I'm trying to create a demo beacon with an advertising interval of 5s and I only ever see a single advertisement from the device, following boot up. I've encountered this both on a custom app and when modifying the zephyr BLE beacon sample. I've encountered this on both NCS 2.6.1 & 2.7.0. AFAIK a 5s advertising interval is valid per the BLE spec.
My app:
main.c
#include <zephyr/bluetooth/bluetooth.h>
// Advertising interval = 0x1F38 * 0.625 ms = 4995 ms
// Intervals also have an added 0 to 10 ms random delay.
#define ADV_INTVL (0x1F38)
#define SERIAL_NUMBER "ACEA11ED240286"
static const struct bt_data ad[] = {
BT_DATA(BT_DATA_NAME_COMPLETE, SERIAL_NUMBER,
sizeof(SERIAL_NUMBER) - 1),
};
static bool call_enable = true;
static void bt_ready(int err)
{
if (err) return;
struct bt_le_adv_param adv_param = BT_LE_ADV_PARAM_INIT(
BT_LE_ADV_OPT_USE_NRPA, ADV_INTVL, ADV_INTVL, NULL);
err = bt_le_adv_start(&adv_param, ad, ARRAY_SIZE(ad), NULL, 0);
if (err) {
bt_disable();
} else {
call_enable = false;
}
}
int main(void)
{
int err;
while (call_enable) {
err = bt_enable(bt_ready);
if (err) {
call_enable = true;
}
}
return 0;
}
prj.conf:
CONFIG_BT=y CONFIG_BT_BROADCASTER=y CONFIG_DEBUG=y CONFIG_DEBUG_INFO=y CONFIG_DEBUG_THREAD_INFO=y CONFIG_ASSERT=y
Modified zephyr BLE sample main.c:
/* main.c - Application main entry point */
/*
* Copyright (c) 2015-2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/types.h>
#include <stddef.h>
#include <zephyr/sys/printk.h>
#include <zephyr/sys/util.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/hci.h>
#define DEVICE_NAME CONFIG_BT_DEVICE_NAME
#define DEVICE_NAME_LEN (sizeof(DEVICE_NAME) - 1)
/*
* Set Advertisement data. Based on the Eddystone specification:
* https://github.com/google/eddystone/blob/master/protocol-specification.md
* https://github.com/google/eddystone/tree/master/eddystone-url
*/
static const struct bt_data ad[] = {
BT_DATA_BYTES(BT_DATA_FLAGS, BT_LE_AD_NO_BREDR),
BT_DATA_BYTES(BT_DATA_UUID16_ALL, 0xaa, 0xfe),
BT_DATA_BYTES(BT_DATA_SVC_DATA16,
0xaa, 0xfe, /* Eddystone UUID */
0x10, /* Eddystone-URL frame type */
0x00, /* Calibrated Tx power at 0m */
0x00, /* URL Scheme Prefix http://www. */
'z', 'e', 'p', 'h', 'y', 'r',
'p', 'r', 'o', 'j', 'e', 'c', 't',
0x08) /* .org */
};
/* Set Scan Response data */
static const struct bt_data sd[] = {
BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
};
static void bt_ready(int err)
{
char addr_s[BT_ADDR_LE_STR_LEN];
bt_addr_le_t addr = {0};
size_t count = 1;
if (err) {
printk("Bluetooth init failed (err %d)\n", err);
return;
}
printk("Bluetooth initialized\n");
struct bt_le_adv_param params = BT_LE_ADV_PARAM_INIT(BT_LE_ADV_OPT_USE_IDENTITY,
0x1f38, 0x1f39, NULL);
/* Start advertising */
err = bt_le_adv_start(¶ms, ad, ARRAY_SIZE(ad),
sd, ARRAY_SIZE(sd));
if (err) {
printk("Advertising failed to start (err %d)\n", err);
return;
}
/* For connectable advertising you would use
* bt_le_oob_get_local(). For non-connectable non-identity
* advertising an non-resolvable private address is used;
* there is no API to retrieve that.
*/
bt_id_get(&addr, &count);
bt_addr_le_to_str(&addr, addr_s, sizeof(addr_s));
printk("Beacon started, advertising as %s\n", addr_s);
}
int main(void)
{
int err;
printk("Starting Beacon Demo\n");
/* Initialize the Bluetooth Subsystem */
err = bt_enable(bt_ready);
if (err) {
printk("Bluetooth init failed (err %d)\n", err);
}
return 0;
}
