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  • 图解连接阿里云(二)使用Paho-MQTT(支持FreeRTOS版本、Linux版本)连接1MQTT测试服务器 2阿里云物联网平台

    前沿提要:

    MQTT是什么不知道?

    看这一篇:https://www.cnblogs.com/happybirthdaytoyou/p/10362336.html

    阿里云官网玩不转?

    看这一篇: https://www.cnblogs.com/happybirthdaytoyou/p/14065294.html

    不会用代码连接阿里云?

    看这一篇:https://www.cnblogs.com/happybirthdaytoyou/p/14074606.html

     

    Paho-MQTT

    前往下载  https://gitee.com/mirrors/paho.mqtt.embedded-c?_from=gitee_search

    我当前使用版本:

    链接:https://pan.baidu.com/s/1pkUyD2mcQlQQur2GZHryCw
    提取码:kcpo

     

    0. 简介

    Paho嵌入式C工程提供了以下三个子项目:

    • MQTTPacket: 这里提供MQTT数据包的序列化与反序列化,以及部分辅助函数。
    •                          它们是高级库的基础,但也可以单独使用。主要取决于您对网络的读写,大概意思就是如果你对MQTT源码很熟悉,你可以直接使用MQTTPacket的接口。
    • MQTTClient:  封装MQTTPacket生成的高级别C++客户端程序。
    • MQTTClient-C:封装MQTTPacket生成的高级别C客户端程序。
    • MQTTClient-C中包含:

      ├──  CMakeLists.txt
      ├──  samples
      │   ├──  CMakeLists.txt
      │   ├──  FreeRTOS
      │   └──  linux
      ├──  src
      │   ├──  CMakeLists.txt
      │   ├──  FreeRTOS
      │   ├──  MQTTClient.c
      │   ├──  MQTTClient.h
      │   ├──  cc3200
      │   └──  linux
      └──  test
          ├──  CMakeLists.txt
          └──  test1.c
      • samples目录提供FreeRTOS和linux两个例程,分别支持FreeRTOS和Linux系统。
      • src目录提供MQTTClient的代码实现能力,以及用于移植到FreeRTOS、cc3200和Linux的网络驱动。

    代码编译方法

    mkdir mybuild
    cd mybuild
    cmake ..
    make

     

    添加两个源文件,然后修改CMakeLists.txt

     

    修改后的CMakeLists.txt:

    add_executable(
      aiot_c_demo
      aiot_c_demo.c
      aiot_mqtt_sign.c
    )
    
    target_link_libraries(aiot_c_demo paho-embed-mqtt3cc paho-embed-mqtt3c)
    target_include_directories(aiot_c_demo PRIVATE "../../src" "../../src/linux")
    target_compile_definitions(aiot_c_demo PRIVATE MQTTCLIENT_PLATFORM_HEADER=MQTTLinux.h)

     

    1. 连接MQTT测试服务器

    使用的测试服务器:

     

    aiot_c_demo.c  这是你主要编写的代码,你可以参考我下面的

    /**
    这个例子是发布消息到MQTT测试服务器 test.mosquitto.org 上去。
    我windows上的MQTT客户端软件订阅了该主题,所以可以收到这里发送的消息。
    **/
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include "MQTTClient.h"
    #include <unistd.h>
    
    
    #define ADDRESS     "test.mosquitto.org"    // MQTT Test Server For Free
    #define PORT         1883
    #define CLIENTID                          // 客户端ID
    
    const char *subTopic = "/publish/TEST/111";
    const char *pubTopic = "/publish/TEST/000";
    
    
    char clientId[150] = {0};
    char username[65]  = {0};
    char password[65]  = {0};
    
    unsigned char sendbuf[1000];
    unsigned char readbuf[1000];
    
    
    void messageArrived(MessageData* md)
    {
        MQTTMessage* message = md->message;
    
        printf("
    IOT Cloud Message Arrived! 
    ");
        printf("%.*s
    ", md->topicName->lenstring.len,  md->topicName->lenstring.data);
        printf("%.*s
    
