[lwIP学习营]【第三周】onenet 应用

发布于 2018-06-03 16:40:17 浏览：2491 订阅该版

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本帖最后由 来一颗糖 于 2018-6-4 09:10 编辑

[md]# 【LwIP学习营】第三周小作业  #

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## 开发板向onenet应用上传信息 ##
调用onenet_http.c中的两个函数.
```
/* Device send data to OneNET cloud. */
rt_err_t onenet_http_upload_digit(const char *name, double digit);//发送数字
rt_err_t onenet_http_upload_string(const char *name, char *str);//发送字符串
```
示例
```
static void onenet_upload_entry(void *parameter)
{
    int value = 0;
    rt_uint8_t major,minor;
    while (1)
    {
        value = rand() % 100;

if (onenet_http_upload_digit("temperature", value) < 0)
        {
            break;
        }
        cpu_usage_get(&major,&minor);
        if (onenet_http_upload_digit("CPU", major) < 0)
        {
            break;
        }
        rt_thread_delay(500);
    }
}
```

## onenet应用旋钮调节控制开发板屏幕亮度 ##
自己实现onenet_mqtt.c中onenet_port_data_process().
```
int onenet_port_data_process(char *recv_data, rt_size_t size)
{
    rt_kprintf("\r\n%s\r\n", recv_data);
    char *addr;
    rt_uint16_t *date;
    addr = strstr(recv_data, "brightness");
    if (addr)
    {
        *date = (rt_uint16_t)str2int(&addr[10]);
        *date = *date << 8;
        dwin_var_write(0x0082, date, 1);//控制屏幕亮度的函数.
    }
    rt_memset(recv_data, 0, size);
    return 0;
}
```
**如下图所示创建应用.**
![](https://i.imgur.com/2rWhodC.png)
**如下图三个步骤,将创建一个向开发板发送固定格式消息的的旋钮开关.**
![](https://i.imgur.com/ExBf6Pi.png)
调整旋钮,onenet应用将向开发板发送brightnessXXX字符串.其中XXX表示旋钮的值.

## 实验效果 ##
![](https://i.imgur.com/HBt2VEh.gif)[/md]