software copyright
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jiahong
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/*
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* 自然写互动课堂教学管理网关软件 V1.0
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* mqtt_client.c - MQTT通信客户端（TLS加密）
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*
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* 功能说明：
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* 1. MQTT 3.1.1协议实现（基于mosquitto库）
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* 2. TLS/SSL加密通信
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* 3. 自动重连与会话恢复
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* 4. 主题订阅管理（控制指令下发）
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* 5. 笔迹数据批量发布
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* 6. 遗嘱消息（设备离线通知）
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <syslog.h>
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#include <errno.h>
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#include <time.h>
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/* Mosquitto MQTT库 */
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#include <mosquitto.h>
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/* 模块头文件 */
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#include "mqtt_client.h"
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#include "gateway_config.h"
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/* ========== 常量定义 ========== */
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/* MQTT QoS级别 */
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#define MQTT_QOS_AT_MOST_ONCE 0
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#define MQTT_QOS_AT_LEAST_ONCE 1
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/* MQTT保活间隔（秒） */
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#define MQTT_KEEPALIVE_SEC 60
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/* 重连间隔（秒） */
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#define MQTT_RECONNECT_SEC 5
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/* 最大重连间隔（秒，指数退避上限） */
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#define MQTT_MAX_RECONNECT_SEC 120
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/* 消息批量发布缓冲区大小 */
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#define PUBLISH_BATCH_SIZE 32
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/* 主题前缀 */
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#define TOPIC_PREFIX "writech/gateway/"
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/* ========== 数据结构 ========== */
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/* MQTT客户端状态 */
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typedef struct {
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struct mosquitto *mosq; /* Mosquitto实例 */
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char gateway_id[64]; /* 网关唯一ID */
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char broker_host[256]; /* 服务器地址 */
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int broker_port; /* 服务器端口 */
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int is_connected; /* 是否已连接 */
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int reconnect_count; /* 重连次数 */
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pthread_mutex_t pub_mutex; /* 发布锁 */
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/* 主题 */
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char topic_stroke_data[128]; /* 笔迹数据上报主题 */
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char topic_device_status[128]; /* 设备状态上报主题 */
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char topic_cmd_subscribe[128]; /* 命令下发订阅主题 */
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char topic_ota[128]; /* OTA升级通知主题 */
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/* TLS证书路径 */
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char ca_cert_path[256]; /* CA证书 */
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char client_cert_path[256]; /* 客户端证书 */
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char client_key_path[256]; /* 客户端私钥 */
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/* 统计 */
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unsigned long msgs_published;
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unsigned long msgs_received;
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unsigned long bytes_sent;
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} MQTTState;
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static MQTTState g_mqtt;
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/* 命令回调函数 */
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static void (*g_cmd_callback)(const char *topic, const uint8_t *payload,
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int payload_len) = NULL;
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/* ========== MQTT回调函数 ========== */
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/**
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* 连接成功回调
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*/
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static void on_connect(struct mosquitto *mosq, void *userdata, int rc) {
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(void)userdata;
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if (rc == 0) {
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g_mqtt.is_connected = 1;
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g_mqtt.reconnect_count = 0;
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syslog(LOG_INFO, "MQTT: 已连接到 %s:%d", g_mqtt.broker_host, g_mqtt.broker_port);
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/* 订阅控制指令主题 */
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mosquitto_subscribe(mosq, NULL, g_mqtt.topic_cmd_subscribe, MQTT_QOS_AT_LEAST_ONCE);
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/* 订阅OTA升级通知主题 */
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mosquitto_subscribe(mosq, NULL, g_mqtt.topic_ota, MQTT_QOS_AT_LEAST_ONCE);
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/* 发布上线状态 */
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publish_status("online");
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} else {
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syslog(LOG_ERR, "MQTT: 连接失败，返回码=%d", rc);
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g_mqtt.is_connected = 0;
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}
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}
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/**
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* 连接断开回调
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*/
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static void on_disconnect(struct mosquitto *mosq, void *userdata, int rc) {
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(void)mosq;
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(void)userdata;
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g_mqtt.is_connected = 0;
