Hi
I am using HCI Power Control sample to dynamically control TX power. I found that the TX side's connection RSSI and RX side's are diferent, at some point it even has 20 db difference! Which one is the correct one?
My TX code:
/* main.c - Application main entry point */
/*
* Copyright (c) 2019 Andrei Stoica
*
* 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/sys/byteorder.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/hci.h>
#include <zephyr/bluetooth/hci_vs.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/uuid.h>
#include <zephyr/bluetooth/gatt.h>
//#include <zephyr/bluetooth/services/hrs.h>
#include <bluetooth/services/nus.h>
static struct bt_conn *default_conn;
static uint16_t default_conn_handle;
#define DEVICE_NAME CONFIG_BT_DEVICE_NAME
#define DEVICE_NAME_LEN (sizeof(DEVICE_NAME) - 1)
/* 虚拟命令字符串 */
static const char cmd_str[] = "123456789";
/* Advertising 数据 */
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_VAL),
};
#define DEVICE_BEACON_TXPOWER_NUM 8
static struct k_thread pwr_thread_data;
static K_THREAD_STACK_DEFINE(pwr_thread_stack, 512);
static const int8_t txpower[DEVICE_BEACON_TXPOWER_NUM] = {4, 0, -3, -8,
-15, -18, -23, -30};
static const struct bt_le_adv_param *param =
BT_LE_ADV_PARAM(BT_LE_ADV_OPT_CONNECTABLE | BT_LE_ADV_OPT_ONE_TIME, 0x0020, 0x0020, NULL);
/* NUS 收到数据回调 */
static void bt_receive_cb(struct bt_conn *conn, const uint8_t *const data, uint16_t len)
{
printk("NUS Received: %.*s\n", len, data);
}
/* NUS 回调结构 */
static struct bt_nus_cb nus_cb = {
.received = bt_receive_cb,
};
/* 定时发送函数 */
static void nus_notify(void)
{
if (default_conn) {
int err = bt_nus_send(default_conn, cmd_str, sizeof(cmd_str) - 1);
if (err == -ENOMEM) {
printk("Failed to send NUS data: Out of memory (err %d)\n", err);
} else if (err) {
printk("Failed to send NUS data (err %d)\n", err);
} else {
printk("NUS Sent: %s\n", cmd_str);
}
} else {
printk("No active connection, skipping send\n");
}
}
static void read_conn_rssi(uint16_t handle, int8_t *rssi)
{
struct net_buf *buf, *rsp = NULL;
struct bt_hci_cp_read_rssi *cp;
struct bt_hci_rp_read_rssi *rp;
int err;
buf = bt_hci_cmd_create(BT_HCI_OP_READ_RSSI, sizeof(*cp));
if (!buf) {
printk("Unable to allocate command buffer\n");
return;
}
cp = net_buf_add(buf, sizeof(*cp));
cp->handle = sys_cpu_to_le16(handle);
err = bt_hci_cmd_send_sync(BT_HCI_OP_READ_RSSI, buf, &rsp);
if (err) {
printk("Read RSSI err: %d\n", err);
return;
}
rp = (void *)rsp->data;
*rssi = rp->rssi;
net_buf_unref(rsp);
}
static void set_tx_power(uint8_t handle_type, uint16_t handle, int8_t tx_pwr_lvl)
{
struct bt_hci_cp_vs_write_tx_power_level *cp;
struct bt_hci_rp_vs_write_tx_power_level *rp;
struct net_buf *buf, *rsp = NULL;
int err;
buf = bt_hci_cmd_create(BT_HCI_OP_VS_WRITE_TX_POWER_LEVEL,
sizeof(*cp));
if (!buf) {
printk("Unable to allocate command buffer\n");
return;
}
cp = net_buf_add(buf, sizeof(*cp));
cp->handle = sys_cpu_to_le16(handle);
cp->handle_type = handle_type;
cp->tx_power_level = tx_pwr_lvl;
err = bt_hci_cmd_send_sync(BT_HCI_OP_VS_WRITE_TX_POWER_LEVEL,
buf, &rsp);
if (err) {
printk("Set Tx power err: %d\n", err);
return;
}
rp = (void *)rsp->data;
printk("Actual Tx Power: %d\n", rp->selected_tx_power);
net_buf_unref(rsp);
}
static void get_tx_power(uint8_t handle_type, uint16_t handle, int8_t *tx_pwr_lvl)
{
struct bt_hci_cp_vs_read_tx_power_level *cp;
struct bt_hci_rp_vs_read_tx_power_level *rp;
struct net_buf *buf, *rsp = NULL;
int err;
*tx_pwr_lvl = 0xFF;
buf = bt_hci_cmd_create(BT_HCI_OP_VS_READ_TX_POWER_LEVEL,
sizeof(*cp));
if (!buf) {
printk("Unable to allocate command buffer\n");
return;
}
cp = net_buf_add(buf, sizeof(*cp));
cp->handle = sys_cpu_to_le16(handle);