    ", (int)message->payloadlen,     (char*)message->payload);
    }
    
    int main(int argc, char* argv[])
    {
        Network net;
        MQTTClient client;
        char *host = ADDRESS;
        short port = PORT;
    
        /* network init and establish network  */
        NetworkInit(&net);
    
        int rc = NetworkConnect(&net, host, port);
        if(!rc){
            printf("
    NetworkConnect Success 
    ");        
        }
        else{
            printf("
    NetworkConnect ERR 
    
    ");            
        }
    
        /**************MQTT Client Init***************/
        MQTTClientInit(&client, &net, 1000, sendbuf, sizeof(sendbuf), readbuf, sizeof(readbuf));
        /* set the default message handler */
        client.defaultMessageHandler = messageArrived;
    
    
        /**************MQTTConnect***************/
        /* set mqtt connect parameter */
        MQTTPacket_connectData data = MQTTPacket_connectData_initializer;       
        data.willFlag = 0;
        //data.MQTTVersion = 3; 版本号不要指定,要不然连接服务器(执行MQTTConnect时)会返回失败
        data.clientID.cstring = clientId; //clientId;
        data.username.cstring = username;
        data.password.cstring = password;
        data.keepAliveInterval = 60;
        data.cleansession = 1;
        printf("......Try to Connect to %s %d, ......
    ", host, port);
    
        rc = MQTTConnect(&client, &data);
        if(!rc)
            printf("MQTTConnect %d, Connect MQTT IoT Cloud Success!
    ", rc);
        else
            printf("MQTTConnect %d, Connect ERR!
    ", rc);
    
    
        /**************MQTTSubscribe***************/
        rc = MQTTSubscribe(&client, subTopic, 1, messageArrived);
        if(!rc)
            printf("MQTTSubscribe %d, MQTTSubscribe MQTT IoT Cloud Success!
    ", rc);
        else
            printf("MQTTSubscribe %d, MQTTSubscribe ERR!
    ", rc);
    
    
        /**************MQTTPublish***************/
        #define mqttdata "hello mqtt"
    
        MQTTMessage msg = {
            QOS1, 
            1,             //  retained .
            0,
            0,            //  id
            mqttdata,     
            strlen(mqttdata),
        };
        msg.id++;
        rc = MQTTPublish(&client, pubTopic, &msg);
        if(!rc)
            printf("MQTTPublish %d, id = %d MQTTPublish MQTT IoT Cloud Success! 
    ", rc, msg.id);
        else
            printf("MQTTPublish %d, MQTTPublish ERR!
    ", rc);
    
        while(1){
    
            MQTTYield(&client, 1000); // 在需要接收数据时, 都需要主动调用该函数
            printf("---1s--- 
     ");
    
        }
    
        return rc;
    }

    aiot_mqtt_sign.c 暂时为空文件即可, 连接阿里云时才会使用到。

     

    先填好通信猫软件上的参数

     

    注意,这里填写的发布和订阅的主题是和aiot_c_demo.c内的发布订阅的主题对应的。 MQTT,依靠主题来建立不同客户端的关联。

    PS:通信猫软件下载地址

     

       

    ubuntu内编译程序,准备运行

    运行结果:

     

    2. 连接阿里云物联网平台

    这里会使用到aiot_mqtt_sign.c

    aiot_mqtt_sign.c加上内容吧, 赋值黏贴拿去使用即可,这里面的代码可以不用关心,主要是提供一个计算密码的功能函数:

    /*
     * Copyright (C) 2015-2019 Alibaba Group Holding Limited
     */
    
    #include <stdlib.h>
    #include <stdio.h>
    #include <string.h>
    #include <stdint.h>
    
    #define PRODUCTKEY_MAXLEN           (20)
    #define DEVICENAME_MAXLEN           (32)
    #define DEVICESECRET_MAXLEN         (64)
    
