I have created a WebSocket server in python using the Wamp WS. I am connecting a DotNet application containing the WampSharp client with the above mentioned WebSocket server using the following code:
DefaultWampChannelFactory channelFactory = new DefaultWampChannelFactory();
channel = channelFactory.CreateChannel(serverAddress);
channel.Open();
Now I need to ping my server from the client. When I had a look at the Wamp WS client created in Python it consisted of the sendPing(self,payload) function which would ping the server as follows:
WampClientProtocol.sendPing(self, payload)
and at server side there is a onPing function which handles the ping sent as follows:
def onPing(self, payload):
print "Recieved ping message successfully"
Thus, I would like to know whether there is any way I could ping the server from my WampSharp client?
WebSocket Server started at: 127.0.0.1:8000
Thanks in advance
There is no supported way to do this currently.
Note that WampSharp wraps WebSocket4Net's WebSocket class, which by default automatically sends a ping message every 60 seconds.
I could not find any support for manual ping send in WebSocket4Net from the WebSocket class, but maybe it exists and I missed it.
If you want, you can find a different WebSocket client library that supports manual ping send, and implement a IControlledWampConnection that wraps it (see WebSocket4NetConnection), and use the DefaultWampChannelFactory overload that specifies the IControlledWampConnection to use (see WebSocket4Net extension methods).
Related
When I use WebSocket server in C#, and access it in local PC, it works normally. But when I try to access with another PC, it doesn't work.
I'm using WebSocket library from Fleck.
Code in C# WebSocket Server:
_server = new Fleck.WebSocketServer("wss://127.0.0.1:8181");
_server.Certificate = new X509Certificate2(#"C:\test.com.pfx", "123");
Code in HTML/Javascript:
websocket = new WebSocket('wss://192.168.1.37:8181');
When I work with insecure WebSocket "ws://127.0.0.1:8181" when I try to access the local IP "ws://192.168.1.37:8181", it the Chrome Console sends the error:
The page at 'https://www.websocket.org/echo.html' was loaded over HTTPS, but attempted to connect to the insecure WebSocket endpoint 'ws://192.168.1.37:8181/?encoding=text'. This request has been blocked; this endpoint must be available over WSS.
When I work with Secure WebSocket "wss://127.0.0.1:8181"
it sends the error:
WebSocket connection to 'wss://192.168.1.37:8181/?encoding=text' failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED
It only works when I type "wss://127.0.0.1:8181" in WebSocket client, but I want to work with the standard IP, to be accessed by other PC.
I found the solution, here the steps if someone needs:
You need to start the Fleck WebSocket server as bellow:
_server = new Fleck.WebSocketServer("wss://0.0.0.0:8181");
_server.Certificate = new X509Certificate2(#"C:\test.com.pfx", "123");
Then in the PC that you want to access though WebSocket client, you need to access first with the browser:
https://192.168.1.37:8181
Then you allow the access. (It'll let the Certification of an Unknown User)
After that you WebSocket Client will work.
Existing scenario is explained below.
Our application is running on Client Server architecture; Client is developed with VC++ and Server is developed with C#.
On the Server side there are two exe's running (myServer1.exe -Windows service based, and myServer2.exe -Windows application). myServer2.exe is communicating to myServer1.exe through TCP socket connection.On the Client side, an exe (myApp1.exe -Windows Service based) runs another exe based on user sessions present in the machine (myUser.exe for all user sessions). Every myUser.exe instances are communicating to myApp1.exe through PIPE communication. And myApp1.exe is also communicating to myServer1.exe through another TCP communication.
New scenario.
We are now creating a TCP socket in listening mode in myServer2.exe (Server application -C#). myUser.exe (Client application -VC++) is trying to connect to myServer2.exe through a TCP connection by using CAsyncSocket. But the framework calls (OnConnect, OnReceive and OnClose) are not happening.
Socket creation- Create(0,SOCK_STREAM); // CAyncSocket
Socket connection- Connect("ServerIP", "ServerPort"); // CAsyncSocket
Note: when we move the socket creation and connection functionalities into Windows service based exe (myApp1.exe), the connection works fine, OnConnect OnReceive and OnClose are happening.
Why framework call to OnConnect is not happening in myUser.exe while in myApp1.exe is?
Your OnConnect method is not called because probably you don't have the message loop in myUser.exe while you have it in myApp.exe.
Error code 10035 is WSAEWOULDBLOCK and it' normal for your case, from MSDN:
It is normal for WSAEWOULDBLOCK to be reported as the result from
calling connect on a nonblocking SOCK_STREAM socket, since some time
must elapse for the connection to be established.
So don't worry about it. If you have a message loop, after your Connect call, the OnConnect method will finally be called at a certain time with a successful result or with an error code.
