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* Copyright (c) 2021 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <device.h>
#include <devicetree.h>
#include <drivers/gpio.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/conn.h>
#define NAME_LEN 30
static bool per_adv_found;
static bt_addr_le_t per_addr;
static uint8_t per_sid;
static struct bt_conn *default_conn;
static K_SEM_DEFINE(sem_conn, 0, 1);
static K_SEM_DEFINE(sem_conn_lost, 0, 1);
static K_SEM_DEFINE(sem_per_adv, 0, 1);
static K_SEM_DEFINE(sem_per_sync, 0, 1);
static bool data_cb(struct bt_data *data, void *user_data)
{
char *name = user_data;
uint8_t len;
switch (data->type) {
case BT_DATA_NAME_SHORTENED:
case BT_DATA_NAME_COMPLETE:
len = MIN(data->data_len, NAME_LEN - 1);
memcpy(name, data->data, len);
name[len] = '\0';
return false;
default:
return true;
}
}
static const char *phy2str(uint8_t phy)
{
switch (phy) {
case 0: return "No packets";
case BT_GAP_LE_PHY_1M: return "LE 1M";
case BT_GAP_LE_PHY_2M: return "LE 2M";
case BT_GAP_LE_PHY_CODED: return "LE Coded";
default: return "Unknown";
}
}
static void scan_recv(const struct bt_le_scan_recv_info *info,
struct net_buf_simple *buf)
{
char le_addr[BT_ADDR_LE_STR_LEN];
char name[NAME_LEN];
int err;
/* only parse devices in close proximity */
if (info->rssi < -70) {
return;
}
(void)memset(name, 0, sizeof(name));
bt_data_parse(buf, data_cb, name);
bt_addr_le_to_str(info->addr, le_addr, sizeof(le_addr));
printk("[DEVICE]: %s, AD evt type %u, Tx Pwr: %i, RSSI %i, name: %s "
"C:%u S:%u D:%u SR:%u E:%u Prim: %s, Secn: %s, "
"Interval: 0x%04x (%u ms), SID: %u\n",
le_addr, info->adv_type, info->tx_power, info->rssi, name,
(info->adv_props & BT_GAP_ADV_PROP_CONNECTABLE) != 0,
(info->adv_props & BT_GAP_ADV_PROP_SCANNABLE) != 0,
(info->adv_props & BT_GAP_ADV_PROP_DIRECTED) != 0,
(info->adv_props & BT_GAP_ADV_PROP_SCAN_RESPONSE) != 0,
(info->adv_props & BT_GAP_ADV_PROP_EXT_ADV) != 0,
phy2str(info->primary_phy), phy2str(info->secondary_phy),
info->interval, info->interval * 5 / 4, info->sid);
/* If connectable, connect */
if (info->adv_props & BT_GAP_ADV_PROP_CONNECTABLE) {
if (default_conn) {
return;
}
printk("Connecting to %s\n", le_addr);
err = bt_le_scan_stop();
if (err != 0) {
printk("Stop LE scan failed (err %d)\n", err);
return;
}
err = bt_conn_le_create(info->addr, BT_CONN_LE_CREATE_CONN,
BT_LE_CONN_PARAM_DEFAULT,
&default_conn);
if (err != 0) {
printk("Failed to connect (err %d)\n", err);
return;
}
} else {
/* If info->interval it is a periodic advertiser, mark for sync */
if (!per_adv_found && info->interval) {
per_adv_found = true;
per_sid = info->sid;
bt_addr_le_copy(&per_addr, info->addr);
k_sem_give(&sem_per_adv);
}
}
}
static struct bt_le_scan_cb scan_callbacks = {
.recv = scan_recv,
};
static void connected(struct bt_conn *conn, uint8_t err)
{
char addr[BT_ADDR_LE_STR_LEN];
int bt_err;
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
if (err != 0) {
printk("Failed to connect to %s (%u)\n", addr, err);
bt_conn_unref(default_conn);
default_conn = NULL;
bt_err = bt_le_scan_start(BT_LE_SCAN_ACTIVE, NULL);
if (bt_err) {
printk("Failed to start scan (err %d)\n", bt_err);
return;
}
return;
}
if (conn != default_conn) {
return;
}
printk("Connected: %s\n", addr);
k_sem_give(&sem_conn);
}
static void disconnected(struct bt_conn *conn, uint8_t reason)
{
char addr[BT_ADDR_LE_STR_LEN];
int err;
if (conn != default_conn) {
return;
}
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
printk("Disconnected: %s (reason 0x%02x)\n", addr, reason);
bt_conn_unref(default_conn);
default_conn = NULL;
k_sem_give(&sem_conn_lost);
err = bt_le_scan_start(BT_LE_SCAN_ACTIVE, NULL);
if (err != 0) {
printk("Failed to start scan (err %d)\n", err);
return;
}
}
static struct bt_conn_cb conn_callbacks = {
.connected = connected,
.disconnected = disconnected,
