Not sure what you are testing here, but it appears to be missing info. Your ncat command didn't include the --ssl option. So it's just a regular connection. Also you didn't change the channel config, so its a blocking socket and buffering is line mode. So, it won't do anything until you input a EOL.

If your goal is to test sending chat data, look at the demos/echat.tcl application. Start one with the -server option then one or more with the -client option. The server will then echo whatever text it receives from a client to all clients.