cp->handle_type = handle_type;
err = bt_hci_cmd_send_sync(BT_HCI_OP_VS_READ_TX_POWER_LEVEL,
buf, &rsp);
if (err) {
printk("Read Tx power err: %d\n", err);
return;
}
rp = (void *)rsp->data;
*tx_pwr_lvl = rp->tx_power_level;
net_buf_unref(rsp);
}
static void connected(struct bt_conn *conn, uint8_t err)
{
char addr[BT_ADDR_LE_STR_LEN];
int8_t txp;
int ret;
if (err) {
printk("Connection failed, err 0x%02x %s\n", err, bt_hci_err_to_str(err));
} else {
default_conn = bt_conn_ref(conn);
ret = bt_hci_get_conn_handle(default_conn,
&default_conn_handle);
if (ret) {
printk("No connection handle (err %d)\n", ret);
} else {
/* Send first at the default selected power */
bt_addr_le_to_str(bt_conn_get_dst(conn),
addr, sizeof(addr));
printk("Connected via connection (%d) at %s\n",
default_conn_handle, addr);
get_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_CONN,
default_conn_handle, &txp);
printk("Connection (%d) - Initial Tx Power = %d\n",
default_conn_handle, txp);
set_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_CONN,
default_conn_handle,
BT_HCI_VS_LL_TX_POWER_LEVEL_NO_PREF);
get_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_CONN,
default_conn_handle, &txp);
printk("Connection (%d) - Tx Power = %d\n",
default_conn_handle, txp);
}
}
}
static void disconnected(struct bt_conn *conn, uint8_t reason)
{
printk("Disconnected, reason 0x%02x %s\n", reason, bt_hci_err_to_str(reason));
if (default_conn) {
bt_conn_unref(default_conn);
default_conn = NULL;
}
}
BT_CONN_CB_DEFINE(conn_callbacks) = {
.connected = connected,
.disconnected = disconnected,
};
static void bt_ready(int err)
{
if (err) {
printk("Bluetooth init failed (err %d)\n", err);
return;
}
printk("Bluetooth initialized\n");
/* Start advertising */
err = bt_le_adv_start(param, ad, ARRAY_SIZE(ad),
sd, ARRAY_SIZE(sd));
if (err) {
printk("Advertising failed to start (err %d)\n", err);
return;
}
printk("Dynamic Tx power Beacon started\n");
}
void modulate_tx_power(void *p1, void *p2, void *p3)
{
int8_t txp_get = 0;
uint8_t idx = 0;
while (1) {
if (!default_conn) {
printk("Set Tx power level to %d\n", txpower[idx]);
set_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_ADV,
0, txpower[idx]);
k_sleep(K_SECONDS(5));
printk("Get Tx power level -> ");
get_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_ADV,
0, &txp_get);
printk("TXP = %d\n", txp_get);
idx = (idx+1) % DEVICE_BEACON_TXPOWER_NUM;
} else {
int8_t rssi = 0xFF;
int8_t txp_adaptive;
idx = 0;
read_conn_rssi(default_conn_handle, &rssi);
printk("Connected (%d) - RSSI = %d\n",
default_conn_handle, rssi);
if (rssi > -70) {
txp_adaptive = -20;
} else if (rssi > -90) {
txp_adaptive = -12;
} else {
txp_adaptive = -4;
}
printk("Adaptive Tx power selected = %d\n",
txp_adaptive);
set_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_CONN,
default_conn_handle, txp_adaptive);
get_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_CONN,
default_conn_handle, &txp_get);
printk("Connection (%d) TXP = %d\n",
default_conn_handle, txp_get);
k_sleep(K_SECONDS(1));
}
}
}
int main(void)
{
int8_t txp_get = 0xFF;
int err;
default_conn = NULL;
printk("Starting Dynamic Tx Power Beacon Demo\n");
/* Initialize the Bluetooth Subsystem */
err = bt_enable(bt_ready);
if (err) {
printk("Bluetooth init failed (err %d)\n", err);
}
err = bt_nus_init(&nus_cb);
if (err) {
printk("Failed to initialize NUS (err %d)\n", err);
return err;
}
printk("Get Tx power level ->");
get_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_ADV, 0, &txp_get);
printk("-> default TXP = %d\n", txp_get);
/* Wait for 5 seconds to give a chance users/testers
* to check that default Tx power is indeed the one
* selected in Kconfig.
