Problem with mavlink communication

I am trying to make a mavlink library for dart. [254, 8, 0, 255, 1, 66, 0, 0, 0, 1, 1, 1, 10, 1, 106, 46] it’s a message that I made. That message should send a REQUEST_DATA_STREAM message with 1,1,1,10,1 params. But when I add value to TCP socket nothing happens.

Is that about my mavlink 1 packet or something else
I’m using dronekit-sitl for test

You made that message. Did you correctly add it to the autopilot source code?

By made I just mean I made the crc and crc extra. This Message is defined in common dialect

Did you see if that particular message is supported by the Ardupilot source code?

I didn’t look at dronekit-sitl source code but arducopter has this Message according to this doc Requesting Data From The Autopilot — Dev documentation

What message are you requesting? And I am not talking about the REQUEST_DATA_STREAM.

You keep on asking vague questions. I will keep on answering vague answers!