四博 AI 智能音箱 4G S3 版本工程落地方案：三模联网、远场唤醒、打断播放与 AI 会话框架

四博 AI 智能音箱 4G S3 版本工程落地方案：三模联网、远场唤醒、打断播放与 AI 会话框架

1. 方案定位

四博 AI 智能音箱 4G S3 版本是一套基于ESP32-S3 + VB6824 + Wi-Fi/BLE/4G的 AI 语音终端方案。它不是传统意义上的蓝牙音箱，而是面向家庭、厨房、展厅、户外、门店和 B 端定制场景的联网 AI 音箱。

四博模组选型资料中，ESP32-S3 系列被定位在音视频 / AI 市场，ESPS3-32、ESPS3-32E 系列兼容官方 ESP32-S3 模组封装，适合 AI 音箱、AI 相机、多模态设备等产品开发。 四博 AI 方案资料中也明确给出 ESP32-C2/C3/S3 + VB6824 语音方案，VB6824 可完成音频编解码、AEC、语音唤醒和唤醒词修改，让主控芯片专注通信及 UI。

本方案采用“三层解耦”架构：

1. 网络平面：Wi-Fi / BLE / 4G
2. 语音平面：VB6824 / 唤醒 / 打断 / 离线命令
3. AI 平面：WebSocket / 大模型 / TTS / OTA / 工具调用

2. 硬件组合建议

主控：ESP32-S3R8 / ESPS3-32 N16R8
语音：VB6824
联网：Wi-Fi + BLE + 4G Cat.1
音频：MIC + 功放 + 喇叭
显示：LED 灯效 / 小屏 / 点阵屏可选
存储：16MB Flash + 8MB PSRAM
电源：Type-C / 锂电池 / DC 供电
扩展：外置经典蓝牙音频芯片 / TF Card / 按键

需要特别说明：
ESP32-S3 原生支持 Wi-Fi + BLE，BLE 适合配网、绑定、小程序控制；如果要实现真正的手机蓝牙音乐播放，也就是 A2DP 经典蓝牙音频，建议增加外置蓝牙音频芯片或采用 7014 类蓝牙音频方案。四博资料中也单独列出了 7014 蓝牙 PAN AI 手机伴侣方案和 AI 智能音响方案，强调可做蓝牙音响、闹钟、声音克隆、声纹识别、APP、小程序和改唤醒词等功能。

3. 总体软件框架

这次不采用普通while(1)轮询写法，而是采用Bus + Manager + Port + Policy的工程结构。

sibo_ai_speaker_4g_s3/
├── app/
│ ├── app_main.c
│ ├── app_bus.c
│ ├── app_bus.h
│ ├── app_fsm.c
│ └── app_fsm.h
├── board/
│ ├── board_config.h
│ └── board_init.c
├── network/
│ ├── net_policy.c
│ ├── wifi_port.c
│ ├── ble_provision.c
│ └── modem_4g_port.c
├── voice/
│ ├── vb6824_port.c
│ ├── voice_cmd_map.c
│ └── wakeup_controller.c
├── audio/
│ ├── audio_route.c
│ ├── tts_player.c
│ └── prompt_player.c
├── ai/
│ ├── ai_session.c
│ ├── ai_protocol.c
│ └── ai_action.c
├── ota/
│ └── ota_service.c
└── ui/
├── speaker_ui.c
└── led_effect.c

核心思想：

驱动层只负责收发数据；
Manager 层只负责状态管理；
Policy 层只负责选择策略；
App 层只处理业务事件；
AI 层只处理协议与云端交互。

4. board_config.h

#pragma once

#include "driver/gpio.h"
#include "driver/uart.h"

#define PRODUCT_NAME "SIBO_AI_SPEAKER_4G_S3"
#define DEVICE_ID "SIBO_S3_4G_001122334455"

/* AI Server */
#define AI_WS_URI "wss://ai.example.com/sibo/speaker/ws"

/* VB6824 UART */
#define VB6824_UART UART_NUM_1
#define VB6824_TXD GPIO_NUM_17
#define VB6824_RXD GPIO_NUM_18
#define VB6824_BAUD 115200

