开发者成长激励计划-基于TencentOS Tiny 手把手教你通过腾讯连连小小程序控制板子的4个LED灯

void default_message_handler(mqtt_message_t* msg)
{
    printf("callback:\\r\\n");
    printf("---------------------------------------------------------\\r\\n");
    printf("\\ttopic:%s\\r\\n", msg->topic);
    printf("\\tpayload:%s\\r\\n", msg->payload);
    printf("---------------------------------------------------------\\r\\n");

    cJSON *root = NULL;
    cJSON *params = NULL;
    cJSON *method = NULL;
    cJSON *power_switch = NULL;
    
    /*解析从云端收到的控制信息，示例控制信息为*/
    //payload:"{"method":"control","clientToken":"clientToken-@Ropy0JGd","params":{"power_switch":0}}"
    root = cJSON_Parse(msg->payload +1);
    if (!root){
        printf("Invalid json root\\r\\n");
        return;
    }

    /* 解析出method*/
    method = cJSON_GetObjectItem(root, "method");
    if (!method){
        printf("Invalid json method\\r\\n");
        cJSON_Delete(root);
        return;
    }

    /* 仅处理云端下发的 control 数据*/
    if (0 != strncmp(method->valuestring, "control", sizeof("control") - 1)){
        cJSON_Delete(root);
        return;
    }

    /*解析出params*/
    params = cJSON_GetObjectItem(root, "params");
    if (!params){
        printf("Invalid json params\\r\\n");
        cJSON_Delete(root);
        return;
    }
    /*解析出 power_switch*/
    power_switch = cJSON_GetObjectItem(params, "power_switch");
    /*根据 power_switch 控制实际硬件开关*/
    if (power_switch->valueint){
        GPIO_WriteBit(GPIOE, GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5, 0);
    }else{
        GPIO_WriteBit(GPIOE, GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5, 1);
    }

    cJSON_Delete(root);
}