How to get full uuids in pc-ble-driver-py?

RE: How to get full uuids in pc-ble-driver-py?

KVAJOH — Wed, 08 May 2019 15:03:30 GMT

I have sort of the same problem. Just got hit with the a Ctrl-C/Ctrl-V from this post.

RE: How to get full uuids in pc-ble-driver-py?

Alex — Thu, 02 May 2019 16:22:52 GMT

While ilw's awesome answer enabled me to debug my issue, it does not actually answer the question of how to access the full discovered UUIDs (which would be very useful for debugging, and for other folks writing scanners). So I'll leave the question open until more people can pitch in.

RE: How to get full uuids in pc-ble-driver-py?

Alex — Thu, 02 May 2019 16:17:56 GMT

ilw, thank you! I did try ble_vs_uuid_add() and that did work. My BASE_UUID bytes were reversed though (probably why notification wasn't working either), I had to reorder them and then it worked okay.

For the Nordic guys:

1. Why is ble_vs_uuid_add necessary? Can't the driver code work with all the UUIDs actually present/discovered, not just the ones it knows? and

2. How does pc-ble-driver-js do this? Clearly the nRF Connect desktop app doesn't have this limitation as it works fine with any UUIDs, and that runs on top of pc-ble-driver-js.

RE: How to get full uuids in pc-ble-driver-py?

ilw — Thu, 02 May 2019 15:18:37 GMT

you need to tell it the base vendor specific id before it will properly populate the characteristic/service uuids.

See the NUS collector example by Jørgen Holmefjord devzone.nordicsemi.com/.../how-to-use-pca10040-as-dongle-scanner

the line:

self.adapter.driver.ble_vs_uuid_add(BASE_UUID)

is crucial...

Then you can print out lots of info with:

for s in self.adapter.db_conns[new_conn].services:
print(str(s))
for c in s.chars :
print(str(c))

RE: How to get full uuids in pc-ble-driver-py?

ilw — Thu, 02 May 2019 12:54:54 GMT

Sorry i don't have an answer, but I am coincidentally wondering exactly the same thing today.

Edit: made a mistake...