer);
replyPacket.IsSentAndReplyReceived = true;
}
}
}
catch (Exception ex)
{
replyPacket.Error = ex.Message;
}
return(replyPacket);
}
/// <summary>
/// It will connect on the server with given IP and Port then listens on it. Use it in the thread/task
/// </summary>
/// <param name="ip">Server IP</param>
/// <param name="port">Server Port</param>
/// <param name="endBytesIdentifier">
/// This identifies the end packet once receive these bytes it will push the packet. If null
/// then it pushes as it receives
/// </param>
/// <param name="connectionTimeoutMs"></param>
/// <param name="receiveTimeOut"></param>
/// <param name="transmissionTimeout"></param>
/// <returns>Connection Status</returns>
public bool Connect(string ip, int port, byte[] endBytesIdentifier = null, int connectionTimeoutMs = 2000, int receiveTimeOut = 1000, int transmissionTimeout = 1000)
{
if (endBytesIdentifier != null)
{
endBytesIdentifier = endBytesIdentifier.Reverse().ToArray();
}
if (IsConnected)
{
return(IsConnected);
}
clientTcp = new TcpClient()
{
ReceiveTimeout = receiveTimeOut, SendTimeout = transmissionTimeout
};
try
{
IAsyncResult result = clientTcp.BeginConnect(ip, port, null, null);
bool success = result.AsyncWaitHandle.WaitOne(connectionTimeoutMs, true);
IsConnected = clientTcp.Connected;
if (!IsConnected)
{
return(IsConnected);
}
Port = port;
Ip = ip;
}
catch (Exception ex)
{
ExceptionHandler?.Invoke(this, ex);
return(IsConnected);
}
try
{
stream = clientTcp.GetStream();
ReplyPacket replyPacket = new ReplyPacket()
{
IsSentAndReplyReceived = true, IPSender = ip
};
IsConnected = true;
List <byte> completePacket = new List <byte>();
Task.Run(async() =>
{
while (clientTcp.Connected)
{
if (!IsConnected)
{
break;
}
if (!stream.DataAvailable)
{
await Task.Delay(1).ConfigureAwait(false);
}
else
{
try
{
byte[] packet = new byte[clientTcp.Available];
await stream.ReadAsync(packet, 0, packet.Length).ConfigureAwait(false);
completePacket.AddRange(packet);
int lenth = completePacket.Count;
if (endBytesIdentifier != null)
{
//this will flush any data that was there before connecting to the software
//if (lenth > 5000) { completePacket.Clear(); continue; }
if (completePacket.Count > endBytesIdentifier.Length)
{
bool isPacketEndIdentified = false;
for (int i = 0; i < endBytesIdentifier.Length; i++)
{
if (completePacket[lenth - (i + 1)] == endBytesIdentifier[i])
{
isPacketEndIdentified = true;
}
else
{
isPacketEndIdentified = false;
break;
}
}
if (isPacketEndIdentified)
{
replyPacket.SetReply(completePacket);
DataReady?.Invoke(this, replyPacket);
completePacket.Clear();
}
}
}
else
{
replyPacket.SetReply(completePacket);
DataReady?.Invoke(this, replyPacket);
completePacket.Clear();
}
}
catch (Exception ex)
{
ExceptionHandler?.Invoke(this, ex);
}
}
}
});
}
catch (Exception ex)
{
ExceptionHandler?.Invoke(this, ex);
}
return(IsConnected);
}
/// <summary>
/// Returns the current status of listener
/// </summary>
/// <returns></returns>
public bool StartListener()
{
if (IsListening)
{
return(IsListening);
}
IPAddress serverIP = IPAddress.Parse(Services.CommonUtility.GetIPAddress());
listener = new TcpListener(serverIP, Port);
try
{
listener.Start();
IsListening = true;
}
catch (Exception ex)
{
IsListening = false;
ExceptionHandler?.Invoke(null, ex);
return(IsListening);
}
Task.Run(async() =>
{
while (IsListening)
{
try
{
ReplyPacket replyPacket = new ReplyPacket()
{
IsSentAndReplyReceived = true
};
TcpClient clientTCP = await listener.AcceptTcpClientAsync().ConfigureAwait(false);