/* 4G UART */
#define MODEM_UART UART_NUM_2
#define MODEM_TXD GPIO_NUM_40
#define MODEM_RXD GPIO_NUM_41
#define MODEM_PWR GPIO_NUM_42
#define MODEM_BAUD 115200

/* Audio */
#define I2S_BCLK GPIO_NUM_5
#define I2S_WS GPIO_NUM_6
#define I2S_DOUT GPIO_NUM_7
#define I2S_DIN GPIO_NUM_8
#define AMP_EN GPIO_NUM_9

/* Keys */
#define KEY_WAKEUP GPIO_NUM_0
#define KEY_VOL_UP GPIO_NUM_10
#define KEY_VOL_DOWN GPIO_NUM_11

/* Network Policy */
#define WIFI_SCORE 100
#define MODEM_4G_SCORE 70
#define NET_RETRY_INTERVAL_MS 3000

5. 应用事件总线

AI 音箱有大量异步事件：网络上线、4G 断线、语音唤醒、播放中打断、AI 返回、TTS 播放完成、OTA 通知。建议统一走事件总线。

#pragma once

#include <stdint.h>
#include <stddef.h>

typedef enum {
BUS_EVT_NONE = 0,

BUS_EVT_WIFI_UP,
BUS_EVT_WIFI_DOWN,
BUS_EVT_4G_UP,
BUS_EVT_4G_DOWN,
BUS_EVT_BLE_CONFIG_OK,

BUS_EVT_NET_SELECTED,
BUS_EVT_NET_LOST,

BUS_EVT_WAKEUP,
BUS_EVT_BARGE_IN,
BUS_EVT_CMD_CHAT,
BUS_EVT_CMD_STOP,
BUS_EVT_CMD_VOL_UP,
BUS_EVT_CMD_VOL_DOWN,
BUS_EVT_CMD_BT_MODE,
BUS_EVT_CMD_MUSIC,
BUS_EVT_CMD_ALARM,

BUS_EVT_AI_CONNECTED,
BUS_EVT_AI_DISCONNECTED,
BUS_EVT_AI_JSON,

BUS_EVT_TTS_START,
BUS_EVT_TTS_DONE,

BUS_EVT_OTA_NOTIFY,
BUS_EVT_OTA_START,
BUS_EVT_OTA_DONE,
BUS_EVT_OTA_FAIL,
} bus_evt_id_t;

typedef struct {
bus_evt_id_t id;
void *payload;
size_t length;
} bus_evt_t;

#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
#include "app_bus.h"

static QueueHandle_t s_bus_queue = NULL;

void app_bus_init(void)
{
s_bus_queue = xQueueCreate(32, sizeof(bus_evt_t));
}

bool app_bus_post(bus_evt_id_t id, void *payload, size_t length)
{
if (!s_bus_queue) {
return false;
}

bus_evt_t evt = {
.id = id,
.payload = payload,
.length = length,
};

return xQueueSend(s_bus_queue, &evt, pdMS_TO_TICKS(20)) == pdTRUE;
}

QueueHandle_t app_bus_queue(void)
{
return s_bus_queue;
}

6. 三模联网策略：Wi-Fi 优先，4G 兜底，BLE 配网

这版代码用“评分制”来选择网络，比简单 if/else 更适合后续扩展。

typedef enum {
NET_IF_NONE = 0,
NET_IF_WIFI,
NET_IF_4G,
} net_if_t;

typedef struct {
bool wifi_ready;
bool g4_ready;
int wifi_rssi;
int g4_csq;
net_if_t active;
} net_policy_ctx_t;

static net_policy_ctx_t s_net;

static int net_score_wifi(void)
{
if (!s_net.wifi_ready) {
return 0;
}

if (s_net.wifi_rssi > -60) {
return 100;
} else if (s_net.wifi_rssi > -75) {
return 85;
}

