Sysid - messages frame

Hello, I tried to send a group of messages to a specific UDP without launching any simulation, every 0,2 seconds.
I succeeded and MAVProxy identified these messages as a vehicle ‘COPTER’. But the problem is that I don’t know how to change the sysid that is automatically set to 255. The 2nd problem (that is probably linked to the other one) is that I got 2 instances of the sysid 255 in MAVProxy. The first one is identified as ‘COPTER’, as said before, but the second one is identified as ‘?’ and I don’t know how to remove it.

Then, I thought that maybe I should send the frame of the messages but even though there is this page, I don’t understand how this works.

Does anyone knows how to do it ?

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