New answers tagged sockets
Can it be on your local network? If so, you can check out the various example programs at Rosetta and run whatever language you are most comfortable with. Tweak it to the port of your choice, and perhaps instead of echoing, have it output the data to a file or local terminal if you want a better way to access the data.
Socket.IO uses WebSocket protocol so you need to look for a load testing tool capable of WebSocket testing. As far as I'm aware there is a WebSocket Plugin for Apache JMeter which can be used to stress your chat application. See WebSocket Testing With Apache JMeter guide for more details.
Top 50 recent answers are included