return 60;
}

static int net_score_4g(void)
{
if (!s_net.g4_ready) {
return 0;
}

if (s_net.g4_csq >= 20) {
return 80;
} else if (s_net.g4_csq >= 12) {
return 70;
}

return 50;
}

static void net_policy_select(void)
{
int wifi_score = net_score_wifi();
int g4_score = net_score_4g();

net_if_t next = NET_IF_NONE;

if (wifi_score >= g4_score && wifi_score > 0) {
next = NET_IF_WIFI;
} else if (g4_score > 0) {
next = NET_IF_4G;
}

if (next != s_net.active) {
s_net.active = next;

if (next == NET_IF_NONE) {
app_bus_post(BUS_EVT_NET_LOST, NULL, 0);
} else {
app_bus_post(BUS_EVT_NET_SELECTED, NULL, 0);
}
}
}

void net_policy_on_event(bus_evt_id_t evt)
{
switch (evt) {
case BUS_EVT_WIFI_UP:
s_net.wifi_ready = true;
break;

case BUS_EVT_WIFI_DOWN:
s_net.wifi_ready = false;
modem_4g_connect_async();
break;

case BUS_EVT_4G_UP:
s_net.g4_ready = true;
break;

case BUS_EVT_4G_DOWN:
s_net.g4_ready = false;
break;

case BUS_EVT_BLE_CONFIG_OK:
wifi_connect_saved_profile();
break;

default:
break;
}

net_policy_select();
}

const char *net_policy_active_name(void)
{
switch (s_net.active) {
case NET_IF_WIFI:
return "wifi";
case NET_IF_4G:
return "4g";
default:
return "none";
}
}

7. 4G 模块 AT 命令封装

#include "driver/uart.h"
#include "esp_log.h"
#include "board_config.h"

static const char *TAG = "MODEM4G";

void modem_4g_init(void)
{
uart_config_t cfg = {
.baud_rate = MODEM_BAUD,
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
.source_clk = UART_SCLK_DEFAULT,
};

uart_driver_install(MODEM_UART, 4096, 4096, 0, NULL, 0);
uart_param_config(MODEM_UART, &cfg);
uart_set_pin(MODEM_UART, MODEM_TXD, MODEM_RXD,
UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);

ESP_LOGI(TAG, "4G modem uart initialized");
}

static void modem_send_line(const char *cmd)
{
uart_write_bytes(MODEM_UART, cmd, strlen(cmd));
uart_write_bytes(MODEM_UART, "\r\n", 2);
}

void modem_4g_probe_basic(void)
{
modem_send_line("AT");
vTaskDelay(pdMS_TO_TICKS(300));

modem_send_line("ATE0");
vTaskDelay(pdMS_TO_TICKS(300));

modem_send_line("AT+CPIN?");
vTaskDelay(pdMS_TO_TICKS(300));

modem_send_line("AT+CSQ");
vTaskDelay(pdMS_TO_TICKS(300));

modem_send_line("AT+CREG?");
vTaskDelay(pdMS_TO_TICKS(300));

modem_send_line("AT+CGATT?");
vTaskDelay(pdMS_TO_TICKS(300));
}

void modem_4g_start_data_call(void)
{
modem_send_line("AT+CGDCONT=1,\"IP\",\"cmnet\"");
vTaskDelay(pdMS_TO_TICKS(500));

modem_send_line("ATD*99#");

/*
* 后续进入 PPP：
* 1. esp_modem 建立 DTE/DCE
* 2. esp_netif_attach PPP
* 3. 等待 IP_EVENT_PPP_GOT_IP
* 4. 成功后 app_bus_post(BUS_EVT_4G_UP)
*/
}

