sd_ble_gap_adv_start error return

[Gus Gustafson]

Trying to start an advertise, code snippet below: static void advertising_start (void) { uint32_t err_code; ble_gap_adv_params_t adv_params;

memset (&adv_params, 0, sizeof (adv_params));

adv_params.type        = BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
adv_params.p_peer_addr = NULL;
adv_params.fp          = BLE_GAP_ADV_FP_ANY; //filter policies
adv_params.p_whitelist = NULL;
adv_params.interval    = ADV_INTERVAL;
adv_params.timeout     = ADV_TIMEOUT_IN_SECONDS;

err_code = sd_ble_gap_adv_start (&adv_params);  // Start advertising
APP_ERROR_CHECK (err_code);

} returns error code 7, NRF_ERROR_INVALID_PARAM. interval is set to 1920 decimal, and timeout is 0. Looks like it should work, what am I missing here?

[Ole Morten]

If you try to do infinite advertising, you must make sure that you have your flags set correctly. The Bluetooth specification forbids more than 180 s advertising if you have the Limited Discoverable flag set, so you should make sure to not have it.

Instead you should use either BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE or BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED. The latter is the one you should use for broadcasting devices, while the former should be used if your device wants to initiate a connection, but wants to stay advertising forever.

[Gus Gustafson]

Looking back, I had set flags in more than one place and one of them was wrong, this at least got me searching for the correct thing.