[AE-15] Commander.py script: cobs.cobs.DecodeError: not enough input bytes for length code

[aliphys]

Description of defect

Upon running the Commander.py script, the cobs.cobs.DecodeError: not enough input bytes for length code error is displayed.

PS D:\Github\aliphys\nicla-sense-me-fw\Arduino_BHY2\examples\DataHarvester\extras\Commander> & C:/Users/user/AppData/Local/Programs/Python/Python39/python.exe d:/Github/aliphys/nicla-sense-me-fw/Arduino_BHY2/examples/DataHarvester/extras/Commander/Commander.py COM23 test phys
Running...
> Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\threading.py", line 950, in _bootstrap_inner
    self.run()
  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\threading.py", line 888, in run
    self._target(*self._args, **self._kwargs)
  File "d:\Github\aliphys\nicla-sense-me-fw\Arduino_BHY2\examples\DataHarvester\extras\Commander\Commander.py", line 88, in receiver       
    decoded = cobs.decode(data[0:(n - 1)])
cobs.cobs.DecodeError: not enough input bytes for length code

nicla-sense-me-fw/Arduino_BHY2/examples/DataHarvester/extras/Commander/Commander.py

Line 88 in f42f361

decoded = cobs.decode(data[0:(n - 1)])

This may related to truncated data coming from the DataHarvester.ino file?

Target(s) affected by this defect ?

Nicla Sense ME

Toolchain(s) (name and version) displaying this defect ?

What version of Mbed-os are you using (tag or sha) ?

What version(s) of tools are you using. List all that apply (E.g. mbed-cli)

How is this defect reproduced ?

• Ensure all required modules are installed via pip
• Use arduino-cli to identify the COM port
• In the terminal, run python [COMPORT] test phys
• Press r then enter to start data aquisition

nicla-sense-me-fw/Arduino_BHY2/examples/DataHarvester/extras/Commander/Commander.py

Lines 55 to 62 in f42f361

	if cmd == 'R':
	running = True
	today = datetime.today()
	iso = datetime.isoformat(today)
	filename = f'{name}_{tag}_{iso}.csv'
	f = open(filename, 'wt')
	print(f'timestamp,accX,accY,accZ', file=f)
	cmd = 'N'

[sebromero]

@manchoz Any idea what's going wrong here?

[manchoz]

Something might be changed in the PacketSerial or Python COBS library. @aliphys can you try changing the n-1 index to n at line 88?

Is the same issue present on MacOS or GNU/Linux?

Also check for data being sent correctly from the Nicla Sense ME.

[aliphys]

Something might be changed in the PacketSerial or Python COBS library. @aliphys can you try changing the n-1 index to n at line 88?

Changing the n-1 index to n at line 88 leads to a zero byte found in input error

PS D:\Github\aliphys\nicla-sense-me-fw> & C:/Users/user/AppData/Local/Programs/Python/Python39/python.exe d:/Github/aliphys/nicla-sense-me-fw/Arduino_BHY2/examples/DataHarvester/extras/Commander/Commander.py 
COM27 test Physics
> r
Running...
> Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\threading.py", line 950, in _bootstrap_inner
    self.run()
  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\threading.py", line 888, in run        
    self._target(*self._args, **self._kwargs)
  File "d:\Github\aliphys\nicla-sense-me-fw\Arduino_BHY2\examples\DataHarvester\extras\Commander\Commander.py", line 88, in receiver
    decoded = cobs.decode(data[0:(n)]) #decoded = cobs.decode(data[0:(n - 1)])
cobs.cobs.DecodeError: zero byte found in input