8. VB6824 串口流式解析器

上一版是简单判断buf[0] == 0xAA，真实产品建议写成流式解析器，避免串口分包、粘包导致解析失败。

协议示例：

AA 55 LEN CMD PAYLOAD... CHECKSUM

typedef enum {
PARSE_WAIT_AA = 0,
PARSE_WAIT_55,
PARSE_WAIT_LEN,
PARSE_WAIT_BODY,
PARSE_WAIT_SUM,
} vb_parse_state_t;

typedef struct {
vb_parse_state_t state;
uint8_t len;
uint8_t index;
uint8_t cmd;
uint8_t body[32];
uint8_t sum;
} vb_parser_t;

static vb_parser_t s_vb_parser;

static uint8_t vb_sum_calc(uint8_t len, uint8_t cmd, uint8_t *body)
{
uint8_t sum = 0xAA + 0x55 + len + cmd;

for (int i = 0; i < len - 1; i++) {
sum += body[i];
}

return sum;
}

static void vb_dispatch_cmd(uint8_t cmd)
{
switch (cmd) {
case 0x01:
app_bus_post(BUS_EVT_WAKEUP, NULL, 0);
break;

case 0x02:
app_bus_post(BUS_EVT_BARGE_IN, NULL, 0);
break;

case 0x03:
app_bus_post(BUS_EVT_CMD_CHAT, NULL, 0);
break;

case 0x04:
app_bus_post(BUS_EVT_CMD_STOP, NULL, 0);
break;

case 0x05:
app_bus_post(BUS_EVT_CMD_VOL_UP, NULL, 0);
break;

case 0x06:
app_bus_post(BUS_EVT_CMD_VOL_DOWN, NULL, 0);
break;

case 0x07:
app_bus_post(BUS_EVT_CMD_BT_MODE, NULL, 0);
break;

default:
break;
}
}

static void vb_parser_input(uint8_t byte)
{
switch (s_vb_parser.state) {
case PARSE_WAIT_AA:
if (byte == 0xAA) {
s_vb_parser.state = PARSE_WAIT_55;
}
break;

case PARSE_WAIT_55:
if (byte == 0x55) {
s_vb_parser.state = PARSE_WAIT_LEN;
} else {
s_vb_parser.state = PARSE_WAIT_AA;
}
break;

case PARSE_WAIT_LEN:
s_vb_parser.len = byte;
s_vb_parser.index = 0;

if (s_vb_parser.len == 1) {
s_vb_parser.state = PARSE_WAIT_SUM;
} else {
s_vb_parser.state = PARSE_WAIT_BODY;
}
break;

case PARSE_WAIT_BODY:
if (s_vb_parser.index == 0) {
s_vb_parser.cmd = byte;
} else {
s_vb_parser.body[s_vb_parser.index - 1] = byte;
}

s_vb_parser.index++;

if (s_vb_parser.index >= s_vb_parser.len) {
s_vb_parser.state = PARSE_WAIT_SUM;
}
break;

case PARSE_WAIT_SUM: {
uint8_t calc = vb_sum_calc(
s_vb_parser.len,
s_vb_parser.cmd,
s_vb_parser.body
);

if (calc == byte) {
vb_dispatch_cmd(s_vb_parser.cmd);
}

memset(&s_vb_parser, 0, sizeof(s_vb_parser));
s_vb_parser.state = PARSE_WAIT_AA;
break;
}

default:
s_vb_parser.state = PARSE_WAIT_AA;
break;
}
}

串口任务：

void vb6824_task(void *arg)
{
uint8_t buf[64];

while (1) {
int len = uart_read_bytes(VB6824_UART, buf, sizeof(buf), pdMS_TO_TICKS(100));

for (int i = 0; i < len; i++) {
vb_parser_input(buf[i]);
}
}
}

9. 音频状态机：远场唤醒 + 播放中打断

typedef enum {
AUDIO_IDLE = 0,
AUDIO_LISTENING,
AUDIO_UPLOADING,
AUDIO_PLAYING_TTS,
AUDIO_BT_MUSIC,
AUDIO_INTERRUPTED,
} audio_state_t;

static audio_state_t s_audio_state = AUDIO_IDLE;
static int s_volume = 70;

void audio_set_state(audio_state_t state)
{
s_audio_state = state;
}

void audio_barge_in(void)
{
if (s_audio_state == AUDIO_PLAYING_TTS ||
s_audio_state == AUDIO_BT_MUSIC) {
audio_player_stop();
s_audio_state = AUDIO_INTERRUPTED;
speaker_ui_status("已打断，请继续说");
}
}

void audio_volume_up(void)
{
if (s_volume < 100) {
s_volume += 5;
}
audio_player_set_volume(s_volume);
}

void audio_volume_down(void)
{
if (s_volume > 0) {
s_volume -= 5;
}
audio_player_set_volume(s_volume);
}