    #define SIGN_SOURCE_MAXLEN          (200)
    #define CLIENTID_MAXLEN             (150)
    #define USERNAME_MAXLEN             (64)
    #define PASSWORD_MAXLEN             (65)
    
    #define TIMESTAMP_VALUE             "2524608000000"
    #define MQTT_CLINETID_KV            "|timestamp=2524608000000,_v=paho-c-1.0.0,securemode=3,signmethod=hmacsha256,lan=C|"
    
    static void utils_hmac_sha256(const uint8_t *msg, uint32_t msg_len, const uint8_t *key, uint32_t key_len, uint8_t output[32]);
    
    static void _hex2str(uint8_t *input, uint16_t input_len, char *output)
    {
        char *zEncode = "0123456789ABCDEF";
        int i = 0, j = 0;
    
        for (i = 0; i < input_len; i++) {
            output[j++] = zEncode[(input[i] >> 4) & 0xf];
            output[j++] = zEncode[(input[i]) & 0xf];
        }
    }
    
    int aiotMqttSign(const char *productKey, const char *deviceName, const char *deviceSecret, 
                         char clientId[150], char username[64], char password[65])
    {
        char deviceId[PRODUCTKEY_MAXLEN + DEVICENAME_MAXLEN + 2] = {0};
        char macSrc[SIGN_SOURCE_MAXLEN] = {0};
        uint8_t macRes[32] = {0};
        int res;
    
        /* check parameters */
        if (productKey == NULL || deviceName == NULL || deviceSecret == NULL ||
            clientId == NULL || username == NULL || password == NULL) {
            return -1;
        }
        if ((strlen(productKey) > PRODUCTKEY_MAXLEN) || (strlen(deviceName) > DEVICENAME_MAXLEN) ||
            (strlen(deviceSecret) > DEVICESECRET_MAXLEN)) {
            return -1;
        }
    
        /* setup deviceId */
        memcpy(deviceId, deviceName, strlen(deviceName));
        memcpy(deviceId + strlen(deviceId), "&", strlen("&"));
        memcpy(deviceId + strlen(deviceId), productKey, strlen(productKey));
    
        /* setup clientid */
        memcpy(clientId, deviceId, strlen(deviceId));
        memcpy(clientId + strlen(deviceId), MQTT_CLINETID_KV, strlen(MQTT_CLINETID_KV));
        memset(clientId + strlen(deviceId) + strlen(MQTT_CLINETID_KV), 0, 1);
    
        /* setup username */
        memcpy(username, deviceId, strlen(deviceId));
        memset(username + strlen(deviceId), 0, 1);
    
        /* setup password */
        memcpy(macSrc, "clientId", strlen("clientId"));
        memcpy(macSrc + strlen(macSrc), deviceId, strlen(deviceId));
        memcpy(macSrc + strlen(macSrc), "deviceName", strlen("deviceName"));
        memcpy(macSrc + strlen(macSrc), deviceName, strlen(deviceName));
        memcpy(macSrc + strlen(macSrc), "productKey", strlen("productKey"));
        memcpy(macSrc + strlen(macSrc), productKey, strlen(productKey));
        memcpy(macSrc + strlen(macSrc), "timestamp", strlen("timestamp"));
        memcpy(macSrc + strlen(macSrc), TIMESTAMP_VALUE, strlen(TIMESTAMP_VALUE));
    
        utils_hmac_sha256((uint8_t *)macSrc, strlen(macSrc), (uint8_t *)deviceSecret,
                          strlen(deviceSecret), macRes);
    
        memset(password, 0, PASSWORD_MAXLEN);
        _hex2str(macRes, sizeof(macRes), password);
        return 0;
    }
    
    /******************************
     * hmac-sha256 implement below
     ******************************/
    #define SHA256_KEY_IOPAD_SIZE   (64)
    #define SHA256_DIGEST_SIZE      (32)
    