*/
k_sleep(K_SECONDS(5));
k_thread_create(&pwr_thread_data, pwr_thread_stack,
K_THREAD_STACK_SIZEOF(pwr_thread_stack),
modulate_tx_power, NULL, NULL, NULL,
K_PRIO_COOP(10),
0, K_NO_WAIT);
k_thread_name_set(&pwr_thread_data, "DYN TX");
while (1) {
// hrs_notify();
nus_notify();
k_sleep(K_SECONDS(1));
}
return 0;
}
My RX code：
/*
* Copyright (c) 2018 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
*/
/** @file
* @brief Nordic UART Service Client sample
*/
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/sys/printk.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/hci.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/uuid.h>
#include <zephyr/bluetooth/gatt.h>
#include <bluetooth/services/nus.h>
#include <bluetooth/services/nus_client.h>
#include <bluetooth/gatt_dm.h>
#include <bluetooth/scan.h>
#include <zephyr/settings/settings.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/logging/log.h>
#include <zephyr/bluetooth/hci.h>
#define LOG_MODULE_NAME central_uart
LOG_MODULE_REGISTER(LOG_MODULE_NAME);
/* UART payload buffer element size. */
#define UART_BUF_SIZE 45
#define KEY_PASSKEY_ACCEPT DK_BTN1_MSK
#define KEY_PASSKEY_REJECT DK_BTN2_MSK
#define NUS_WRITE_TIMEOUT K_MSEC(150)
#define UART_WAIT_FOR_BUF_DELAY K_MSEC(50)
#define UART_RX_TIMEOUT 50000 /* Wait for RX complete event time in microseconds. */
static const struct device *uart = DEVICE_DT_GET(DT_CHOSEN(nordic_nus_uart));
static struct k_work_delayable uart_work;
K_SEM_DEFINE(nus_write_sem, 0, 1);
struct uart_data_t {
void *fifo_reserved;
uint8_t data[UART_BUF_SIZE];
uint16_t len;
};
static K_FIFO_DEFINE(fifo_uart_tx_data);
static K_FIFO_DEFINE(fifo_uart_rx_data);
static struct bt_conn *default_conn;
static struct bt_nus_client nus_client;
static char last_received_data[UART_BUF_SIZE] = {0};
static uint16_t last_received_data_len = 0;
static struct k_work_delayable rssi_work;
// static void rssi_work_handler(struct k_work *work)
// {
// struct bt_conn_info info;
// struct net_buf *buf = NULL, *rsp = NULL;
// struct bt_hci_cp_read_rssi *cp;
// struct bt_hci_rp_read_rssi *rp;
// int err;
// if (default_conn) {
// struct bt_conn_info info;
// int err;
// // 获取当前连接信息
// err = bt_conn_get_info(default_conn, &info);
// if (err) {
// LOG_ERR("Failed to get connection info (err %d)", err);
// return;
// }
// // 创建HCI命令缓冲区以读取RSSI
// struct net_buf *buf = bt_hci_cmd_create(BT_HCI_OP_READ_RSSI, sizeof(uint16_t));
// if (!buf) {
// LOG_ERR("Failed to create HCI command buffer");
// return;
// }
// // 填充HCI命令
// struct bt_hci_cp_read_rssi *cp = net_buf_add(buf, sizeof(*cp));
