CUSTOM UUID DISCOVERY

RE: CUSTOM UUID DISCOVERY

Mehrdad — Tue, 25 Jun 2019 10:50:09 GMT

Hi,

Yes, I did. I can quickly let you know what I did. only one question, are you using pc-ble-driver?

1. First, defined vendor specific uuid and the service

2. Second, added this service to BLE stack and then started service discovery

Hope can be helpful.

RE: CUSTOM UUID DISCOVERY

LCC — Tue, 25 Jun 2019 09:22:39 GMT

Hi Mehrdad,

May i know how did you managed to find the custom uuid? I managed to find a few which are 16 bits but i am unable to find those with 128 bits.

Your help is greatly appreciated.

RE: CUSTOM UUID DISCOVERY

Mehrdad — Tue, 09 Apr 2019 15:46:34 GMT

Thanks a lot for the following up. I solved the problem and I had to write the service discovery myself since all the characteristics are not discovered at once.

RE: CUSTOM UUID DISCOVERY

Simonr — Mon, 25 Mar 2019 09:45:42 GMT

Hi Mehrdad

I of course meant ble_gatt_db.h file, so if you didn't see past my typo please use that header file. If it isn't supported you should have a look at how the BLE_GATT_DB_MAX_CHARS is implemented, to see how exactly it changes the maximum characteristics discoverable.

Best regards,

Simon

RE: CUSTOM UUID DISCOVERY

Mehrdad — Fri, 22 Mar 2019 14:58:54 GMT

Hi again,

Yes, it is a central app that I am developing in Windows. Unfortunately, pc ble driver in c++ does not support gat_db discoveries and its dependencies are not included

RE: CUSTOM UUID DISCOVERY

Simonr — Fri, 22 Mar 2019 14:40:05 GMT

Hi Mehrdad

Is this a central application? If so, could you try adding this define to the ble_gat_db.h header file?

#define BLE_GATT_DB_MAX_CHARS

Best regards,

Simon

RE: CUSTOM UUID DISCOVERY

Mehrdad — Fri, 22 Mar 2019 14:18:26 GMT

Hi Simon,

Thanks for the helpful solution. I know the custom UUID in the server, and I implemented the discovery. Now, my problem is all the characteristics are not discovered. Only the first one in the service is discovered. I have another SIG-adopted service (device information service), and the client can only discover three of the characteristics. The interesting point for me is it can find the start handle and the last one correctly, but it only returns three of them. Do you know what the problem is?

RE: CUSTOM UUID DISCOVERY

Simonr — Fri, 22 Mar 2019 11:45:37 GMT

If this is a known UUID, you should add it to your list of vendor specific UUID's prior to the service discovery. You will then get the UUID back with the UUID type. If you don't know the vendor specific UUID, you should use the sd_ble_gattc_attr_info_discover function to get the UUID. (I am not sure if the latter function is supported in pc-ble-driver, but please give it a try.

Best regards,

Simon