};
static void sync_cb(struct bt_le_per_adv_sync *sync,
struct bt_le_per_adv_sync_synced_info *info)
{
char le_addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(info->addr, le_addr, sizeof(le_addr));
printk("PER_ADV_SYNC[%u]: [DEVICE]: %s synced, "
"Interval 0x%04x (%u ms), PHY %s\n",
bt_le_per_adv_sync_get_index(sync), le_addr,
info->interval, info->interval * 5 / 4, phy2str(info->phy));
k_sem_give(&sem_per_sync);
}
static void term_cb(struct bt_le_per_adv_sync *sync,
const struct bt_le_per_adv_sync_term_info *info)
{
char le_addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(info->addr, le_addr, sizeof(le_addr));
printk("PER_ADV_SYNC[%u]: [DEVICE]: %s sync terminated\n",
bt_le_per_adv_sync_get_index(sync), le_addr);
}
static void recv_cb(struct bt_le_per_adv_sync *sync,
const struct bt_le_per_adv_sync_recv_info *info,
struct net_buf_simple *buf)
{
char le_addr[BT_ADDR_LE_STR_LEN];
char data_str[129];
bt_addr_le_to_str(info->addr, le_addr, sizeof(le_addr));
bin2hex(buf->data, buf->len, data_str, sizeof(data_str));
printk("PER_ADV_SYNC[%u]: [DEVICE]: %s, tx_power %i, "
"RSSI %i, CTE %u, data length %u, data: %s\n",
bt_le_per_adv_sync_get_index(sync), le_addr, info->tx_power,
info->rssi, info->cte_type, buf->len, data_str);
}
static struct bt_le_per_adv_sync_cb sync_callbacks = {
.synced = sync_cb,
.term = term_cb,
.recv = recv_cb
};
void main(void)
{
struct bt_le_per_adv_sync_param sync_create_param;
struct bt_le_per_adv_sync *sync;
int err;
char le_addr[BT_ADDR_LE_STR_LEN];
printk("Starting Central Periodic Advertising Synchronization Transfer (PAST) Demo\n");
/* Initialize the Bluetooth Subsystem */
err = bt_enable(NULL);
if (err != 0) {
printk("failed to enable BT (err %d)\n", err);
return;
}
printk("Connection callbacks register\n");
bt_conn_cb_register(&conn_callbacks);
printk("Scan callbacks register\n");
bt_le_scan_cb_register(&scan_callbacks);
printk("Periodic Advertising callbacks register\n");
bt_le_per_adv_sync_cb_register(&sync_callbacks);
printk("Start scanning...");
err = bt_le_scan_start(BT_LE_SCAN_ACTIVE, NULL);
if (err != 0) {
printk("failed (err %d)\n", err);
return;
}
printk("success.\n");
do {
printk("Waiting for connection...\n");
err = k_sem_take(&sem_conn, K_FOREVER);
if (err != 0) {
printk("Could not take sem_conn (err %d)\n", err);
return;
}
printk("Connected.\n");
printk("Start scanning for PA...\n");
per_adv_found = false;
err = bt_le_scan_start(BT_LE_SCAN_ACTIVE, NULL);
if (err != 0) {
printk("failed (err %d)\n", err);
return;
}
printk("Scan started.\n");
printk("Waiting for periodic advertising...\n");
err = k_sem_take(&sem_per_adv, K_FOREVER);
if (err != 0) {
printk("Could not take sem_per_adv (err %d)\n", err);
return;
}
printk("Found periodic advertising.\n");
bt_addr_le_to_str(&per_addr, le_addr, sizeof(le_addr));
printk("Creating Periodic Advertising Sync to %s...\n", le_addr);
bt_addr_le_copy(&sync_create_param.addr, &per_addr);
sync_create_param.options = 0;
sync_create_param.sid = per_sid;
sync_create_param.skip = 0;
sync_create_param.timeout = 0xa;
err = bt_le_per_adv_sync_create(&sync_create_param, &sync);
if (err != 0) {
printk("failed (err %d)\n", err);
return;
}
printk("success.\n");
printk("Waiting for periodic sync...\n");
err = k_sem_take(&sem_per_sync, K_FOREVER);
if (err != 0) {
printk("failed (err %d)\n", err);
return;
}
printk("Periodic sync established.\n");
printk("Transferring sync\n");
err = bt_le_per_adv_sync_transfer(sync, default_conn, 0);
if (err != 0) {
printk("Could not transfer sync (err %d)\n", err);
return;
}
printk("Waiting for connection lost...\n");
err = k_sem_take(&sem_conn_lost, K_FOREVER);
if (err != 0) {
printk("Could not take sem_conn_lost (err %d)\n", err);
return;
}
printk("Connection lost.\n");
} while (true);
}
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