314 lines
12 KiB
C
314 lines
12 KiB
C
/*
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* 这个例程适用于`Linux`这类支持pthread的POSIX设备, 它演示了用SDK配置MQTT参数并建立连接, 之后创建2个线程
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*
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* + 一个线程用于保活长连接
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* + 一个线程用于接收消息, 并在有消息到达时进入默认的数据回调, 在连接状态变化时进入事件回调
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*
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* 需要用户关注或修改的部分, 已经用 TODO 在注释中标明
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*
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*/
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#include <stdio.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 "aiot_state_api.h"
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#include "aiot_sysdep_api.h"
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#include "aiot_mqtt_api.h"
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/* TODO: 替换为自己设备的三元组 */
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char *product_key = "${YourProductKey}";
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char *device_name = "${YourDeviceName}";
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char *device_secret = "${YourDeviceSecret}";
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/*
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TODO: 替换为自己实例的接入点
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对于企业实例, 或者2021年07月30日之后（含当日）开通的物联网平台服务下公共实例
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mqtt_host的格式为"${YourInstanceId}.mqtt.iothub.aliyuncs.com"
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其中${YourInstanceId}: 请替换为您企业/公共实例的Id
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对于2021年07月30日之前（不含当日）开通的物联网平台服务下公共实例
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需要将mqtt_host修改为: mqtt_host = "${YourProductKey}.iot-as-mqtt.${YourRegionId}.aliyuncs.com"
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其中, ${YourProductKey}：请替换为设备所属产品的ProductKey。可登录物联网平台控制台，在对应实例的设备详情页获取。
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${YourRegionId}：请替换为您的物联网平台设备所在地域代码, 比如cn-shanghai等
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该情况下完整mqtt_host举例: a1TTmBPIChA.iot-as-mqtt.cn-shanghai.aliyuncs.com
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详情请见: https://help.aliyun.com/document_detail/147356.html
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*/
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char *mqtt_host = "${YourInstanceId}.mqtt.iothub.aliyuncs.com";
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/* 位于portfiles/aiot_port文件夹下的系统适配函数集合 */
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extern aiot_sysdep_portfile_t g_aiot_sysdep_portfile;
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/* 位于external/ali_ca_cert.c中的服务器证书 */
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extern const char *ali_ca_cert;
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static pthread_t g_mqtt_process_thread;
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static pthread_t g_mqtt_recv_thread;
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static uint8_t g_mqtt_process_thread_running = 0;
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static uint8_t g_mqtt_recv_thread_running = 0;
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/* TODO: 如果要关闭日志, 就把这个函数实现为空, 如果要减少日志, 可根据code选择不打印
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*
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* 例如: [1577589489.033][LK-0317] {YourDeviceName}&{YourProductKey}
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*
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* 上面这条日志的code就是0317(十六进制), code值的定义见core/aiot_state_api.h
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*
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*/
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/* 日志回调函数, SDK的日志会从这里输出 */
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int32_t demo_state_logcb(int32_t code, char *message)
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{
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printf("%s", message);
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return 0;
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}
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/* MQTT事件回调函数, 当网络连接/重连/断开时被触发, 事件定义见core/aiot_mqtt_api.h */
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void demo_mqtt_event_handler(void *handle, const aiot_mqtt_event_t *event, void *userdata)
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{
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switch (event->type) {
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/* SDK因为用户调用了aiot_mqtt_connect()接口, 与mqtt服务器建立连接已成功 */
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case AIOT_MQTTEVT_CONNECT: {
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printf("AIOT_MQTTEVT_CONNECT\n");
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/* TODO: 处理SDK建连成功, 不可以在这里调用耗时较长的阻塞函数 */
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}
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break;
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/* SDK因为网络状况被动断连后, 自动发起重连已成功 */
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case AIOT_MQTTEVT_RECONNECT: {
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printf("AIOT_MQTTEVT_RECONNECT\n");
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/* TODO: 处理SDK重连成功, 不可以在这里调用耗时较长的阻塞函数 */
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}
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break;
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/* SDK因为网络的状况而被动断开了连接, network是底层读写失败, heartbeat是没有按预期得到服务端心跳应答 */
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case AIOT_MQTTEVT_DISCONNECT: {
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char *cause = (event->data.disconnect == AIOT_MQTTDISCONNEVT_NETWORK_DISCONNECT) ? ("network disconnect") :
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("heartbeat disconnect");
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printf("AIOT_MQTTEVT_DISCONNECT: %s\n", cause);
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/* TODO: 处理SDK被动断连, 不可以在这里调用耗时较长的阻塞函数 */
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}
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break;
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default: {
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}
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}
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}
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/* MQTT默认消息处理回调, 当SDK从服务器收到MQTT消息时, 且无对应用户回调处理时被调用 */
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void demo_mqtt_default_recv_handler(void *handle, const aiot_mqtt_recv_t *packet, void *userdata)
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{
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switch (packet->type) {
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case AIOT_MQTTRECV_HEARTBEAT_RESPONSE: {
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printf("heartbeat response\n");
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/* TODO: 处理服务器对心跳的回应, 一般不处理 */
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}
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break;