VB6824 的价值就在这里：它把唤醒、AEC、离线命令和抗噪能力前置到语音芯片，让 ESP32-S3 主要负责通信、状态机和 AI 协议。四博 AI 开发宝典中提到，VB6824 具备更远距离唤醒、更低误唤醒率、更强抗噪能力和更快响应识别时间。

10. AI 会话协议

设备上线：

{
"type": "hello",
"device_id": "SIBO_S3_4G_001122334455",
"product": "SIBO_AI_SPEAKER_4G_S3",
"net": "wifi",
"capability": {
"wifi": true,
"ble": true,
"g4": true,
"far_field": true,
"barge_in": true,
"wake_word": "小博小博"
}
}

用户语音请求：

{
"type": "chat",
"session_id": "session_0001",
"text": "帮我设置一个晚上八点的提醒",
"scene": "ai_speaker",
"tts": true
}

AI 返回：

{
"type": "ai_result",
"text": "好的，已为你设置晚上八点的提醒。",
"tts_url": "https://cdn.example.com/tts/001.mp3",
"action": {
"name": "set_alarm",
"params": {
"time": "20:00"
}
}
}

WebSocket 客户端：

static esp_websocket_client_handle_t s_ws;

static void ai_ws_event_handler(void *arg,
esp_event_base_t base,
int32_t event_id,
void *event_data)
{
esp_websocket_event_data_t *data = event_data;

switch (event_id) {
case WEBSOCKET_EVENT_CONNECTED:
app_bus_post(BUS_EVT_AI_CONNECTED, NULL, 0);
break;

case WEBSOCKET_EVENT_DISCONNECTED:
app_bus_post(BUS_EVT_AI_DISCONNECTED, NULL, 0);
break;

case WEBSOCKET_EVENT_DATA:
if (data->op_code == 0x1) {
char *json = calloc(1, data->data_len + 1);
if (json) {
memcpy(json, data->data_ptr, data->data_len);
app_bus_post(BUS_EVT_AI_JSON, json, data->data_len);
}
}
break;

default:
break;
}
}

void ai_session_start(void)
{
esp_websocket_client_config_t cfg = {
.uri = AI_WS_URI,
.reconnect_timeout_ms = 3000,
.network_timeout_ms = 10000,
};

s_ws = esp_websocket_client_init(&cfg);
esp_websocket_register_events(s_ws, WEBSOCKET_EVENT_ANY, ai_ws_event_handler, NULL);
esp_websocket_client_start(s_ws);
}

static void ai_send_json(cJSON *root)
{
if (!s_ws || !esp_websocket_client_is_connected(s_ws)) {
return;
}

char *text = cJSON_PrintUnformatted(root);
if (!text) {
return;
}

esp_websocket_client_send_text(s_ws, text, strlen(text), portMAX_DELAY);
cJSON_free(text);
}

11. 设备 Hello 上报

void ai_send_hello(void)
{
cJSON *root = cJSON_CreateObject();

cJSON_AddStringToObject(root, "type", "hello");
cJSON_AddStringToObject(root, "device_id", DEVICE_ID);
cJSON_AddStringToObject(root, "product", PRODUCT_NAME);
cJSON_AddStringToObject(root, "net", net_policy_active_name());

cJSON *cap = cJSON_CreateObject();
cJSON_AddBoolToObject(cap, "wifi", true);
cJSON_AddBoolToObject(cap, "ble", true);
cJSON_AddBoolToObject(cap, "g4", true);
cJSON_AddBoolToObject(cap, "far_field", true);
cJSON_AddBoolToObject(cap, "barge_in", true);
cJSON_AddStringToObject(cap, "wake_word", "小博小博");