// cp->handle = sys_cpu_to_le16(info.id);
// // 发送命令并解析响应
// struct net_buf *rsp;
// err = bt_hci_cmd_send_sync(BT_HCI_OP_READ_RSSI, buf, &rsp);
// if (err) {
// LOG_ERR("Failed to read RSSI (err %d)", err);
// return;
// }
// struct bt_hci_rp_read_rssi *rp = (void *)rsp->data;
// LOG_INF("RSSI: %d dBm", rp->rssi);
// LOG_INF("Data received: %.*s", last_received_data_len, last_received_data);
// net_buf_unref(rsp);
// }
// // 调度下一次任务
// k_work_reschedule(&rssi_work, K_SECONDS(1)); // 每秒读取一次RSSI
// }
static void rssi_work_handler(struct k_work *work)
{
struct bt_conn_info info;
struct net_buf *buf = NULL, *rsp = NULL;
struct bt_hci_cp_read_rssi *cp;
struct bt_hci_rp_read_rssi *rp;
int err;
if (!default_conn) {
LOG_ERR("No default connection available");
goto schedule;
}
/* 获取当前连接信息 */
err = bt_conn_get_info(default_conn, &info);
if (err) {
LOG_ERR("Failed to get connection info (err %d)", err);
goto schedule;
}
/* 创建 HCI 命令缓冲区以读取 RSSI */
buf = bt_hci_cmd_create(BT_HCI_OP_READ_RSSI, sizeof(*cp));
if (!buf) {
LOG_ERR("Unable to allocate HCI command buffer");
goto schedule;
}
/* 填充 HCI 命令数据（使用连接标识 info.id 作为句柄） */
cp = net_buf_add(buf, sizeof(*cp));
cp->handle = sys_cpu_to_le16(info.id);
/* 发送 HCI 命令并等待同步响应 */
err = bt_hci_cmd_send_sync(BT_HCI_OP_READ_RSSI, buf, &rsp);
if (err) {
LOG_ERR("Read RSSI error: %d", err);
goto schedule;
}
/* 解析并打印 RSSI 数据 */
rp = (void *)rsp->data;
LOG_INF("RSSI: %d dBm", rp->rssi);
LOG_INF("Data received: %.*s", last_received_data_len, last_received_data);
net_buf_unref(rsp);
schedule:
/* 调度下一次任务：每秒读取一次 RSSI */
k_work_reschedule(&rssi_work, K_SECONDS(1));
}
static void ble_data_sent(struct bt_nus_client *nus, uint8_t err,
const uint8_t *const data, uint16_t len)
{
ARG_UNUSED(nus);
ARG_UNUSED(data);
ARG_UNUSED(len);
k_sem_give(&nus_write_sem);
if (err) {
LOG_WRN("ATT error code: 0x%02X", err);
}
}
// static uint8_t ble_data_received(struct bt_nus_client *nus,
// const uint8_t *data, uint16_t len)
// {
// ARG_UNUSED(nus);
// int err;
// for (uint16_t pos = 0; pos != len;) {
// struct uart_data_t *tx = k_malloc(sizeof(*tx));
// if (!tx) {
// LOG_WRN("Not able to allocate UART send data buffer");
// return BT_GATT_ITER_CONTINUE;
// }
// /* Keep the last byte of TX buffer for potential LF char. */
// size_t tx_data_size = sizeof(tx->data) - 1;
// if ((len - pos) > tx_data_size) {
// tx->len = tx_data_size;
// } else {
// tx->len = (len - pos);
// }
// memcpy(tx->data, &data[pos], tx->len);
// pos += tx->len;
// /* Append the LF character when the CR character triggered
// * transmission from the peer.
