Changing Advertisement and connection intervals at run time? NCS

RE: Changing Advertisement and connection intervals at run time? NCS

dejans — Tue, 25 Jan 2022 17:17:34 GMT

Hi,

After the connection is established, you could start the legacy advertiser again with default parameters by setting BT_ADV_PERSIST. The default connection parameters are defined in compile time and the behavior can be changed in host which is available as open source.

Best regards,
Dejan

RE: Changing Advertisement and connection intervals at run time? NCS

cosmotic_instant — Tue, 25 Jan 2022 09:47:33 GMT

Thank you for the response.

I forgot to mention that my device is a peripheral device.

Using Zephyr, bt_le_adv_resume() gets called in the Bluetooth stack as opposed to something that i can call. That's my problem here. Is how do i tap in to the stack to change these values. When the controller disconnects from my peripheral, bt_le_adv_resume() is called. I want to change the values it reads in t o set up the advertising. The only place i have seen user callable code from adv.c in any example is adv.c. If advertising is already occurring maybe i can call stop, and start again, but it seems a shame to when bt_le_adv_resume() gets called when the disconnection occurs. Seems rather hacky to the immediately call Stop and start functions. I assume it's resuming from already having been stopped (i cannot find the code when adv_stop is called when a connection occurs), so i should be able to change the values the adv.c resume function reads before restarting the advertisement, but i don't know how to access them...

RE: Changing Advertisement and connection intervals at run time? NCS

dejans — Mon, 24 Jan 2022 16:09:22 GMT

Hi,

If you want to update connection parameters of the current connection please look at bt_conn_le_param_update and bt_conn_le_data_len_update. In case you want to update parameters after connection is terminated, your application should have a decision on the parameters, disconnect, and create new connection with desired parameters with bt_conn_le_create.

In addition to bt_le_adv_start() and bt_le_adv_resume(), you can also find bt_le_adv_stop() in adv.c file. bt_le_adv_stop() is also present in bt_rpc_gap_client.c.

Best regards,
Dejan