cJSON_AddItemToObject(root, "capability", cap);

ai_send_json(root);
cJSON_Delete(root);
}

12. AI 返回解析与 Action 分发

static void ai_handle_action(cJSON *action)
{
cJSON *name = cJSON_GetObjectItem(action, "name");
cJSON *params = cJSON_GetObjectItem(action, "params");

if (!cJSON_IsString(name)) {
return;
}

if (strcmp(name->valuestring, "set_alarm") == 0) {
cJSON *time = cJSON_GetObjectItem(params, "time");
if (cJSON_IsString(time)) {
alarm_set(time->valuestring);
}
} else if (strcmp(name->valuestring, "play_music") == 0) {
cJSON *keyword = cJSON_GetObjectItem(params, "keyword");
if (cJSON_IsString(keyword)) {
music_search_and_play(keyword->valuestring);
}
} else if (strcmp(name->valuestring, "switch_bt") == 0) {
audio_route_set_bt_mode(true);
}
}

void ai_parse_json(const char *json)
{
cJSON *root = cJSON_Parse(json);
if (!root) {
return;
}

cJSON *type = cJSON_GetObjectItem(root, "type");

if (cJSON_IsString(type) && strcmp(type->valuestring, "ai_result") == 0) {
cJSON *text = cJSON_GetObjectItem(root, "text");
cJSON *tts = cJSON_GetObjectItem(root, "tts_url");
cJSON *action = cJSON_GetObjectItem(root, "action");

if (cJSON_IsString(text)) {
speaker_ui_text(text->valuestring);
}

if (cJSON_IsString(tts)) {
audio_set_state(AUDIO_PLAYING_TTS);
tts_player_play_url(tts->valuestring);
}

if (cJSON_IsObject(action)) {
ai_handle_action(action);
}
}

if (cJSON_IsString(type) && strcmp(type->valuestring, "ota_notify") == 0) {
cJSON *url = cJSON_GetObjectItem(root, "firmware_url");
if (cJSON_IsString(url)) {
char *copy = strdup(url->valuestring);
app_bus_post(BUS_EVT_OTA_NOTIFY, copy, strlen(copy));
}
}

cJSON_Delete(root);
}

13. 音频路由：AI TTS / 本地提示音 / 蓝牙音频

typedef enum {
AUDIO_ROUTE_PROMPT = 0,
AUDIO_ROUTE_AI_TTS,
AUDIO_ROUTE_BT_AUDIO,
} audio_route_t;

static audio_route_t s_route = AUDIO_ROUTE_PROMPT;

void audio_route_set(audio_route_t route)
{
s_route = route;

switch (route) {
case AUDIO_ROUTE_PROMPT:
external_bt_audio_enable(false);
amp_enable(true);
break;

case AUDIO_ROUTE_AI_TTS:
external_bt_audio_enable(false);
amp_enable(true);
break;

case AUDIO_ROUTE_BT_AUDIO:
external_bt_audio_enable(true);
amp_enable(true);
audio_set_state(AUDIO_BT_MUSIC);
break;
}
}

void audio_route_set_bt_mode(bool enable)
{
if (enable) {
audio_route_set(AUDIO_ROUTE_BT_AUDIO);
speaker_ui_status("蓝牙音箱模式");
} else {
audio_route_set(AUDIO_ROUTE_PROMPT);
speaker_ui_status("AI 音箱模式");
}
}

14. App 事件分发

static void app_handle_event(bus_evt_t *evt)
{
switch (evt->id) {
case BUS_EVT_WIFI_UP:
case BUS_EVT_WIFI_DOWN:
case BUS_EVT_4G_UP:
case BUS_EVT_4G_DOWN:
case BUS_EVT_BLE_CONFIG_OK:
net_policy_on_event(evt->id);
break;

case BUS_EVT_NET_SELECTED:
speaker_ui_status("网络已连接");
ai_session_start();
break;

case BUS_EVT_AI_CONNECTED:
speaker_ui_status("AI 服务在线");
ai_send_hello();
break;