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case AIOT_MQTTRECV_SUB_ACK: {
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printf("suback, res: -0x%04X, packet id: %d, max qos: %d\n",
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-packet->data.sub_ack.res, packet->data.sub_ack.packet_id, packet->data.sub_ack.max_qos);
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/* TODO: 处理服务器对订阅请求的回应, 一般不处理 */
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}
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break;
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case AIOT_MQTTRECV_PUB: {
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printf("pub, qos: %d, topic: %.*s\n", packet->data.pub.qos, packet->data.pub.topic_len, packet->data.pub.topic);
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printf("pub, payload: %.*s\n", packet->data.pub.payload_len, packet->data.pub.payload);
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/* TODO: 处理服务器下发的业务报文, 此处如果收到rrpc的报文, 那么应答时使用相同的topic即可 */
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/* 更多信息请参考 https://help.aliyun.com/document_detail/90570.html */
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/* 下面是一个rrpc的应答示例 */
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/* {
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char *payload = "pong";
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char resp_topic[256];
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if(packet->data.pub.topic_len > 256) {
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break;
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}
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memset(resp_topic, 0, sizeof(resp_topic));
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memcpy(resp_topic, packet->data.pub.topic, packet->data.pub.topic_len);
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aiot_mqtt_pub(handle, resp_topic, (uint8_t *)payload, (uint32_t)strlen(payload), 0);
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} */
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}
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break;
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case AIOT_MQTTRECV_PUB_ACK: {
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printf("puback, packet id: %d\n", packet->data.pub_ack.packet_id);
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/* TODO: 处理服务器对QoS1上报消息的回应, 一般不处理 */
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}
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break;
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default: {
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}
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}
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}
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/* 执行aiot_mqtt_process的线程, 包含心跳发送和QoS1消息重发 */
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void *demo_mqtt_process_thread(void *args)
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{
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int32_t res = STATE_SUCCESS;
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while (g_mqtt_process_thread_running) {
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res = aiot_mqtt_process(args);
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if (res == STATE_USER_INPUT_EXEC_DISABLED) {
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break;
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}
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sleep(1);
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}
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return NULL;
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}
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/* 执行aiot_mqtt_recv的线程, 包含网络自动重连和从服务器收取MQTT消息 */
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void *demo_mqtt_recv_thread(void *args)
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{
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int32_t res = STATE_SUCCESS;
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while (g_mqtt_recv_thread_running) {
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res = aiot_mqtt_recv(args);
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if (res < STATE_SUCCESS) {
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if (res == STATE_USER_INPUT_EXEC_DISABLED) {
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break;
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}
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sleep(1);
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}
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}
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return NULL;
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}
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int main(int argc, char *argv[])
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{
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int32_t res = STATE_SUCCESS;
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void *mqtt_handle = NULL;
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uint16_t port = 443; /* 无论设备是否使用TLS连接阿里云平台, 目的端口都是443 */
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aiot_sysdep_network_cred_t cred; /* 安全凭据结构体, 如果要用TLS, 这个结构体中配置CA证书等参数 */
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/* 配置SDK的底层依赖 */
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aiot_sysdep_set_portfile(&g_aiot_sysdep_portfile);
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/* 配置SDK的日志输出 */
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aiot_state_set_logcb(demo_state_logcb);
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/* 创建SDK的安全凭据, 用于建立TLS连接 */
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memset(&cred, 0, sizeof(aiot_sysdep_network_cred_t));
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cred.option = AIOT_SYSDEP_NETWORK_CRED_SVRCERT_CA; /* 使用RSA证书校验MQTT服务端 */
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cred.max_tls_fragment = 16384; /* 最大的分片长度为16K, 其它可选值还有4K, 2K, 1K, 0.5K */
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cred.sni_enabled = 1; /* TLS建连时, 支持Server Name Indicator */
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cred.x509_server_cert = ali_ca_cert; /* 用来验证MQTT服务端的RSA根证书 */
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cred.x509_server_cert_len = strlen(ali_ca_cert); /* 用来验证MQTT服务端的RSA根证书长度 */
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/* 创建1个MQTT客户端实例并内部初始化默认参数 */
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mqtt_handle = aiot_mqtt_init();
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if (mqtt_handle == NULL) {
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printf("aiot_mqtt_init failed\n");
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return -1;
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}
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/* TODO: 如果以下代码不被注释, 则例程会用TCP而不是TLS连接云平台 */
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/*
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{
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memset(&cred, 0, sizeof(aiot_sysdep_network_cred_t));
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cred.option = AIOT_SYSDEP_NETWORK_CRED_NONE;
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}
