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AWS IOT Device C SDK 使用(阿里云一机一密、一型一密、公钥、私钥、CA、根证书、加签、验签、哈希、X.509)

香港股票行情 • 2022-9-23 • 区块链 • 阅读 161

AWS IOT Device C SDK 使用(阿里云一机一密、一型一密、公钥、私钥、CA、根证书、加签、验签、哈希、X.509),第1张

AWS IOT Device C SDK 使用

AWS IOT接入及测试

阿里云设备影子：类似MQTT的遗嘱

阿里云设备接入、设备管理方案

阿里云：一机一密、一型一密、CA证书、证书获取、证书烧录
公钥、私钥、数字签名和数字证书的概念及解密

SSL数字证书（一）CA、根证书与数字证书：根证书是CA认证中心给自己颁发的证书，是信任链的起始点
公钥、私钥、证书、加密、解密、加签、验签
公钥、私钥、hash、数字签名、CA以及验证过程：证书的格式一般为X.509或者Base64编码

亚马逊云物联网AWS IoT初体验

烟感器设备接入AWS IOT的一种方法

如何把设备安全的接入AWS IoT（一）

如何把设备安全的接入AWS IoT（二）

AWS Client端SDK授权方案(Amazon Cognito 身份池)

重点关注main函数里4个重要API函数：
1、jsonStruct_t
2、aws_iot_shadow_register_delta
3、aws_iot_shadow_get
4、aws_iot_shadow_update

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "aws_iot_config.h"
#include "aws_iot_log.h"
#include "aws_iot_version.h"
#include "aws_iot_mqtt_client_interface.h"
#include "aws_iot_shadow_interface.h"
#define MAX_LENGTH_OF_UPDATE_JSON_BUFFER 400
static char certDirectory[PATH_MAX + 1] = "./certs";
#define HOST_ADDRESS_SIZE 255
static char HostAddress[HOST_ADDRESS_SIZE] = AWS_IOT_MQTT_HOST;
static uint32_t port = AWS_IOT_MQTT_PORT;
static uint8_t numPubs = 5;


typedef struct cameras{
    int power;
    int stream;
}cameraState; 
cameraState camera;          //照相机的物模型
int reporetedFlag = 0;


void ShadowUpdateStatusCallback(const char *pThingName, ShadowActions_t action, Shadow_Ack_Status_t status,
                                const char *pReceivedJsonDocument, void *pContextData) {
    //device 发起update请求,收到server accpected消息时会触发这个回调，用于判断update状态是否成功
    if(SHADOW_ACK_TIMEOUT == status) {
        IOT_INFO("Update Timeout--");
    } else if(SHADOW_ACK_REJECTED == status) {
        IOT_INFO("Update RejectedXX");
    } else if(SHADOW_ACK_ACCEPTED == status) {
        IOT_INFO("Update Accepted !!");
    }
}



//***************CJSON*********************// parseCMDJSON create_monitor_with_helpers用于解析或构造state内容
int parseCMDJSON(const char * const monitor){//使用CJSON解析get shadow返回的消息
    const cJSON *state = NULL;
    const cJSON *desired = NULL;
    const cJSON *reported = NULL;
    const cJSON *power = NULL;
    const cJSON *stream = NULL;
    int status = 0;
    cJSON *monitor_json = cJSON_Parse(monitor);//它将解析JSON并分配cJSON表示它的项目树。
    if (monitor_json == NULL)
    {
        const char *error_ptr = cJSON_GetErrorPtr();
        if (error_ptr != NULL)
        {
            fprintf(stderr, "Error before: %s\n", error_ptr);
        }
        status = 0;
        goto end;
    }
    state = cJSON_GetObjectItemCaseSensitive(monitor_json, "state");        //得到state内容
    if (cJSON_IsString(state) && (state->valuestring != NULL))
    {
        printf("Checking monitor \"%s\"\n", state->valuestring);
    }
    desired = cJSON_GetObjectItemCaseSensitive(state, "desired");           //从stated尝试解析desired
    reported = cJSON_GetObjectItemCaseSensitive(state, "reported");         //从stated尝试解析reported
    
