I am developing a WebSocket server with C# and I noticed that all the messages that coming from the browser (Chrome in that case) using the send() method are 126 chars lengt
That is not correct what you said DTB. Sending should definitely support more than 126 chars. It is a matter of properly formatting your output. If we were limited to 126 chars there would be no signalling servers for WebRTC. I will code this send message function and post it on here when I finish.