Add debug interpreter flag

[rsora]

NOTE: This PR requires arduino/ArduinoCore-samd#506 to be merged

This PR:

• Removes Updates ugly Fix paths handling for gdb #597 hotfix
• Adds --interpreter flag and protobuf property to select the desired debug commands interpreter
• Removes mandatory port property, not always necessary to use the debugger
• Updates the client example accordingly

[rsora]

cc @spoenemann

[per1234]

Should the interpreter property be documented in https://arduino.github.io/arduino-cli/platform-specification/?

[cmaglie]

Should the interpreter property be documented in https://arduino.github.io/arduino-cli/platform-specification/?

Yes.

Also the --interpreter flag is gdb-specific, the real question is: are we going to ever support anything different from a GDB server for the debugger?

If the answer is no, as I think, then we should also state explicitly in the docs and in the cli help that the debug command will start a GDB server session with whatever middleware is needed.

Probably is a good idea to change a bit the recipes in the platform.txt from tools.gdb.debug.pattern to something like tools.openocd.debug.pattern (since we will always use gdb and what changes is the middleware).

[cmaglie]

from tools.gdb.debug.pattern to something like tools.openocd.debug.pattern

or maybe tools.gdb-openocd.debug.pattern?

[rsora]

If the answer is no, as I think, then we should also state explicitly in the docs and in the cli help that the debug command will start a GDB server session with whatever middleware is needed.

We are already doing it here, is that correct?

[cmaglie]

We are already doing it here, is that correct?

Yes

[cmaglie]

👍 👍