    
    if(!cJSON_IsNull(reported))//如果reported不为空
    {
        power = cJSON_GetObjectItemCaseSensitive(reported, "power");
        stream = cJSON_GetObjectItemCaseSensitive(reported, "stream");
        if (cJSON_IsNumber(power)){
            camera.power = power->valueint;                                 //使用云上状态同步本地状态
            IOT_INFO("reported power:%d",   camera.power );
        }
        if (cJSON_IsNumber(stream)){
            camera.stream = stream->valueint;                               //使用云上状态同步本地状态
            IOT_INFO("reported stream:%d",  camera.stream);
        }
        status = 1;
    }


    if (!cJSON_IsNull(desired))//如果desired不为空，所以应该用desired状态同步本状态。上面reported同步的状态将被覆盖
    {
        power = cJSON_GetObjectItemCaseSensitive(desired, "power");
        stream = cJSON_GetObjectItemCaseSensitive(desired, "stream");
        if (cJSON_IsNumber(power)){ 
            camera.power = power->valueint;
            IOT_INFO("desired power:%d",    camera.power );
        }
        if (cJSON_IsNumber(stream)){ 
            camera.stream = stream->valueint;
            IOT_INFO("desired stream:%d",   camera.stream);
        }
        reporetedFlag = 1;//更新状态
        status = 1;
    }
end:
    cJSON_Delete(monitor_json);
    return status;
}




char *create_monitor_with_helpers(void)//构造reported update 的state内容 
{
    char *string = NULL;
    cJSON *monitor = cJSON_CreateObject();
    cJSON *state = cJSON_CreateObject();
    cJSON *reporteds = cJSON_CreateObject();
    cJSON *desired = cJSON_CreateObject();
    cJSON *reported = cJSON_CreateObject();
    if (cJSON_AddNumberToObject(reported, "power", camera.power) == NULL)       //构造power属性到reported中
        goto end;
    if (cJSON_AddNumberToObject(reported, "stream", camera.stream) == NULL)     //构造stream属性到reported中
        goto end;
    cJSON_AddItemToObject(state, "reported", reported);
    cJSON_AddItemToObject(state, "desired", desired);       //将reported和desired添加到state
    cJSON_AddItemToObject(monitor, "state", state);         //将state添加到返回的主json中

    char tempClientTokenBuffer[MAX_SIZE_CLIENT_TOKEN_CLIENT_SEQUENCE];
    if(aws_iot_fill_with_client_token(tempClientTokenBuffer, MAX_SIZE_CLIENT_TOKEN_CLIENT_SEQUENCE) != SUCCESS){
        return false;
    }
    cJSON_AddStringToObject(monitor, "clientToken", tempClientTokenBuffer);//将clientToken标识添加到主JSON中
    string = cJSON_PrintUnformatted(monitor);//生成JSON PrintUnformatted函数为不格式化生成，生成一个紧凑的json字串 
    if (string == NULL) {
        fprintf(stderr, "Failed to print monitor.\n");
    }
end:
    cJSON_Delete(monitor);
    return string;
}



// get shadow API的回调 当得到server返回时会触发这个函数
                                                //收到的回复的名称           *** 作的反应      通知 *** 作是接受/拒绝/超时
static void ShadowGetStatusCallback(const char *pThingName, ShadowActions_t action, Shadow_Ack_Status_t status,
                                const char *pReceivedJsonDocument, void *pContextData) {
                                            //收到json文档         动作调用期间传入的void *数据（更新，获取或删除）
    IOT_INFO("get shadow json:\n%s",pReceivedJsonDocument);
    parseCMDJSON(pReceivedJsonDocument);//解析出reported desired 
    if(SHADOW_ACK_TIMEOUT == status) {
        IOT_INFO("get Timeout--");
    } else if(SHADOW_ACK_REJECTED == status) {
        IOT_INFO("get RejectedXX");
    } else if(SHADOW_ACK_ACCEPTED == status) {
        IOT_INFO("get Accepted !!");
    }
}