replyPacket.PortSender = ((IPEndPoint)clientTCP.Client.RemoteEndPoint).Port;
replyPacket.IPSender = ((IPEndPoint)clientTCP.Client.RemoteEndPoint).Address.ToString();
if (ReceiveFromThisIPAddressList.Count > 0)
{
bool isProcessingRequired = false;
foreach (var ipAcceptable in ReceiveFromThisIPAddressList)
{
if (ipAcceptable == replyPacket.IPSender)
{
isProcessingRequired = true;
break;
}
}
if (!isProcessingRequired)
{
continue;
}
}
int length;
NetworkStream stream = clientTCP.GetStream();
List <byte> singlePacket = new List <byte>();
var byteArray = new byte[1024];
while ((length = stream.Read(byteArray, 0, byteArray.Length)) != 0)
{
var copy = new byte[length];
Array.Copy(byteArray, 0, copy, 0, length);
singlePacket.AddRange(copy);
}
replyPacket.SetReply(singlePacket);
DataEvent?.Invoke(this, replyPacket);
if (IsAutoReplying)
{
await stream.WriteAsync(AutoReply?.ToArray(), 0, AutoReply.Count).ConfigureAwait(false);
stream.Flush();
}
stream.Close();
clientTCP.Close();
}
catch (Exception ex)
{
ExceptionHandler?.Invoke(this, ex);
}
}
listener.Server.Close();
});
return(IsListening);
}
/// <summary>
/// This is generic function which will send TCP command to specific IP, port and return the
/// reply if required
/// </summary>
/// <param name="inputCommand">Commnad to be sent</param>
/// <param name="isReplyRequired">Wait for reply?</param>
/// <param name="txTimeout">Transmission timeout (ms)</param>
/// <param name="rxTimeout">Receive timeout (ms)</param>
/// <param name="connectionTimeout">Connection timeout (ms)</param>
/// <param name="fireOnSent">Fires event on packet sent</param>
/// <returns>Reply packet</returns>
public async Task <ReplyPacket> SendTcpAsync(byte[] inputCommand, bool isReplyRequired = true, int txTimeout = defaultTimeout,
int rxTimeout = defaultTimeout, int connectionTimeout = defaultConnectionTimeout, Action <bool> fireOnSent = null)
{
ReplyPacket replyPacket = new ReplyPacket();
if (inputCommand is null)
{
replyPacket.Error = "Bytes to send is null";
return(replyPacket);
}
using (TcpClient client = new TcpClient
{
ReceiveTimeout = rxTimeout,
SendTimeout = txTimeout
})
{
try
{
IAsyncResult connectResult = client.BeginConnect(IP, Port, null, null);
replyPacket.IPSender = IP;
replyPacket.PortSender = Port;
Task <bool> connectionTask = new Task <bool>(() =>
connectResult.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(connectionTimeout)));
connectionTask.Start();
if (await connectionTask.ConfigureAwait(false))
{
using (NetworkStream stream = client.GetStream())
{
await stream.WriteAsync(inputCommand, 0, inputCommand.Length).ConfigureAwait(false);
stream.Flush();
replyPacket.IsSent = true;
fireOnSent?.Invoke(replyPacket.IsSent);
if (isReplyRequired)
{
//Reading The first byte for the sake of timeout
byte[] reply = new byte[1];
await stream.ReadAsync(reply, 0, 1).ConfigureAwait(false);
byte[] replyComplete = null;
//Reading rest of the bytes
if (stream.DataAvailable)
{
replyComplete = new byte[client.Available + 1];
replyComplete[0] = reply[0];
await stream.ReadAsync(replyComplete, 1, replyComplete.Length - 1).ConfigureAwait(false);
}
if (replyComplete != null)
{
replyPacket.SetReply(replyComplete);
replyPacket.IsSentAndReplyReceived = true;
}
else
{
replyPacket.Error = "Unable to read from remote address";
}
}
}
}
else
{
fireOnSent?.Invoke(replyPacket.IsSent);
replyPacket.Error = "Connection TimeOut/Server Not Found";
}
}
catch (Exception ex)
{
replyPacket.Error = ex.Message;
}
}
return(replyPacket);
}