    /**
     * rief          SHA-256 context structure
     */
    typedef struct {
        uint32_t total[2];          /*!< number of bytes processed  */
        uint32_t state[8];          /*!< intermediate digest state  */
        unsigned char buffer[64];   /*!< data block being processed */
        int is224;                  /*!< 0 => SHA-256, else SHA-224 */
    } iot_sha256_context;
    
    typedef union {
        char sptr[8];
        uint64_t lint;
    } u_retLen;
    
    /*
     * 32-bit integer manipulation macros (big endian)
     */
    #ifndef GET_UINT32_BE
    #define GET_UINT32_BE(n,b,i)                                
        do {                                                    
            (n) = ( (uint32_t) (b)[(i)    ] << 24 )             
                  | ( (uint32_t) (b)[(i) + 1] << 16 )           
                  | ( (uint32_t) (b)[(i) + 2] <<  8 )           
                  | ( (uint32_t) (b)[(i) + 3]       );          
        } while( 0 )
    #endif
    
    #ifndef PUT_UINT32_BE
    #define PUT_UINT32_BE(n,b,i)                                
        do {                                                    
            (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       
            (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       
            (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       
            (b)[(i) + 3] = (unsigned char) ( (n)       );       
        } while( 0 )
    #endif
    
    
    static void utils_sha256_zeroize(void *v, uint32_t n)
    {
        volatile unsigned char *p = v;
        while (n--) {
            *p++ = 0;
        }
    }
    
    void utils_sha256_init(iot_sha256_context *ctx)
    {
        memset(ctx, 0, sizeof(iot_sha256_context));
    }
    
    void utils_sha256_free(iot_sha256_context *ctx)
    {
        if (NULL == ctx) {
            return;
        }
    
        utils_sha256_zeroize(ctx, sizeof(iot_sha256_context));
    }
    
    void utils_sha256_starts(iot_sha256_context *ctx)
    {
        int is224 = 0;
        ctx->total[0] = 0;
        ctx->total[1] = 0;
    
        if (is224 == 0) {
            /* SHA-256 */
            ctx->state[0] = 0x6A09E667;
            ctx->state[1] = 0xBB67AE85;
            ctx->state[2] = 0x3C6EF372;
            ctx->state[3] = 0xA54FF53A;
            ctx->state[4] = 0x510E527F;
            ctx->state[5] = 0x9B05688C;
            ctx->state[6] = 0x1F83D9AB;
            ctx->state[7] = 0x5BE0CD19;
        }
    
        ctx->is224 = is224;
    }
    
    static const uint32_t K[] = {
        0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
        0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
        0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
        0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
        0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
        0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
        0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
        0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
        0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
        0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
        0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
        0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
        0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
        0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
        0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
        0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2,
    };
    
    #define  SHR(x,n) ((x & 0xFFFFFFFF) >> n)
    #define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))
    
    #define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^  SHR(x, 3))
    #define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^  SHR(x,10))
    
    #define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
    #define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
    
    #define F0(x,y,z) ((x & y) | (z & (x | y)))
    #define F1(x,y,z) (z ^ (x & (y ^ z)))
    
    #define R(t)                                        
        (                                               
                W[t] = S1(W[t -  2]) + W[t -  7] +      
                       S0(W[t - 15]) + W[t - 16]        
        )
    
    #define P(a,b,c,d,e,f,g,h,x,K)                      
        {                                               
            temp1 = h + S3(e) + F1(e,f,g) + K + x;      
            temp2 = S2(a) + F0(a,b,c);                  
            d += temp1; h = temp1 + temp2;              
        }
    
    void utils_sha256_process(iot_sha256_context *ctx, const unsigned char data[64])
    {
        uint32_t temp1, temp2, W[64];
        uint32_t A[8];
        unsigned int i;
    
        for (i = 0; i < 8; i++) {
            A[i] = ctx->state[i];
        }
    
        for (i = 0; i < 64; i++) {
            if (i < 16) {
                GET_UINT32_BE(W[i], data, 4 * i);
            } else {
                R(i);
            }
    