//************************************************************************//
//当收到delta消息中中含有该属性时 会触发该回调函数
                                //json数据内容           json数据长度
void power_Callback(const char *pJsonString, uint32_t JsonStringDataLen, jsonStruct_t *pContext) {
    char res[10];
    strncpy(res, pJsonString, JsonStringDataLen);
    camera.power = atoi(res);//得到delta消息中power的值
    if(camera.power == 1){
        IOT_INFO("power on");
    }
    else{
        IOT_INFO("power off");
    }
    reporetedFlag = 1;
}
//当收到delta消息中中含有该属性时 会触发该回到函数
void stream_Callback(const char *pJsonString, uint32_t JsonStringDataLen, jsonStruct_t *pContext) {
    char res[10];
    strncpy(res, pJsonString, JsonStringDataLen);
    camera.stream = atoi(res);//得到delta消息中stream的值
    if(camera.stream == 0){
        IOT_INFO("stream off");
    }
    else{
        IOT_INFO("stream open");
    }
    reporetedFlag = 1;
}
//************************************************************************//






void iot_reporte(AWS_IoT_Client *mqttClient, jsonStruct_t JsonHander[2]){
    IoT_Error_t rc = FAILURE;
    char JsonDocumentBuffer[MAX_LENGTH_OF_UPDATE_JSON_BUFFER];
    size_t sizeOfJsonDocumentBuffer = sizeof(JsonDocumentBuffer) / sizeof(JsonDocumentBuffer[0]);
    char test[300];
    strcpy(test, create_monitor_with_helpers());
    IOT_INFO("Update Shadow: %s", test);
    rc = aws_iot_shadow_update(mqttClient, AWS_IOT_MY_THING_NAME, test,ShadowUpdateStatusCallback, NULL, 10, true);//数字为超时时间       调用aws_iot_shadow_update
}







int main(int argc, char **argv) {
    IoT_Error_t rc = FAILURE;
    int32_t i = 0;
    char *pJsonStringToUpdate;
    
    jsonStruct_t powerHandler;                                                                            //1、jsonStruct_t state中某个属性 有4个成员
    powerHandler.cb = power_Callback;     //当接受delta消息有该参数时触发的回调函数地址
    powerHandler.pKey = "power";          //属性名称
    powerHandler.pData = &(camera.power); //属性值地址
    powerHandler.dataLength = sizeof(int);//属性大小
    powerHandler.type = SHADOW_JSON_INT32;//属性类型
    
    jsonStruct_t streamHandler;                                                                           //1、jsonStruct_t state中某个属性 有4个成员
    streamHandler.cb = stream_Callback;
    streamHandler.pKey = "stream";
    streamHandler.pData = &(camera.stream);
    streamHandler.dataLength = sizeof(int);
    streamHandler.type = SHADOW_JSON_INT32;

