BLE services limited to 3

[robgar2001]

• The Pycom board you are using. WiPy

• (sysname='WiPy', nodename='WiPy', release='1.20.2.r6', version='v1.11-c5a0a97 on 2021-10-28', machine='WiPy with ESP32')

• Exact steps to cause this issue

  1. The services we created a ble gatt server side: Service A : Contains 11 characteristics Service B : Contains 9 characteristics Services C, D, E, F : Each contain 5 characteristics

  2. We push values into each characteristic

  3. We look with a ble analyser at the services and characteristics

• Wat we expected: To see all values updated when the ble analyser app reads them out

• Wat happened instead: Services A, B and D show the correct values, the other ones are all zero. They show up, but just all zero when we read them out.

Thank you!

[msariisik]

Hi @robgar2001 ,

I tried to reproduce your problem. Are you stating the number of characteristics with nbr_chars argument while creating service? srv1 = bluetooth.service(uuid=srv1_uuid, isprimary=True, nbr_chars=11)

If this is not the missing part, can you provide your basic code to reproduce the problem?

[robgar2001]

Hi @msariisik ,

Thanks for the response! We located the issue. It was probably due to a strange memory problem with dictionaries. All our characteristics where present, the default values could be read. The new values could also be read server-side when changed. When we realised this, we starting thinking of a memory problem.

All services and characteristics are kept in a dictionary when the BLE object in them. The dictionary part for service A and B are created beforehand, the parts for services C,D,E,F are added dynamically. This was done by assigning parts of a template. The template was kept as a class variable.

When we created a new object instead of assigning a part of the template, it worked fine.

If you are still intresseted to find out why, I am willing to create a reproduceable script.

Kind regards, robgar2001