content of bt_gatt_attr->user_data?

[miked531]

I have been exploring BLE and I am using bt_gatt_discover in my zephyr-based central device (nrf9160) to list the services on a Thingy:52. I am getting the callbacks as expected and I see that bt_gatt_attr->user_data is a pointer to something that I probably care about. How do I know what type of data is at the pointer?

I just want to enumerate the services, characteristics, etc on the device so I can understand what's going on with BLE.

Mike

[Amanda Hsieh]

Hi, 

bt_gatt_attr is provided by Zephyr instead of SDK. You should look for the help on https://www.zephyrproject.org/  

-Amanda

[miked531]

for anybody interested in the answer, the only information I could find is looking through nrf/subsys/bluetooth/gatt_dm.c where it will give you the answers you need. short answer is that it varies for service/characterstic/etc