Adafruit CircuitPython 5.0.0-rc.0 on 2020-02-26; Adafruit Feather M4 Express with samd51j19
>>> import bluefruitspi_simpletest
Initializing the Bluefruit LE SPI Friend module
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "bluefruitspi_simpletest.py", line 19, in <module>
  File "adafruit_bluefruitspi.py", line 253, in command_check_OK
  File "adafruit_bluefruitspi.py", line 248, in command
  File "adafruit_bluefruitspi.py", line 248, in command
RuntimeError: AT command failure: RuntimeError('buffer size must match format',)
>>>