@mnizamudeen The easiest way to test the dashboard server is create a tcp device in ignition. Set it to packet based.
click advanced properties and check the writable option it's false by default. Put a newline character for the writeback message Delimiter.
The link I sent above has the list of commands. Just write your message to the writable tag for the tcp device.
Then when you hit enter the driver will write the message to the dashboard server. In this screenshot I am connected to ursim in a docker container.