bt_gatt_discover() always returns empty attribute argument to callback function

RE: bt_gatt_discover() always returns empty attribute argument to callback function

Orlin — Thu, 24 Jul 2025 08:26:53 GMT

Also of note - despite it not being documented anywhere, the start_handle and end_handle members need to be set explicitly, otherwise the callback immediately gets attr NULL and exits. If unsure which handles you'd be looking for, you can use the macros BT_ATTR_FIRST ATTRIBUTE_HANDLE and BT_ATTR_LAST_ATTRIBUTE_HANDLE.

RE: bt_gatt_discover() always returns empty attribute argument to callback function

Orlin — Wed, 23 Jul 2025 19:08:13 GMT

The problem is in the way I was trying to access the service handles and any other information. After finding this stackoverflow post: https://stackoverflow.com/questions/78816822/discover-custom-uuid-services-characteristics-and-cccds-with-zephyr-rtos-as-a , it turns out you can (and should at least from what little i can find) just access the members of the attr struct directly.