Advertiser can't restart unless deprecated macro BT_LE_ADV_CONN is used (Central & Peripheral are both active)

[Riley-Cameron]

*Note that this is only an issue when the central and peripheral are simultaneously active.

This is my current setup for starting advertising, but it requires a deprecated macro:

err = bt_le_adv_start( BT_LE_ADV_CONN, // YES this is deprecated. There is a bug (or unclear usage req) that leaves "adv*" NULL when this isn't used.
                                       // and prevents the advertiser from restarting. 
                                       // see: https://github.com/zephyrproject-rtos/zephyr/blob/8e5e9922c5c428d457568e317256894efccce078/subsys/bluetooth/host/adv.c#L1526N
                       ble_adv_data,  ARRAY_SIZE(ble_adv_data), 
                       ble_scan_data, ARRAY_SIZE(ble_scan_data) );

The macro description recommends using BT_LE_ADV_CONN_FAST_1 or BT_LE_ADV_CONN_FAST_2 instead, but when I use either one I am unable to restart advertising after stopping once. It fails with err -12 (-ENOMEM).

Is there a way to make this work without using the deprecated macro?

Thanks!

- Riley

[Vidar Berg]

Hello,

The application should not attempt to restart advertising until the connection object has been released which occurs after the program returns from the disconnect callback. I recommend having a look at how this is handled in your peripheral samples:

https://github.com/nrfconnect/sdk-nrf/commit/52eeb6a4891bbe0f0e53556d3771fb9757dc2c61#diff-f47fe2875c076577c72f560aa45af653d7323c1db2542451924de29044333b3d 

https://github.com/nrfconnect/sdk-nrf/blob/52eeb6a4891bbe0f0e53556d3771fb9757dc2c61/samples/bluetooth/peripheral_uart/src/main.c#L417 

Best regards,

Vidar

[Riley-Cameron]

Hi Vidar,

Thank you for the quick response!

I moved my advertising control outside of the ISR context and got it working with the BT_LE_ADV_CONN_FAST_1 macro. 

I have two questions:

1. I noticed that this example never explicitly stops advertising. Does it stop automatically when a connection is established? sdk-nrf/samples/bluetooth/peripheral_lbs/src/main.c at 52eeb6a4891bbe0f0e53556d3771fb9757dc2c61 · nrfconnect/sdk-nrf · GitHub

2. Currently I am explicitly stopping advertising when a connection is established, but I always get this error: "[00:02:29.598,242] <err> bt_adv: No valid legacy adv" What is causing that?