Not possible to re-start advertising

[muli]

With the latest SDK 2.6.0, I am developing from the existing NRF5340 audio application for a receiver, to allow an ACL connection from a mobile app. Advertising starts fine, connection gets established from the central app without issues. 

The problem I am having is that when the app manually disconnects itself from the receiver, advertising tries to start again, but can not with the following issue : 

<err> bt_mgmt_adv: Failed to start advertising set. Err: -12

This means not enough core. 

I have tried to resolve this by calling bt_le_ext_adv_stop() and even bt_le_ext_adv_delete() in bt_mgmt_adv_start() before bt_le_ext_adv_create() gets called. This didn't solve it.

I have also tried to solve it by calling bt_le_ext_adv_stop() right before bt_le_ext_adv_start() inside advertising_process().

The same -12 error occurs no matter what. Everything else inside advertising_process() executes without an error , and only bt_le_ext_adv_start() fails. 

At this stage i'm not sure if it's an issue with the SDK or I am doing something wrong. Thanks in advance for any support. 

[IvanR]

void disconnected(struct bt_conn* disconn, uint8_t reason) {
  if (conn) {
    bt_conn_unref(conn);
    conn = NULL;
  }

  printErr("Disconnected (reason %u)", reason);

  struct bt_data device_name_data = {
    .type     = BT_DATA_NAME_SHORTENED,
    .data_len = strlen(device_name),
    .data     = (const uint8_t*)device_name
  };

  ad[1] = device_name_data;

  // Start advertising again
  // int err = bt_le_adv_start(BT_LE_ADV_CONN_NAME, ad, ARRAY_SIZE(ad), NULL, 0);
  int err = bt_le_adv_start(BT_LE_ADV_CONN, ad, ARRAY_SIZE(ad), sd, ARRAY_SIZE(sd));
  if (err)
    report_and_halt("Advertising failed to start (Error %d)", err);
  else
    printLargeInfo("Advertising started");
}

Try this

[muli]

Hi IvanR 

I can't use the function bt_le_adv_start() in my case due to previous issues. 

Advertising must start by calling bt_mgmt_adv_start() which calls bt_le_ext_adv_create()