zephyr indication registration & enable

[mrowe]

I am operating as a Central.  How do I register and enable a discovered characteristic's indication?

I do the following and the subscribe passes but then the kernel crashes provides a warning and then crashes.

uint16_t auth_desc_handle = 0;
struct bt_gatt_subscribe_params auth_subscribe_req;

if ( (auth_desc_handle = get_descriptor_handle(BLE_UUID_DXCM_AUTH)) != 0)
{
auth_subscribe_req.notify = cb_indicate_auth;
auth_subscribe_req.value = BT_GATT_CCC_INDICATE;
auth_subscribe_req.ccc_handle = auth_desc_handle;

if ( (err = bt_gatt_subscribe(conn, &auth_subscribe_req)) >= 0)
{
printk(" .. Auth Service Registered\n");
return(true);
}
}

.. Auth Service Registered
[00:00:25.559,112] <wrn> bt_ctlr_hci: handle: 0x0000, CSA: 0.

[Håkon Alseth]

Hi,

 

We recommend that you contact the zephyr community regarding the applications in their code base: https://www.zephyrproject.org/developers/how-to-contribute/

[00:00:25.559,112] <wrn> bt_ctlr_hci: handle: 0x0000, CSA: 0.

CSA stands for "channel selection algorithm", and I assume that this is a generic warning stating that your link is using the older algorithm. This is likely not related to the crash. 

How do I register and enable a discovered characteristic's indication?

 The sequence in this example (https://github.com/zephyrproject-rtos/zephyr/blob/master/samples/bluetooth/central_hr/src/main.c#L43) is that you discover the UUIDs you want, then if you have found them all; you subscribe for CCCD.

 

Kind regards,

Håkon