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syslog(LOG_WARNING, "MQTT: 连接断开，原因=%d", rc);
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/* 非主动断开，将自动重连 */
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if (rc != 0) {
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g_mqtt.reconnect_count++;
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}
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}
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/**
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* 消息接收回调（订阅的主题收到消息）
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*/
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static void on_message(struct mosquitto *mosq, void *userdata,
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const struct mosquitto_message *msg) {
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(void)mosq;
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(void)userdata;
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g_mqtt.msgs_received++;
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syslog(LOG_DEBUG, "MQTT: 收到消息 [%s] 长度=%d", msg->topic, msg->payloadlen);
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/* 分发到命令处理回调 */
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if (g_cmd_callback) {
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g_cmd_callback(msg->topic, (const uint8_t *)msg->payload, msg->payloadlen);
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}
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}
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/**
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* 发布完成回调
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*/
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static void on_publish(struct mosquitto *mosq, void *userdata, int mid) {
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(void)mosq;
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(void)userdata;
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(void)mid;
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g_mqtt.msgs_published++;
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}
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/* ========== 初始化 ========== */
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/**
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* 初始化MQTT客户端
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*
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* @param host MQTT服务器地址
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* @param port MQTT服务器端口（8883=TLS）
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* @return 0成功, -1失败
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*/
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int mqtt_client_init(const char *host, int port) {
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memset(&g_mqtt, 0, sizeof(g_mqtt));
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pthread_mutex_init(&g_mqtt.pub_mutex, NULL);
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strncpy(g_mqtt.broker_host, host, sizeof(g_mqtt.broker_host) - 1);
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g_mqtt.broker_port = port;
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/* 生成网关ID */
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snprintf(g_mqtt.gateway_id, sizeof(g_mqtt.gateway_id),
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"writech-gw-%08x", (unsigned int)time(NULL));
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/* 构建主题 */
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snprintf(g_mqtt.topic_stroke_data, sizeof(g_mqtt.topic_stroke_data),
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"%s%s/stroke", TOPIC_PREFIX, g_mqtt.gateway_id);
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snprintf(g_mqtt.topic_device_status, sizeof(g_mqtt.topic_device_status),
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"%s%s/status", TOPIC_PREFIX, g_mqtt.gateway_id);
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snprintf(g_mqtt.topic_cmd_subscribe, sizeof(g_mqtt.topic_cmd_subscribe),
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"%s%s/cmd/#", TOPIC_PREFIX, g_mqtt.gateway_id);
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snprintf(g_mqtt.topic_ota, sizeof(g_mqtt.topic_ota),
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"%s%s/ota", TOPIC_PREFIX, g_mqtt.gateway_id);
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/* 初始化Mosquitto库 */
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mosquitto_lib_init();
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/* 创建Mosquitto客户端实例 */
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g_mqtt.mosq = mosquitto_new(g_mqtt.gateway_id, true, NULL);
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if (g_mqtt.mosq == NULL) {
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syslog(LOG_ERR, "MQTT: 创建客户端失败");
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return -1;
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}
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/* 注册回调 */
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mosquitto_connect_callback_set(g_mqtt.mosq, on_connect);
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mosquitto_disconnect_callback_set(g_mqtt.mosq, on_disconnect);
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mosquitto_message_callback_set(g_mqtt.mosq, on_message);
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mosquitto_publish_callback_set(g_mqtt.mosq, on_publish);
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/* 设置遗嘱消息（设备异常离线时自动发布） */
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char will_payload[128];
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snprintf(will_payload, sizeof(will_payload),
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"{\"gatewayId\":\"%s\",\"status\":\"offline\"}", g_mqtt.gateway_id);
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mosquitto_will_set(g_mqtt.mosq, g_mqtt.topic_device_status,
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strlen(will_payload), will_payload, MQTT_QOS_AT_LEAST_ONCE, true);
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/* 配置TLS */
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const char *ca_cert = gateway_config_get_string("mqtt.ca_cert", "/etc/writech/ca.pem");
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const char *client_cert = gateway_config_get_string("mqtt.client_cert", "/etc/writech/client.pem");
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const char *client_key = gateway_config_get_string("mqtt.client_key", "/etc/writech/client.key");
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strncpy(g_mqtt.ca_cert_path, ca_cert, sizeof(g_mqtt.ca_cert_path) - 1);
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strncpy(g_mqtt.client_cert_path, client_cert, sizeof(g_mqtt.client_cert_path) - 1);
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strncpy(g_mqtt.client_key_path, client_key, sizeof(g_mqtt.client_key_path) - 1);
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int tls_ret = mosquitto_tls_set(g_mqtt.mosq, ca_cert, NULL,