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*/
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/* 配置MQTT服务器地址 */
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aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_HOST, (void *)mqtt_host);
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/* 配置MQTT服务器端口 */
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aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_PORT, (void *)&port);
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/* 配置设备productKey */
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aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_PRODUCT_KEY, (void *)product_key);
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/* 配置设备deviceName */
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aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_DEVICE_NAME, (void *)device_name);
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/* 配置设备deviceSecret */
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aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_DEVICE_SECRET, (void *)device_secret);
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/* 配置网络连接的安全凭据, 上面已经创建好了 */
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aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_NETWORK_CRED, (void *)&cred);
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/* 配置MQTT默认消息接收回调函数 */
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aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_RECV_HANDLER, (void *)demo_mqtt_default_recv_handler);
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/* 配置MQTT事件回调函数 */
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aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_EVENT_HANDLER, (void *)demo_mqtt_event_handler);
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/* 与服务器建立MQTT连接 */
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res = aiot_mqtt_connect(mqtt_handle);
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if (res < STATE_SUCCESS) {
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/* 尝试建立连接失败, 销毁MQTT实例, 回收资源 */
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aiot_mqtt_deinit(&mqtt_handle);
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printf("aiot_mqtt_connect failed: -0x%04X\n\r\n", -res);
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printf("please check variables like mqtt_host, produt_key, device_name, device_secret in demo\r\n");
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return -1;
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}
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/* MQTT 订阅topic功能示例, 请根据自己的业务需求进行使用 */
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{
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char *sub_topic = "/{YourProductKey}/{YourDeviceName}/user/get";
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res = aiot_mqtt_sub(mqtt_handle, sub_topic, NULL, 1, NULL);
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if (res < 0) {
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printf("aiot_mqtt_sub failed, res: -0x%04X\n", -res);
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return -1;
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}
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}
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/* MQTT 发布消息功能示例, 请根据自己的业务需求进行使用 */
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/* {
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char *pub_topic = "/sys/{YourProductKey}/{YourDeviceName}/thing/event/property/post";
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char *pub_payload = "{\"id\":\"1\",\"version\":\"1.0\",\"params\":{\"LightSwitch\":0}}";
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res = aiot_mqtt_pub(mqtt_handle, pub_topic, (uint8_t *)pub_payload, (uint32_t)strlen(pub_payload), 0);
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if (res < 0) {
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printf("aiot_mqtt_pub failed, res: -0x%04X\n", -res);
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return -1;
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}
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} */
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/* 创建一个单独的线程, 专用于执行aiot_mqtt_process, 它会自动发送心跳保活, 以及重发QoS1的未应答报文 */
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g_mqtt_process_thread_running = 1;
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res = pthread_create(&g_mqtt_process_thread, NULL, demo_mqtt_process_thread, mqtt_handle);
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if (res < 0) {
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printf("pthread_create demo_mqtt_process_thread failed: %d\n", res);
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return -1;
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}
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/* 创建一个单独的线程用于执行aiot_mqtt_recv, 它会循环收取服务器下发的MQTT消息, 并在断线时自动重连 */
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g_mqtt_recv_thread_running = 1;
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res = pthread_create(&g_mqtt_recv_thread, NULL, demo_mqtt_recv_thread, mqtt_handle);
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if (res < 0) {
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printf("pthread_create demo_mqtt_recv_thread failed: %d\n", res);
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return -1;
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}
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/* 主循环进入休眠 */
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while (1) {
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sleep(1);
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}
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/* 断开MQTT连接, 一般不会运行到这里 */
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g_mqtt_process_thread_running = 0;
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g_mqtt_recv_thread_running = 0;
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sleep(1);
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pthread_join(g_mqtt_process_thread, NULL);
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pthread_join(g_mqtt_recv_thread, NULL);
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res = aiot_mqtt_disconnect(mqtt_handle);
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if (res < STATE_SUCCESS) {
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aiot_mqtt_deinit(&mqtt_handle);
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printf("aiot_mqtt_disconnect failed: -0x%04X\n", -res);
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return -1;
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}
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/* 销毁MQTT实例, 一般不会运行到这里 */
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res = aiot_mqtt_deinit(&mqtt_handle);
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if (res < STATE_SUCCESS) {
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printf("aiot_mqtt_deinit failed: -0x%04X\n", -res);
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return -1;
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}
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return 0;
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}
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