// */
// if ((pos == len) && (data[len - 1] == '\r')) {
// tx->data[tx->len] = '\n';
// tx->len++;
// }
// err = uart_tx(uart, tx->data, tx->len, SYS_FOREVER_MS);
// if (err) {
// k_fifo_put(&fifo_uart_tx_data, tx);
// }
// }
// return BT_GATT_ITER_CONTINUE;
// }
static uint8_t ble_data_received(struct bt_nus_client *nus,
const uint8_t *data, uint16_t len)
{
ARG_UNUSED(nus);
// 保存接收到的数据
memset(last_received_data, 0, sizeof(last_received_data));
last_received_data_len = len < UART_BUF_SIZE ? len : UART_BUF_SIZE - 1;
memcpy(last_received_data, data, last_received_data_len);
//LOG_INF("Data received: %.*s", last_received_data_len, last_received_data);
return BT_GATT_ITER_CONTINUE;
}
static void uart_cb(const struct device *dev, struct uart_event *evt, void *user_data)
{
ARG_UNUSED(dev);
static size_t aborted_len;
struct uart_data_t *buf;
static uint8_t *aborted_buf;
static bool disable_req;
switch (evt->type) {
case UART_TX_DONE:
LOG_DBG("UART_TX_DONE");
if ((evt->data.tx.len == 0) ||
(!evt->data.tx.buf)) {
return;
}
if (aborted_buf) {
buf = CONTAINER_OF(aborted_buf, struct uart_data_t,
data[0]);
aborted_buf = NULL;
aborted_len = 0;
} else {
buf = CONTAINER_OF(evt->data.tx.buf,
struct uart_data_t,
data[0]);
}
k_free(buf);
buf = k_fifo_get(&fifo_uart_tx_data, K_NO_WAIT);
if (!buf) {
return;
}
if (uart_tx(uart, buf->data, buf->len, SYS_FOREVER_MS)) {
LOG_WRN("Failed to send data over UART");
}
break;
case UART_RX_RDY:
LOG_DBG("UART_RX_RDY");
buf = CONTAINER_OF(evt->data.rx.buf, struct uart_data_t, data[0]);
buf->len += evt->data.rx.len;
if (disable_req) {
return;
}
if ((evt->data.rx.buf[buf->len - 1] == '\n') ||
(evt->data.rx.buf[buf->len - 1] == '\r')) {
disable_req = true;
uart_rx_disable(uart);
}
break;
case UART_RX_DISABLED:
LOG_DBG("UART_RX_DISABLED");
disable_req = false;
buf = k_malloc(sizeof(*buf));
if (buf) {
buf->len = 0;
} else {
LOG_WRN("Not able to allocate UART receive buffer");
k_work_reschedule(&uart_work, UART_WAIT_FOR_BUF_DELAY);
return;
}
uart_rx_enable(uart, buf->data, sizeof(buf->data),
UART_RX_TIMEOUT);
break;
case UART_RX_BUF_REQUEST:
LOG_DBG("UART_RX_BUF_REQUEST");
buf = k_malloc(sizeof(*buf));
if (buf) {
buf->len = 0;
uart_rx_buf_rsp(uart, buf->data, sizeof(buf->data));
} else {
LOG_WRN("Not able to allocate UART receive buffer");
}
break;
case UART_RX_BUF_RELEASED:
LOG_DBG("UART_RX_BUF_RELEASED");
buf = CONTAINER_OF(evt->data.rx_buf.buf, struct uart_data_t,
data[0]);
if (buf->len > 0) {
k_fifo_put(&fifo_uart_rx_data, buf);
} else {
k_free(buf);
}
break;
case UART_TX_ABORTED:
LOG_DBG("UART_TX_ABORTED");
if (!aborted_buf) {
aborted_buf = (uint8_t *)evt->data.tx.buf;
}
aborted_len += evt->data.tx.len;
buf = CONTAINER_OF(aborted_buf, struct uart_data_t,
data[0]);
uart_tx(uart, &buf->data[aborted_len],
buf->len - aborted_len, SYS_FOREVER_MS);
break;
default:
break;
}
}
static void uart_work_handler(struct k_work *item)
{
struct uart_data_t *buf;
buf = k_malloc(sizeof(*buf));
if (buf) {
buf->len = 0;
} else {
LOG_WRN("Not able to allocate UART receive buffer");
k_work_reschedule(&uart_work, UART_WAIT_FOR_BUF_DELAY);
return;
}
uart_rx_enable(uart, buf->data, sizeof(buf->data), UART_RX_TIMEOUT);
}
static int uart_init(void)
{
int err;
struct uart_data_t *rx;
if (!device_is_ready(uart)) {
LOG_ERR("UART device not ready");
return -ENODEV;
}
rx = k_malloc(sizeof(*rx));
if (rx) {
rx->len = 0;
} else {
return -ENOMEM;
}
k_work_init_delayable(&uart_work, uart_work_handler);
err = uart_callback_set(uart, uart_cb, NULL);
if (err) {
return err;
}
return uart_rx_enable(uart, rx->data, sizeof(rx->data),
UART_RX_TIMEOUT);
}
static void discovery_complete(struct bt_gatt_dm *dm,
void *context)
{
struct bt_nus_client *nus = context;