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client_cert, client_key, NULL);
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if (tls_ret != MOSQ_ERR_SUCCESS) {
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syslog(LOG_WARNING, "MQTT: TLS配置失败，将使用非加密连接");
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}
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/* 设置自动重连 */
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mosquitto_reconnect_delay_set(g_mqtt.mosq, MQTT_RECONNECT_SEC,
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MQTT_MAX_RECONNECT_SEC, true);
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/* 发起连接 */
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int ret = mosquitto_connect_async(g_mqtt.mosq, host, port, MQTT_KEEPALIVE_SEC);
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if (ret != MOSQ_ERR_SUCCESS) {
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syslog(LOG_ERR, "MQTT: 连接发起失败: %s", mosquitto_strerror(ret));
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return -1;
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}
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/* 启动Mosquitto网络循环线程 */
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mosquitto_loop_start(g_mqtt.mosq);
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syslog(LOG_INFO, "MQTT客户端初始化完成，网关ID=%s", g_mqtt.gateway_id);
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return 0;
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}
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/* ========== 数据发布 ========== */
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/**
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* 发布笔迹数据到MQTT
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*
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* @param pen_mac 笔MAC地址
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* @param data 笔迹二进制数据
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* @param data_len 数据长度
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* @return 0成功, -1未连接, -2发布失败
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*/
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int mqtt_publish_stroke(const char *pen_mac, const uint8_t *data, int data_len) {
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if (!g_mqtt.is_connected) {
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return -1;
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}
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/* 构建包含笔MAC的完整主题 */
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char topic[256];
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snprintf(topic, sizeof(topic), "%s/%s", g_mqtt.topic_stroke_data, pen_mac);
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pthread_mutex_lock(&g_mqtt.pub_mutex);
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int ret = mosquitto_publish(g_mqtt.mosq, NULL, topic,
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data_len, data, MQTT_QOS_AT_MOST_ONCE, false);
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pthread_mutex_unlock(&g_mqtt.pub_mutex);
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if (ret == MOSQ_ERR_SUCCESS) {
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g_mqtt.bytes_sent += data_len;
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return 0;
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}
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syslog(LOG_WARNING, "MQTT: 发布失败: %s", mosquitto_strerror(ret));
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return -2;
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}
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/**
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* 发布网关/设备状态
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*/
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static void publish_status(const char *status) {
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char payload[512];
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snprintf(payload, sizeof(payload),
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"{\"gatewayId\":\"%s\",\"status\":\"%s\","
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"\"uptime\":%lu,\"penCount\":%d,"
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"\"msgsSent\":%lu,\"msgsRecv\":%lu}",
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g_mqtt.gateway_id, status,
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(unsigned long)time(NULL),
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0, /* pen count to be filled */
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g_mqtt.msgs_published,
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g_mqtt.msgs_received);
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mosquitto_publish(g_mqtt.mosq, NULL, g_mqtt.topic_device_status,
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strlen(payload), payload, MQTT_QOS_AT_LEAST_ONCE, true);
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}
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/* ========== 外部接口 ========== */
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int mqtt_client_is_connected(void) { return g_mqtt.is_connected; }
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int mqtt_client_get_fd(void) {
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return mosquitto_socket(g_mqtt.mosq);
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}
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void mqtt_client_process_read(void) {
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mosquitto_loop_read(g_mqtt.mosq, 1);
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}
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void mqtt_client_process_write(void) {
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mosquitto_loop_write(g_mqtt.mosq, 1);
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}
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void mqtt_client_set_cmd_callback(void (*cb)(const char *, const uint8_t *, int)) {
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g_cmd_callback = cb;
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}
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void mqtt_client_cleanup(void) {
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if (g_mqtt.mosq) {
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publish_status("offline");
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mosquitto_disconnect(g_mqtt.mosq);
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mosquitto_loop_stop(g_mqtt.mosq, true);
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mosquitto_destroy(g_mqtt.mosq);
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}
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mosquitto_lib_cleanup();
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pthread_mutex_destroy(&g_mqtt.pub_mutex);
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syslog(LOG_INFO, "MQTT客户端已清理");
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}
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