Welcome. Yes, I had this but on Linux with an outdated pyserial module long time back.
It would help if you could post your operating system and the versions of GroundControl and Firmware you are using.
Did you close the Arduino IDE before starting GroudControl? Did the Firmware upload go well?
Edit1:
One more test please. In the Aduino IDE, after the upload, kindly click on the ‘Magnifying Glas’ (top Right) to open the serial monitor. With a baud rate set to 57600, do you see something like:
<Idle,MPos:0.00,0.00,0.00,WPos:0.000,0.000,0.000>
[PE:0.00,0.00,127]
<Idle,MPos:0.00,0.00,0.00,WPos:0.000,0.000,0.000>
[PE:0.00,0.00,127]
<Idle,MPos:0.00,0.00,0.00,WPos:0.000,0.000,0.000>
[PE:0.00,0.00,127]
<Idle,MPos:0.00,0.00,0.00,WPos:0.000,0.000,0.000>
?
Ignore my numbers here, they might be different, the question is, if that output runs continuously through without loss of connection.
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