            P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i]);
    
            temp1 = A[7];
            A[7] = A[6];
            A[6] = A[5];
            A[5] = A[4];
            A[4] = A[3];
            A[3] = A[2];
            A[2] = A[1];
            A[1] = A[0];
            A[0] = temp1;
        }
    
        for (i = 0; i < 8; i++) {
            ctx->state[i] += A[i];
        }
    }
    void utils_sha256_update(iot_sha256_context *ctx, const unsigned char *input, uint32_t ilen)
    {
        size_t fill;
        uint32_t left;
    
        if (ilen == 0) {
            return;
        }
    
        left = ctx->total[0] & 0x3F;
        fill = 64 - left;
    
        ctx->total[0] += (uint32_t) ilen;
        ctx->total[0] &= 0xFFFFFFFF;
    
        if (ctx->total[0] < (uint32_t) ilen) {
            ctx->total[1]++;
        }
    
        if (left && ilen >= fill) {
            memcpy((void *)(ctx->buffer + left), input, fill);
            utils_sha256_process(ctx, ctx->buffer);
            input += fill;
            ilen  -= fill;
            left = 0;
        }
    
        while (ilen >= 64) {
            utils_sha256_process(ctx, input);
            input += 64;
            ilen  -= 64;
        }
    
        if (ilen > 0) {
            memcpy((void *)(ctx->buffer + left), input, ilen);
        }
    }
    
    static const unsigned char sha256_padding[64] = {
        0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
    };
    
    void utils_sha256_finish(iot_sha256_context *ctx, uint8_t output[32])
    {
        uint32_t last, padn;
        uint32_t high, low;
        unsigned char msglen[8];
    
        high = (ctx->total[0] >> 29)
               | (ctx->total[1] <<  3);
        low  = (ctx->total[0] <<  3);
    
        PUT_UINT32_BE(high, msglen, 0);
        PUT_UINT32_BE(low,  msglen, 4);
    
        last = ctx->total[0] & 0x3F;
        padn = (last < 56) ? (56 - last) : (120 - last);
    
        utils_sha256_update(ctx, sha256_padding, padn);
        utils_sha256_update(ctx, msglen, 8);
    
        PUT_UINT32_BE(ctx->state[0], output,  0);
        PUT_UINT32_BE(ctx->state[1], output,  4);
        PUT_UINT32_BE(ctx->state[2], output,  8);
        PUT_UINT32_BE(ctx->state[3], output, 12);
        PUT_UINT32_BE(ctx->state[4], output, 16);
        PUT_UINT32_BE(ctx->state[5], output, 20);
        PUT_UINT32_BE(ctx->state[6], output, 24);
    
        if (ctx->is224 == 0) {
            PUT_UINT32_BE(ctx->state[7], output, 28);
        }
    }
    
    void utils_sha256(const uint8_t *input, uint32_t ilen, uint8_t output[32])
    {
        iot_sha256_context ctx;
    
        utils_sha256_init(&ctx);
        utils_sha256_starts(&ctx);
        utils_sha256_update(&ctx, input, ilen);
        utils_sha256_finish(&ctx, output);
        utils_sha256_free(&ctx);
    }
    
    static void utils_hmac_sha256(const uint8_t *msg, uint32_t msg_len, const uint8_t *key, uint32_t key_len, uint8_t output[32])
    {
        iot_sha256_context context;
        uint8_t k_ipad[SHA256_KEY_IOPAD_SIZE];    /* inner padding - key XORd with ipad  */
        uint8_t k_opad[SHA256_KEY_IOPAD_SIZE];    /* outer padding - key XORd with opad */
        int32_t i;
    
        if ((NULL == msg) || (NULL == key) || (NULL == output)) {
            return;
        }
    
        if (key_len > SHA256_KEY_IOPAD_SIZE) {
            return;
        }
    
        /* start out by storing key in pads */
        memset(k_ipad, 0, sizeof(k_ipad));
        memset(k_opad, 0, sizeof(k_opad));
        memcpy(k_ipad, key, key_len);
        memcpy(k_opad, key, key_len);
    