    jsonStruct_t HandlerArray[2] = {powerHandler, streamHandler};
    //******************完成client为接入 iot server 不用更改*************//
    char rootCA[PATH_MAX + 1];
    char clientCRT[PATH_MAX + 1];
    char clientKey[PATH_MAX + 1];
    char CurrentWD[PATH_MAX + 1];
    IOT_INFO("\nAWS IoT SDK Version %d.%d.%d-%s\n", VERSION_MAJOR, VERSION_MINOR, VERSION_PATCH, VERSION_TAG);
    getcwd(CurrentWD, sizeof(CurrentWD));
    snprintf(rootCA, PATH_MAX + 1, "%s/%s/%s", CurrentWD, certDirectory, AWS_IOT_ROOT_CA_FILENAME);
    snprintf(clientCRT, PATH_MAX + 1, "%s/%s/%s", CurrentWD, certDirectory, AWS_IOT_CERTIFICATE_FILENAME);
    snprintf(clientKey, PATH_MAX + 1, "%s/%s/%s", CurrentWD, certDirectory, AWS_IOT_PRIVATE_KEY_FILENAME);
    AWS_IoT_Client mqttClient;
    ShadowInitParameters_t sp = ShadowInitParametersDefault;
    sp.pHost = AWS_IOT_MQTT_HOST;
    sp.port = AWS_IOT_MQTT_PORT;
    sp.pClientCRT = clientCRT;
    sp.pClientKey = clientKey;
    sp.pRootCA = rootCA;
    sp.enableAutoReconnect = false;
    sp.disconnectHandler = NULL;
    IOT_INFO("Shadow Init");
    rc = aws_iot_shadow_init(&mqttClient, &sp);
    if(SUCCESS != rc) {
        IOT_ERROR("Shadow Connection Error");
        return rc;
    }
    ShadowConnectParameters_t scp = ShadowConnectParametersDefault;
    scp.pMyThingName = AWS_IOT_MY_THING_NAME;
    scp.pMqttClientId = AWS_IOT_MQTT_CLIENT_ID;
    scp.mqttClientIdLen = (uint16_t) strlen(AWS_IOT_MQTT_CLIENT_ID);
    IOT_INFO("Shadow Connect");
    rc = aws_iot_shadow_connect(&mqttClient, &scp);
    if(SUCCESS != rc) {
        IOT_ERROR("Shadow Connection Error");
        return rc;
    }
    rc = aws_iot_shadow_set_autoreconnect_status(&mqttClient, true);
    if(SUCCESS != rc) {
        IOT_ERROR("Unable to set Auto Reconnect to true - %d", rc);
        return rc;
    }
    
    
    //*******************************//                                                                  
    rc = aws_iot_shadow_register_delta(&mqttClient, &streamHandler);                                     //2、aws_iot_shadow_register_delta(收到增量消息触发1中回调函数)
    rc = aws_iot_shadow_register_delta(&mqttClient, &powerHandler);
    if(SUCCESS != rc) {
        IOT_ERROR("Shadow Register Delta Error");
    }
    else{
        IOT_INFO("Shadow Register Success");
        camera.power = 1;
        camera.stream = 0;                                                           数字为超时时间                                       
        aws_iot_shadow_get(&mqttClient, AWS_IOT_MY_THING_NAME, ShadowGetStatusCallback, NULL, 2, true);  //3、aws_iot_shadow_get(一般启动时获取设备配置)
        // while(updateFlag==0){                                                                         //   shadow_get的结果将在callback中传递给程序
        //  sleep(1);
        // }
        // iot_reporte(&mqttClient, HandlerArray);                                                       //4、aws_iot_shadow_update
        // 上线自检 更新状态
    }


    while(NETWORK_ATTEMPTING_RECONNECT == rc || NETWORK_RECONNECTED == rc || SUCCESS == rc) {
        rc = aws_iot_shadow_yield(&mqttClient, 200);//此函数可以在单独的线程中使用，等待传入消息，确保使用AWS服务保持连接。它还确保清除Shadow *** 作的过期请求并执行Timeout回调。
        if(NETWORK_ATTEMPTING_RECONNECT == rc) {
            continue;
        }
        if(reporetedFlag == 1){   //检测状态改变标志位 进行reported当前状态
            IOT_INFO("stream and power handle function");  
            iot_reporte(&mqttClient, HandlerArray);                                                      //4、aws_iot_shadow_update(向云端更新设备影子，只更新不跟踪)
            reporetedFlag = 0;
        }
        sleep(1);
    }

    if(SUCCESS != rc) {
        IOT_ERROR("An error occurred in the loop %d", rc);
    }
    IOT_INFO("Disconnecting");
    rc = aws_iot_shadow_disconnect(&mqttClient);           
    if(SUCCESS != rc) {
        IOT_ERROR("Disconnect error %d", rc);
    }
    return rc;
}

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