bleak Multiple Characteristics with this UUID | adafruit | Page 1

merry plaza Aug 25, 2021, 5:33 AM

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I'm wondering if this is a bug in the new CP version that advertises (is that the right term?) multiple characteristics for the UART uuid?

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Bleak's usage docs https://bleak.readthedocs.io/en/latest/usage.html have a note at the top stating "specifying characteristics by UUID or string representation of it might not always work in bleak version > 0.7.0" -- adafruit-blinka-bleio depends on bleak 0.11.0 so we would be in this boat

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I poked around in blinka-bleio and _bleio a bit and things are very uuid-oriented in there so switching to reference characteristics by handle seems like it would be a big undertaking. Hoping for an easy resolution

keen spade Aug 25, 2021, 2:21 PM

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@merry plaza is your host computer Windows, Mac, or Linux?

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this is possibly an issue, but I thought connecting only to the appropriate advertisement would work out. We need to test this agin. Could you file an issue with the details against https://github.com/adafruit/Adafruit_Blinka_bleio ? Thanks

merry plaza Aug 25, 2021, 3:09 PM

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filed https://github.com/adafruit/Adafruit_Blinka_bleio/issues/37 -- please let me know if any additional detail is needed

GitHub

"BleakError: Multiple Characteristics with this UUID" under Circuit...

When following the BLE UART eval example, the host-computer program crashes with "bleak.exc.BleakError: Multiple Characteristics with this UUID, refer to your desired characteristic by the...

median sedge Aug 25, 2021, 5:08 PM

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cp 7.x has a uart service for circuitpython itself now

merry plaza Aug 25, 2021, 8:15 PM

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Thanks for taking a look @median sedge -- do you know if there's a way I can work around this in the mean time?

median sedge Aug 25, 2021, 8:15 PM

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simplest is to disable the workflow from cp

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which is supervisor.disable_ble_workflow() iirc

merry plaza Aug 26, 2021, 3:15 PM

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That worked! thanks again

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also TIL about the supervisor module

median sedge Aug 26, 2021, 4:58 PM

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🙂

merry plaza Aug 30, 2021, 4:17 AM

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Resurrecting this thread-- supervisor.disable_ble_workflow() worked perfectly when the board was plugged in to usb, but when I try to run the same code on battery power I get the "Multiple Characteristics with this UUID" error again. Any idea why this might be happening?

median sedge Aug 30, 2021, 4:44 PM

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is it in safe mode? I think I'll switch the UUID of the CP serial.

merry plaza Aug 30, 2021, 10:17 PM

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it is not in safe mode as far as I know - I believe the leds would be yellow if it was in safe mode

median sedge Aug 30, 2021, 11:59 PM

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ya, I think so too

#bleak Multiple Characteristics with this UUID