        /* XOR key with ipad and opad values */
        for (i = 0; i < SHA256_KEY_IOPAD_SIZE; i++) {
            k_ipad[i] ^= 0x36;
            k_opad[i] ^= 0x5c;
        }
    
        /* perform inner SHA */
        utils_sha256_init(&context);                                      /* init context for 1st pass */
        utils_sha256_starts(&context);                                    /* setup context for 1st pass */
        utils_sha256_update(&context, k_ipad, SHA256_KEY_IOPAD_SIZE);     /* start with inner pad */
        utils_sha256_update(&context, msg, msg_len);                      /* then text of datagram */
        utils_sha256_finish(&context, output);                            /* finish up 1st pass */
    
        /* perform outer SHA */
        utils_sha256_init(&context);                              /* init context for 2nd pass */
        utils_sha256_starts(&context);                            /* setup context for 2nd pass */
        utils_sha256_update(&context, k_opad, SHA256_KEY_IOPAD_SIZE);    /* start with outer pad */
        utils_sha256_update(&context, output, SHA256_DIGEST_SIZE);     /* then results of 1st hash */
        utils_sha256_finish(&context, output);                       /* finish up 2nd pass */
    }
    View Code

    aiot_c_demo.c 这是你主要编写的代码,你可以参考我下面的

    #include <stdio.h>
    #include <memory.h>
    #include "MQTTClient.h"
    
    #include <stdio.h>
    #include <signal.h>
    #include <sys/time.h>
    
    
    #define Aliyun  
    
    #define EXAMPLE_PRODUCT_KEY            "a11B0MP4tDp"
    #define EXAMPLE_DEVICE_NAME            "1st_device_mqttfx"
    #define EXAMPLE_DEVICE_SECRET          "04dfa2d5fe80a9d993e6c59d6523fe43"
    
    
    
    /* declare the external function aiotMqttSign() */
    extern int aiotMqttSign(const char *productKey, const char *deviceName, const char *deviceSecret, 
                             char clientId[150], char username[65], char password[65]);
    
    volatile int toStop = 0;
    
    void cfinish(int sig)
    {
        signal(SIGINT, NULL);
        toStop = 1;
    }
    
    /*-----------------------------------------------
        printf("%*s", 10, s);
        意思是输出字符串s,但至少占10个位置,不足的在字符串s左边补空格,这里等同于printf("%10s", s);
    -----------------------------------------------*/
    void messageArrived(MessageData* md)
    {
        MQTTMessage* message = md->message;
    
        printf("
    messageArrived!! 
    ");
        printf("%.*s	", md->topicName->lenstring.len, md->topicName->lenstring.data);
        printf("%.*s
    ", (int)message->payloadlen, (char*)message->payload);
    }
    
    /* main function */
    int main(int argc, char** argv)
    {
        int rc = 0;
    
        /* setup the buffer, it must big enough for aliyun IoT platform */
        unsigned char buf[1000];
        unsigned char readbuf[1000];
    
        Network n;
        MQTTClient c;
    
    #ifdef Aliyun    
        char *host = EXAMPLE_PRODUCT_KEY".iot-as-mqtt.cn-shanghai.aliyuncs.com";
        short port =  443;
    
        const char *subTopic = "/"EXAMPLE_PRODUCT_KEY"/"EXAMPLE_DEVICE_NAME"/service/property/set";
        const char *pubTopic = "/sys/"EXAMPLE_PRODUCT_KEY"/"EXAMPLE_DEVICE_NAME"/thing/event/property/post";
    
