Hi im having problems with restarting advertising after disconnect. I tried NUS example, simple peripheral example but none of them works.
I modified NUS example with some extra functions but i cannot get it to work.
Unreferencing current connection as advised on forum doesnt help either.
/*
* Copyright (c) 2024 Croxel, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/kernel.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/services/nus.h>
#define DEVICE_NAME "XX45"
#define DEVICE_NAME_LEN (sizeof(DEVICE_NAME) - 1)
static struct bt_conn *current_conn;
static const struct bt_data ad[] = {
BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
};
static const struct bt_data sd[] = {
BT_DATA_BYTES(BT_DATA_UUID128_ALL, BT_UUID_NUS_SRV_VAL),
};
static void notif_enabled(bool enabled, void *ctx)
{
ARG_UNUSED(ctx);
printk("%s() - %s\n", __func__, (enabled ? "Enabled" : "Disabled"));
}
static void received(struct bt_conn *conn, const void *data, uint16_t len, void *ctx)
{
char message[CONFIG_BT_L2CAP_TX_MTU + 1] = "";
ARG_UNUSED(conn);
ARG_UNUSED(ctx);
memcpy(message, data, MIN(sizeof(message) - 1, len));
printk("%s() - Len: %d, Message: %s\n", __func__, len, message);
}
struct bt_nus_cb nus_listener = {
.notif_enabled = notif_enabled,
.received = received,
};
int advertising_start()
{
int err;
err = bt_le_adv_start(BT_LE_ADV_CONN_ONE_TIME, ad, ARRAY_SIZE(ad), sd, ARRAY_SIZE(sd));
if (err) {
printk("Failed to start advertising: %d\n", err);
return err;
}
return 0;
}
static void connected(struct bt_conn *conn, uint8_t err)
{
char addr[BT_ADDR_LE_STR_LEN];
if (err) {
printk("Connection failed, err 0x%02x", err);
return;
}
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
printk("Connected %s", addr);
current_conn = bt_conn_ref(conn);
//dk_set_led_on(CON_STATUS_LED);
}
static void disconnected(struct bt_conn *conn, uint8_t reason)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
printk("Disconnected: %s, reason 0x%02x ", addr, reason );
if (current_conn) {
bt_conn_unref(current_conn);
current_conn = NULL;
//dk_set_led_off(CON_STATUS_LED);
printk("Dereferenced current_conn\n");
advertising_start();
}
}
BT_CONN_CB_DEFINE(conn_callbacks) = {
.connected = connected,
.disconnected = disconnected,
};
int main(void)
{
int err;
printk("Sample - Bluetooth Peripheral NUS\n");
err = bt_nus_cb_register(&nus_listener, NULL);
if (err) {
printk("Failed to register NUS callback: %d\n", err);
return err;
}
err = bt_enable(NULL);
if (err) {
printk("Failed to enable bluetooth: %d\n", err);
return err;
}
advertising_start();
printk("Initialization complete\n");
while (true) {
const char *hello_world = "Hello World!\n";
k_sleep(K_SECONDS(3));
err = bt_nus_send(NULL, hello_world, strlen(hello_world));
printk("Data send - Result: %d\n", err);
if (err < 0 && (err != -EAGAIN) && (err != -ENOTCONN)) {
return err;
}
}
return 0;
}
Data send - Result: -128 Connected 5B:4F:15:AE:C7:0B (random)Data send - Result: -128 notif_enabled() - Enabled notif_enabled() - Disabled Data send - Result: -128 Disconnected: 5B:4F:15:AE:C7:0B (random), reason 0x13 Dereferenced current_conn Failed to start advertising: -12
