Re: Key Morse to be connected to a laptop
there is no connection via serial. You have to use a keyboard emulation as if it was a USB keyboard. This is available since version v4.11.5: https://github.com/f4exb/sdrangel/releases/tag/v4.11.5
This was an implementation of this issue: https://github.com/f4exb/sdrangel/issues/385
You may find more information in the text of this issue.