    #else
        
        char *host = "47.105.141.172";        // "test.mosquitto.org";  
        short port = 1883; 
    
        const char *subTopic = "guest/talk";  // "/publish/TEST/111";
        const char *pubTopic = "guest/talk";  // "/publish/TEST/000";
    
    #endif
    
    
        /* invoke aiotMqttSign to generate mqtt connect parameters */
        char clientId[150] = {0};
        char username[65]  = {0};
        char password[65]  = {0};
    
    #ifdef Aliyun    
        if ((rc = aiotMqttSign(EXAMPLE_PRODUCT_KEY, EXAMPLE_DEVICE_NAME, EXAMPLE_DEVICE_SECRET, clientId, username, password) < 0)) {
            printf("aiotMqttSign -%0x4x
    ", -rc);
            return -1;
        }
        printf("clientid: %s
    ", clientId);
        printf("username: %s
    ", username);
        printf("password: %s
    ", password);
    
    #endif
    
        signal(SIGINT, cfinish);
        signal(SIGTERM, cfinish);
    
        /* network init and establish network to aliyun IoT platform */
        NetworkInit(&n);
        rc = NetworkConnect(&n, host, port);
        printf("NetworkConnect %d
    ", rc);
    
        /* init mqtt client */
        MQTTClientInit(&c, &n, 1000, buf, sizeof(buf), readbuf, sizeof(readbuf));
     
        /* set the default message handler */
        c.defaultMessageHandler = messageArrived;
    
        /* set mqtt connect parameter */
        MQTTPacket_connectData data = MQTTPacket_connectData_initializer;       
        data.willFlag = 0;
        //data.MQTTVersion = 3;  版本号不要指定,要不然连接服务器(执行MQTTConnect时)会返回失败
        data.clientID.cstring = clientId;
        data.username.cstring = username;
        data.password.cstring = password;
        data.keepAliveInterval = 60;
        data.cleansession = 1;
        printf("Connecting to %s %d
    ", host, port);
    
        rc = MQTTConnect(&c, &data);
        if(!rc)
        printf("MQTTConnect %d, Connect aliyun IoT Cloud Success!
    ", rc);
    
    
        printf("Subscribing to %s
    ", subTopic);
        rc = MQTTSubscribe(&c, subTopic, 1, messageArrived);
        printf("MQTTSubscribe %d
    ", rc);
    
    
        int cnt = 0;
        unsigned int msgid = 0;
    
        char mqttdata[] = {"{"method":"thing.event.property.post","id":"1371514638","params":{"Humidity":76},"version":"1.0.0"}"};
        printf("mqttdata==> %s
    
    ", mqttdata);
    
        while (!toStop)
        {
            // MQTT_Yield会block住timeout的时间去尝试接收数据,直到timeout才会退出
            MQTTYield(&c, 1000); // 在需要接收数据时, 都需要主动调用该函数    
    
            if (++cnt % 20 == 0) { // every 5 seconds, will do this 
                MQTTMessage msg = {
                    QOS0, 
                    1, // 0 ?
                    0,
                    0,
                    mqttdata,     
                    strlen(mqttdata),
                };
                       msg.id = ++msgid;
               rc = MQTTPublish(&c, pubTopic, &msg);
               printf("MQTTPublish %d, msgid %d
    ", rc, msgid);
            }
        }
    
        printf("Stopping
    ");
    
        MQTTDisconnect(&c);
        NetworkDisconnect(&n);
    
        return 0;
    }

    结果

     

     

     

     

     

     

    .

    /************* 社会的有色眼光是:博士生、研究生、本科生、车间工人; 重点大学高材生、普通院校、二流院校、野鸡大学; 年薪百万、五十万、五万; 这些都只是帽子,可以失败千百次,但我和社会都觉得,人只要成功一次,就能换一顶帽子,只是社会看不见你之前的失败的帽子。 当然,换帽子决不是最终目的,走好自己的路就行。 杭州.大话西游 *******/
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  • 原文地址:https://www.cnblogs.com/happybirthdaytoyou/p/14074606.html
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