_bleio does not accept data as a kwarg in start_advertising

[SomTambe]

CircuitPython version

Adafruit CircuitPython v 7.0.0

Code/REPL

import _bleio

adp = _bleio.adapter
msg = bytes('abcde', 'utf-8')
adp.start_advertising(data=msg, # msg is of bytes type
                      connectable=True, 
                      anonymous=True, 
                      timeout=30, 
                      interval=0.1, 
                      tx_power=4)

Behavior

Traceback (most recent call last):
  File "\<stdin\>", line 5, in \<module\>
TypeError: function missing 1 required positional arguments

Description

It works when I pass msg as a normal argument:

adp.start_advertising(msg,
                       connectable=True,
                       anonymous=True,
                       timeout=30,
                       interval=0.1,
                       tx_power=4)
Traceback (most recent call last):
  File "<stdin>", line 5, in <module>
_bleio.BluetoothError: Unknown system firmware error: 0009 

Should have worked in the previous case also, especially when the docs show it as a kwarg.

PS: If you could also help me resolve the _bleio.BluetoothError: Unknown system firmware error: 0009, that would be great! I tried sending a blank string payload, it worked, but it is not working if I send any other string. What should I do?

Additional information

Board: Adafruit nRF52840 Bluefruit Feather Sense

[dhalbert]

PS: If you could also help me resolve the _bleio.BluetoothError: Unknown system firmware error: 0009, that would be great! I tried sending a blank string payload, it worked, but it is not working if I send any other string. What should I do?

The data you're trying to send is an ill-formed advertisement. An advertisement contains chunks of data in a specific format, with type and length bytes, etc. If you use the https://github.com/adafruit/Adafruit_CircuitPython_BLE library, it will help you build up these advertisements.

The keyword arg thing is another problem, which we'll look at in more detail. We may open a more general issue for that.

[dhalbert]

Closing in favor of #5407.