LOG_INF("Service discovery completed");
bt_gatt_dm_data_print(dm);
bt_nus_handles_assign(dm, nus);
bt_nus_subscribe_receive(nus);
bt_gatt_dm_data_release(dm);
}
static void discovery_service_not_found(struct bt_conn *conn,
void *context)
{
LOG_INF("Service not found");
}
static void discovery_error(struct bt_conn *conn,
int err,
void *context)
{
LOG_WRN("Error while discovering GATT database: (%d)", err);
}
struct bt_gatt_dm_cb discovery_cb = {
.completed = discovery_complete,
.service_not_found = discovery_service_not_found,
.error_found = discovery_error,
};
static void gatt_discover(struct bt_conn *conn)
{
int err;
if (conn != default_conn) {
return;
}
err = bt_gatt_dm_start(conn,
BT_UUID_NUS_SERVICE,
&discovery_cb,
&nus_client);
if (err) {
LOG_ERR("could not start the discovery procedure, error "
"code: %d", err);
}
}
static void exchange_func(struct bt_conn *conn, uint8_t err, struct bt_gatt_exchange_params *params)
{
if (!err) {
LOG_INF("MTU exchange done");
} else {
LOG_WRN("MTU exchange failed (err %" PRIu8 ")", err);
}
}
static void connected(struct bt_conn *conn, uint8_t conn_err)
{
char addr[BT_ADDR_LE_STR_LEN];
int err;
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
if (conn_err) {
LOG_INF("Failed to connect to %s, 0x%02x %s", addr, conn_err,
bt_hci_err_to_str(conn_err));
if (default_conn == conn) {
bt_conn_unref(default_conn);
default_conn = NULL;
err = bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE);
if (err) {
LOG_ERR("Scanning failed to start (err %d)",
err);
}
}
return;
}
LOG_INF("Connected: %s", addr);
static struct bt_gatt_exchange_params exchange_params;
exchange_params.func = exchange_func;
err = bt_gatt_exchange_mtu(conn, &exchange_params);
if (err) {
LOG_WRN("MTU exchange failed (err %d)", err);
}
err = bt_conn_set_security(conn, BT_SECURITY_L2);
if (err) {
LOG_WRN("Failed to set security: %d", err);
gatt_discover(conn);
}
err = bt_scan_stop();
if ((!err) && (err != -EALREADY)) {
LOG_ERR("Stop LE scan failed (err %d)", err);
}
// 启动任务
k_work_schedule(&rssi_work, K_NO_WAIT);
}
static void disconnected(struct bt_conn *conn, uint8_t reason)
{
k_work_cancel_delayable(&rssi_work); // 取消RSSI任务
char addr[BT_ADDR_LE_STR_LEN];
int err;
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
LOG_INF("Disconnected: %s, reason 0x%02x %s", addr, reason, bt_hci_err_to_str(reason));
if (default_conn != conn) {
return;
}
bt_conn_unref(default_conn);
default_conn = NULL;
err = bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE);
if (err) {
LOG_ERR("Scanning failed to start (err %d)",
err);
}
}
static void security_changed(struct bt_conn *conn, bt_security_t level,
enum bt_security_err err)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
if (!err) {
LOG_INF("Security changed: %s level %u", addr, level);
} else {
LOG_WRN("Security failed: %s level %u err %d %s", addr, level, err,
bt_security_err_to_str(err));
}
gatt_discover(conn);
}
BT_CONN_CB_DEFINE(conn_callbacks) = {
.connected = connected,
.disconnected = disconnected,
.security_changed = security_changed
};
static void scan_filter_match(struct bt_scan_device_info *device_info,
struct bt_scan_filter_match *filter_match,
bool connectable)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(device_info->recv_info->addr, addr, sizeof(addr));
LOG_INF("Filters matched. Address: %s connectable: %d",
addr, connectable);
}
static void scan_connecting_error(struct bt_scan_device_info *device_info)
{
LOG_WRN("Connecting failed");
}
static void scan_connecting(struct bt_scan_device_info *device_info,
struct bt_conn *conn)
{
default_conn = bt_conn_ref(conn);
}
static int nus_client_init(void)
{
int err;
struct bt_nus_client_init_param init = {
.cb = {
.received = ble_data_received,
