you are getting the timeout because the client cannot reach the server. the handshake never happens. if both server and client are on the same machine use ws://localhost:12348. if they are on different devices use the local network ip address of the server like ws://192.168.x.x:12348. make sure both are on the same wifi network. also check that the firewall on the server allows inbound connections on port 12348. you can do that with netsh advfirewall firewall add rule name="websocketserver" dir=in action=allow protocol=tcp localport=12348. also confirm the server is actually listening by running netstat -an | find "12348". if it shows listening then it is working. test first with a simple text message instead of an image to confirm the connection. then move to sending binary data.