Simple Socket IO is a project designed to help programmers to test TCP connections in your projects. It allows you to analyze messages from a server or client and responds them. Simple Socket IO has support simultaneous multi-connections both server-side and client.
The project is recent and receive updates soon, as support for UDP connections as well as improvements in data visualization.
Feel the will to assist in the project, all help will be appreciated.
On my page I have an article using Simple Socket IO to test the connectivity of ESP866, visit here!
Below is a gif demonstrative tool.
You can download Simple Socket IO here.