.sent = ble_data_sent,
}
};
err = bt_nus_client_init(&nus_client, &init);
if (err) {
LOG_ERR("NUS Client initialization failed (err %d)", err);
return err;
}
LOG_INF("NUS Client module initialized");
return err;
}
BT_SCAN_CB_INIT(scan_cb, scan_filter_match, NULL,
scan_connecting_error, scan_connecting);
static int scan_init(void)
{
int err;
struct bt_scan_init_param scan_init = {
.connect_if_match = 1,
};
bt_scan_init(&scan_init);
bt_scan_cb_register(&scan_cb);
err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_UUID, BT_UUID_NUS_SERVICE);
if (err) {
LOG_ERR("Scanning filters cannot be set (err %d)", err);
return err;
}
err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_NAME, "Dynamic test beacon"); // 替换为目标设备的名称
if (err) {
LOG_ERR("Failed to set name filter (err %d)", err);
return err;
}
err = bt_scan_filter_enable(BT_SCAN_UUID_FILTER|BT_SCAN_NAME_FILTER, false);
if (err) {
LOG_ERR("Filters cannot be turned on (err %d)", err);
return err;
}
LOG_INF("Scan module initialized");
return err;
}
static void auth_cancel(struct bt_conn *conn)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
LOG_INF("Pairing cancelled: %s", addr);
}
static void pairing_complete(struct bt_conn *conn, bool bonded)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
LOG_INF("Pairing completed: %s, bonded: %d", addr, bonded);
}
static void pairing_failed(struct bt_conn *conn, enum bt_security_err reason)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
LOG_WRN("Pairing failed conn: %s, reason %d %s", addr, reason,
bt_security_err_to_str(reason));
}
static struct bt_conn_auth_cb conn_auth_callbacks = {
.cancel = auth_cancel,
};
static struct bt_conn_auth_info_cb conn_auth_info_callbacks = {
.pairing_complete = pairing_complete,
.pairing_failed = pairing_failed
};
int main(void)
{
int err;
k_work_init_delayable(&rssi_work, rssi_work_handler);
err = bt_conn_auth_cb_register(&conn_auth_callbacks);
if (err) {
LOG_ERR("Failed to register authorization callbacks.");
return 0;
}
err = bt_conn_auth_info_cb_register(&conn_auth_info_callbacks);
if (err) {
printk("Failed to register authorization info callbacks.\n");
return 0;
}
err = bt_enable(NULL);
if (err) {
LOG_ERR("Bluetooth init failed (err %d)", err);
return 0;
}
LOG_INF("Bluetooth initialized");
if (IS_ENABLED(CONFIG_SETTINGS)) {
settings_load();
}
err = uart_init();
if (err != 0) {
LOG_ERR("uart_init failed (err %d)", err);
return 0;
}
err = scan_init();
if (err != 0) {
LOG_ERR("scan_init failed (err %d)", err);
return 0;
}
err = nus_client_init();
if (err != 0) {
LOG_ERR("nus_client_init failed (err %d)", err);
return 0;
}
printk("Starting Bluetooth Central UART example\n");
err = bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE);
if (err) {
LOG_ERR("Scanning failed to start (err %d)", err);
return 0;
}
LOG_INF("Scanning successfully started");
struct uart_data_t nus_data = {
.len = 0,
};
for (;;) {
/* Wait indefinitely for data to be sent over Bluetooth */
struct uart_data_t *buf = k_fifo_get(&fifo_uart_rx_data,
K_FOREVER);
int plen = MIN(sizeof(nus_data.data) - nus_data.len, buf->len);
int loc = 0;
while (plen > 0) {
memcpy(&nus_data.data[nus_data.len], &buf->data[loc], plen);
nus_data.len += plen;
loc += plen;
if (nus_data.len >= sizeof(nus_data.data) ||
(nus_data.data[nus_data.len - 1] == '\n') ||
(nus_data.data[nus_data.len - 1] == '\r')) {
err = bt_nus_client_send(&nus_client, nus_data.data, nus_data.len);
if (err) {
LOG_WRN("Failed to send data over BLE connection"
"(err %d)", err);
}
err = k_sem_take(&nus_write_sem, NUS_WRITE_TIMEOUT);
if (err) {
LOG_WRN("NUS send timeout");
}
nus_data.len = 0;
}
plen = MIN(sizeof(nus_data.data), buf->len - loc);
}
k_free(buf);
}
}
Thank you so much for your time!
