/* product Id  */
static char sg_product_id[MAX_SIZE_OF_PRODUCT_ID + 1]	 = "PRODUCT_ID";

/* device name */
static char sg_device_name[MAX_SIZE_OF_DEVICE_NAME + 1]  = "YOUR_DEV_NAME";

#ifdef DEV_DYN_REG_ENABLED
/* product secret for device dynamic Registration  */
static char sg_product_secret[MAX_SIZE_OF_PRODUCT_SECRET + 1]  = "YOUR_PRODUCT_SECRET";
#endif

#ifdef AUTH_MODE_CERT
/* public cert file name of certificate device */
static char sg_device_cert_file_name[MAX_SIZE_OF_DEVICE_CERT_FILE_NAME + 1]      = "YOUR_DEVICE_NAME_cert.crt";
/* private key file name of certificate device */
static char sg_device_privatekey_file_name[MAX_SIZE_OF_DEVICE_SECRET_FILE_NAME + 1] = "YOUR_DEVICE_NAME_private.key";
#else
/* device secret of PSK device */
static char sg_device_secret[MAX_SIZE_OF_DEVICE_SECRET + 1] = "YOUR_IOT_PSK";
#endif

{
    "auth_mode":"KEY/CERT",

    "productId":"PRODUCT_ID",
    "productSecret":"YOUR_PRODUCT_SECRET",
    "deviceName":"YOUR_DEV_NAME",

    "key_deviceinfo":{    
        "deviceSecret":"YOUR_IOT_PSK"
    },

    "cert_deviceinfo":{
        "devCertFile":"YOUR_DEVICE_CERT_FILE_NAME",
        "devPrivateKeyFile":"YOUR_DEVICE_PRIVATE_KEY_FILE_NAME"
    },

    "subDev":{
        "sub_productId":"YOUR_SUBDEV_PRODUCT_ID",
        "sub_devName":"YOUR_SUBDEV_DEVICE_NAME"
    }
}

static DeviceInfo sg_devInfo;

static int _setup_connect_init_params(MQTTInitParams* initParams)
{
    int ret;

    ret = HAL_GetDevInfo((void *)&sg_devInfo);	
    if(QCLOUD_ERR_SUCCESS != ret){
        return ret;
    }

    initParams->device_name = sg_devInfo.device_name;
    initParams->product_id = sg_devInfo.product_id;
     ......
}	

static int _serialize_connect_packet(unsigned char *buf, size_t buf_len, MQTTConnectParams *options, uint32_t *serialized_len) {
            ......
            ......
    int username_len = strlen(options->client_id) + strlen(QCLOUD_IOT_DEVICE_SDK_APPID) + MAX_CONN_ID_LEN + cur_timesec_len + 4;
    options->username = (char*)HAL_Malloc(username_len);
    get_next_conn_id(options->conn_id);
    HAL_Snprintf(options->username, username_len, "%s;%s;%s;%ld", options->client_id, QCLOUD_IOT_DEVICE_SDK_APPID, options->conn_id, cur_timesec);

#if defined(AUTH_WITH_NOTLS) && defined(AUTH_MODE_KEY)
     if (options->device_secret != NULL && options->username != NULL) {
         char                sign[41]   = {0};
         utils_hmac_sha1(options->username, strlen(options->username), sign, options->device_secret, options->device_secret_len);
         options->password = (char*) HAL_Malloc (51);
         if (options->password == NULL) IOT_FUNC_EXIT_RC(QCLOUD_ERR_INVAL);
         HAL_Snprintf(options->password, 51, "%s;hmacsha1", sign);
     }
#endif
            ......
}