case BUS_EVT_WAKEUP:
audio_barge_in();
audio_set_state(AUDIO_LISTENING);
prompt_player_play("/spiffs/wakeup.mp3");
speaker_ui_status("我在，请说");
break;

case BUS_EVT_BARGE_IN:
audio_barge_in();
break;

case BUS_EVT_CMD_CHAT:
speaker_ui_status("正在思考...");
ai_send_chat_text("用户发起语音对话");
break;

case BUS_EVT_CMD_STOP:
audio_player_stop();
audio_set_state(AUDIO_IDLE);
speaker_ui_status("已停止");
break;

case BUS_EVT_CMD_VOL_UP:
audio_volume_up();
break;

case BUS_EVT_CMD_VOL_DOWN:
audio_volume_down();
break;

case BUS_EVT_CMD_BT_MODE:
audio_route_set_bt_mode(true);
break;

case BUS_EVT_AI_JSON:
ai_parse_json((char *)evt->payload);
free(evt->payload);
break;

case BUS_EVT_OTA_NOTIFY:
ota_start((char *)evt->payload);
free(evt->payload);
break;

default:
break;
}
}

void app_dispatch_task(void *arg)
{
QueueHandle_t q = app_bus_queue();
bus_evt_t evt;

while (1) {
if (xQueueReceive(q, &evt, portMAX_DELAY) == pdTRUE) {
app_handle_event(&evt);
}
}
}

15. app_main.c

void app_main(void)
{
nvs_flash_init();

app_bus_init();

board_init();
speaker_ui_init();
speaker_ui_status("四博 AI 智能音箱启动中...");

audio_route_init();
wifi_port_init();
ble_provision_init();
modem_4g_init();
vb6824_port_init();
ota_service_init();

xTaskCreate(app_dispatch_task, "app_dispatch", 8192, NULL, 8, NULL);
xTaskCreate(vb6824_task, "vb6824_task", 4096, NULL, 7, NULL);

wifi_connect_saved_profile();
ble_provision_start();
modem_4g_probe_basic();

speaker_ui_status("正在连接 Wi-Fi / 4G...");
}

16. sdkconfig.defaults

CONFIG_IDF_TARGET="esp32s3"

CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y

CONFIG_SPIRAM=y
CONFIG_SPIRAM_USE_MALLOC=y
CONFIG_SPIRAM_SPEED_80M=y

CONFIG_FREERTOS_HZ=1000
CONFIG_ESP_MAIN_TASK_STACK_SIZE=8192

CONFIG_ESP_WIFI_STATIC_RX_BUFFER_NUM=10
CONFIG_ESP_WIFI_DYNAMIC_RX_BUFFER_NUM=32
CONFIG_ESP_WIFI_TX_BUFFER_TYPE_DYNAMIC=y

CONFIG_LWIP_TCP_SND_BUF_DEFAULT=8192
CONFIG_LWIP_TCP_WND_DEFAULT=8192
CONFIG_LWIP_TCP_RECVMBOX_SIZE=16

CONFIG_MBEDTLS_SSL_IN_CONTENT_LEN=16384
CONFIG_MBEDTLS_SSL_OUT_CONTENT_LEN=4096

CONFIG_BT_ENABLED=y
CONFIG_BT_NIMBLE_ENABLED=y

CONFIG_LWIP_PPP_SUPPORT=y
CONFIG_PPP_SUPPORT=y

17. 总结

四博 AI 智能音箱 4G S3 版本的关键不是“能播放声音”，而是构建一套稳定的 AI 语音终端架构：

ESP32-S3：系统主控、三模联网、AI 协议、OTA
VB6824：远场唤醒、AEC、离线命令、高噪声识别
Wi-Fi：家庭和固定场景主网络
4G：户外、门店、展厅兜底网络
BLE：小程序配网、绑定、控制
WebSocket：AI 长连接、TTS、工具调用
外置蓝牙音频芯片：扩展传统蓝牙音箱能力

这套架构适合 AI 音箱、厨房语音助手、户外便携音箱、门店讲解终端、展厅接待设备和 B 端定制语音硬件。