See also codeproject and SO
I am able to have c# (client) and python (server) talk to each other by using a simple request-reply. However, I want my web application built on c# asp.net to be stable and need more clients and servers, so I tried connecting c# and python using the Router-Dealer Proxy with python.
I tried running the proxy python script first, then running c# (client), then python (server). However, when I run the python (server), it gives me an "Address in use" error message.
Am I running them in a wrong order OR is there something wrong with the proxy python script (shown below)?
5602 = c# client
5603 = python server
def main():
context = zmq.Context()
# Socket facing clients
frontend = context.socket(zmq.ROUTER)
frontend.bind("tcp://*:5602")
# Socket facing services
backend = context.socket(zmq.DEALER)
backend.bind("tcp://*:5603")
zmq.proxy(frontend, backend)
# We never get here…
frontend.close()
backend.close()
context.term()
if __name__ == "__main__":
main()
I'm assuming your servers use bind, so the proxy should connect to them rather than also using bind.
Note: in zeromq the order of application startup doesn't matter so you can tell your proxy to connect to a server that doesn't yet exist, when the server is started the connection will be made.
I have a Websocket Stomp server built in Java (Spring based). My JavaScript client is able to talk to the server using Stomp over Web Socket - no issues.
I'm trying to use the WebSocket4Net library to build the C# client. Can anyone please tell me how can I build the Stomp message frames in bytes[] and send them to the server?
In the OnOpen() method, I'm doing the following:
String stompMsg = "CONNECT\n";
stompMsg += "accept-version:1.1,1.2\n\n";
stompMsg += "^#";
Byte[] bytesToSend = Encoding.UTF8.GetBytes(stompMsg);
websocketObj.Send(bytesToSend, 0, bytesToSend.Length);
I get the following message from server:
Failed to parse BinaryMessage payload - java.nio.HeapByteBuffer.
Sending STOMP ERROR to client.
java.lang.IllegalArgumentException: Object of class [org.springframework.web.socket.BinaryMessage] must be an instance of class org.springframework.web.socket.TextMessage
at org.springframework.util.Assert.isInstanceOf(Assert.java:339)
at org.springframework.util.Assert.isInstanceOf(Assert.java:319)
at org.springframework.web.socket.messaging.StompSubProtocolHandler.handleMessageFromClient(StompSubProtocolHandler.java:189)
at org.springframework.web.socket.messaging.SubProtocolWebSocketHandler.handleMessage(SubProtocolWebSocketHandler.java:307)
at org.springframework.web.socket.handler.WebSocketHandlerDecorator.handleMessage(WebSocketHandlerDecorator.java:75)
at org.springframework.web.socket.handler.LoggingWebSocketHandlerDecorator.handleMessage(LoggingWebSocketHandlerDecorator.java:55)
at org.springframework.web.socket.handler.ExceptionWebSocketHandlerDecorator.handleMessage(ExceptionWebSocketHandlerDecorator.java:71)
at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.handleBinaryMessage(StandardWebSocketHandlerAdapter.java:122)
at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.access$100(StandardWebSocketHandlerAdapter.java:42)
at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter$4.onMessage(StandardWebSocketHandlerAdapter.java:88)
at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter$4.onMessage(StandardWebSocketHandlerAdapter.java:85)
at org.apache.tomcat.websocket.WsFrameBase.sendMessageBinary(WsFrameBase.java:549)
at org.apache.tomcat.websocket.WsFrameBase.processDataBinary(WsFrameBase.java:514)
at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:274)
at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:116)
at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:54)
at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:192)
at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:178)
at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:92)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:601)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2430)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2419)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Can anyone please suggest if you have successfully created / used any C# client library with a spring based STOMP over Web Socket server?
#Artem - Thank you SO much. The \0 indeed did the trick.
websocket.Send("SUBSCRIBE\nid:sub-0\ndestination:/topic/mytopic\n\n\0");
My system is accessing internet via a proxy server
(IE proxy server address : myserver.mydomain.com , port: 80).
Im trying to send some data to a TCP server using class "System.Net.Sockets.TcpClient". But i am unable to connect. If I try using static IP internet, i am able to connect.
Is there any way to provide proxy address ? I am pretty sure the problem is the proxy, because i have tried from two systems which do not use proxy and it worked fine.
My application is a console application.
My Code is something like :
TcpClient tcpClient = new TcpClient("tcpserver.com", 3101);
string message = "message";
byte[] auditMessageStream;
auditMessageStream = Encoding.UTF8.GetBytes(message);
int i = tcpClient.Client.Send(auditMessageStream);
You can use this opensource lib to create a socket conection through a proxy.
Watch this too
You need HTTP tunneling unless your proxy is a SOCKS proxy.