Remote Debugging on Raspberry PI via SSH

[ergo]

Hi Aivar,

i like Thonny a lot so far, thanks for making it available and your eager maintenance!

I am currently trying to run and debug a script running on the raspi connected via ssh. The debug function is not available using the remote python interpreter. Which plugin has to be installed or configuration made to make this possible?

Thanks, 

ergo

[Aivar Annamaa]

Hi!

Debugging over SSH is not available at the moment. The code actually supports debugging remote scripts, but remote debugging of local scripts doesn't work yet, so the feature is disabled. You can enable by modifying source code (select "Tools => Open Thonny program folder" and apply this change: https://github.com/thonny/thonny/commit/1f009d53c518dd20833dc866362bc733ec153128).

Best regards,
Aivar

[ergo]

Thanks for your quick answer!

My Python-Script is on the RasPi, Thonny is on my Mac, i am connected via ssh (Run > Select interpreter > Remote Python 3 (SSH)): That sounds like the case of "debugging remote scripts", right?

I added the two lines as provided here https://github.com/thonny/thonny/commit/1f009d53c518dd20833dc866362bc733ec153128 but got the following error:

WARNING thonny.common: Could not get THONNY_FRONTEND_SYS_PATH

Traceback (most recent call last):

  File "/tmp/thonny-backend-3.3.6/thonny/common.py", line 660, in try_load_modules_with_frontend_sys_path

    frontend_sys_path = ast.literal_eval(os.environ["THONNY_FRONTEND_SYS_PATH"])

  File "/usr/lib/python3.7/os.py", line 678, in __getitem__

    raise KeyError(key) from None

KeyError: 'THONNY_FRONTEND_SYS_PATH'

ERROR   thonny.backend: PROBLEM WITH THONNY'S BACK-END

Traceback (most recent call last):

  File "/tmp/thonny-backend-3.3.6/thonny/plugins/cpython/cpython_backend.py", line 1278, in execute_source

    root = self._prepare_ast(source, filename, mode)

  File "/tmp/thonny-backend-3.3.6/thonny/plugins/cpython/cpython_backend.py", line 1736, in _prepare_ast

    ast_utils.mark_text_ranges(root, source)

  File "/tmp/thonny-backend-3.3.6/thonny/ast_utils.py", line 178, in mark_text_ranges

    from asttokens.asttokens import ASTTokens

ModuleNotFoundError: No module named 'asttokens'

I checked installed plugins and asttokens is installed in version 2.0.4.

Any idea how to fix this? 

Thank you for helping here!

[Aivar Annamaa]

Try installing asttokens for your remote interpreter (ie. on Raspberry). If you're using your system Python 3 then you should do "sudo apt install python3-asttokens", if you're using a virtual environment, then "pip install asttokens". You may need to add also jedi ("sudo apt install python3-jedi" or "pip install jedi")

Best regards,
Aivar

[ergo]

Guess we are getting closer...

I installed both (asttokens and jedi) on the raspi and this is what i get from Thonny now:

Traceback (most recent call last):

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/workbench.py", line 1708, in event_generate

    handler(event)

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/plugins/debugger.py", line 1213, in _handle_debugger_progress

    _current_debugger.handle_debugger_progress(msg)

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/plugins/debugger.py", line 276, in handle_debugger_progress

    self._main_frame_visualizer = EditorVisualizer(msg.stack[0])

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/plugins/debugger.py", line 584, in __init__

    get_workbench().get_editor_notebook().show_file(frame_info.filename, set_focus=False)

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/editors.py", line 923, in show_file

    editor = self.get_editor(filename, True)

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/editors.py", line 1012, in get_editor

    return self._open_file(filename)

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/editors.py", line 996, in _open_file

    if editor._load_file(filename):

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/editors.py", line 171, in _load_file

    result = self._load_local_file(filename, keep_undo)

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/thonny/editors.py", line 193, in _load_local_file

    with open(filename, "rb") as fp:

FileNotFoundError: [Errno 2] No such file or directory: '/home/pi/python-projects/smart-timer.py'

[Aivar Annamaa]

Ouch, it looks like we need to stop here for now. When I said the code is ready for debugging remote scripts, I had tried only a single trivial script, but from your stacktrace I infer that you have several scripts in your solution and it looks like the UI part of the debugger is not there yet. 

I'll try to make it working by Thonny 4.0. You can subscribe to https://github.com/thonny/thonny/issues/1814 to get notified of the progress.

Best regards,
Aivar

[ergo]

Ok, thanks for your efforts. Looking forward to v4 !

[ergo]

Aivar, one more question related to debugging a script remotely: Is it possible to debug my script (on the raspi) running Thonny on my Mac while the raspi is connected via USB? I saw no interpreter option to choose a usb-connection...

[Aivar Annamaa]

I haven't tried it, but it should be possible to create SSH connection over USB. See https://howchoo.com/pi/raspberry-pi-gadget-mode or ask in Raspberry's forum.

Best regards,
Aivar