HMI-Board以太网数据监视器（二）MQTT和LVGL

$\int dE = \int \frac{kdq}{r^2} = \frac{k}{L} \int \frac{dq}{r^2}$

$\frac{Q}{2\pi\epsilon L^2}$

$\Gamma(n) = (n-1)!\quad\forall n\in\mathbb N$
$\Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt\,.$

最近在玩Latex有没有一起的啊

HMI-Board以太网数据监视器

开发工具

 RT-Thread Studio/Keil MDK5（固件开发、编译）
 SquareLine Studio（LVGL UI设计工具）

资料链接

 RT-Thread Studio下载链接：
https://download_redirect.rt-thread.org/download/studio/RT-Thread_Studio_2.2.7-setup-x86_64.exe
 SquareLine Studio下载链接：https://static.squareline.io/downloads/SquareLine_Studio_Windows_v1_3_2.zip
 MQTTX 下载链接：
https://packages.emqx.net/MQTTX/v1.9.6/MQTTX-Setup-1.9.6-x64.exe
 项目代码链接：
hmi-board-eth-monitor
安装HMI-Board的开发板支持包

实践环节二：MQTT 软件包的使用

基于刚刚创建好的示例工程：
在 RT-Thread Setting 中搜索 Kawaii-mqtt 软件包，并使能mqtt test功能，
然后ctrl+s 拉取软件包到工程内：

示例代码：
将下面代码粘贴覆盖 packages/kawaii-mqtt-latest/test/test.c

实在不行是可以手动拖的。

#include <stdio.h>
#include <stdint.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#include "mqttclient.h"

static void sub_topic_handle1(void* client, message_data_t* msg)
{
    (void) client;
    KAWAII_MQTT_LOG_I("-----------------------------------------------------------------------------------");
    KAWAII_MQTT_LOG_I("%s:%d %s()...\ntopic: %s\nmessage:%s", __FILE__, __LINE__, __FUNCTION__, msg->topic_name, (char*)msg->message->payload);
    KAWAII_MQTT_LOG_I("-----------------------------------------------------------------------------------");
}

static int mqtt_publish_handle1(mqtt_client_t *client)
{
    mqtt_message_t msg;
    memset(&msg, 0, sizeof(msg));

    msg.qos = QOS0;
    msg.payload = (void *)"this is a kawaii mqtt test ...";

    return mqtt_publish(client, "pub5323", &msg);
}

static char cid[64] = { 0 };
static void kawaii_mqtt_demo(void *parameter)
{
    mqtt_client_t *client = NULL;
    
    rt_thread_delay(6000);
    
    mqtt_log_init();

    client = mqtt_lease();

    rt_snprintf(cid, sizeof(cid), "rtthread-5323", rt_tick_get());

    mqtt_set_host(client, "broker.emqx.io");
    mqtt_set_port(client, "1883");
    mqtt_set_user_name(client, "RT-Thread");
    mqtt_set_password(client, "012345678");
    mqtt_set_client_id(client, cid);
    mqtt_set_clean_session(client, 1);

    KAWAII_MQTT_LOG_I("The ID of the Kawaii client is: %s ",cid);

    mqtt_connect(client);
    
    mqtt_subscribe(client, "sub5323", QOS0, sub_topic_handle1);
    
    while (1) {
        mqtt_publish_handle1(client);
                               
        mqtt_sleep_ms(4 * 1000);
    }
}

int ka_mqtt(void)
{
    rt_thread_t tid_mqtt;

    tid_mqtt = rt_thread_create("kawaii_demo", kawaii_mqtt_demo, RT_NULL, 2048, 17, 10);
    if (tid_mqtt == RT_NULL) {
        return -RT_ERROR;
    }

    rt_thread_startup(tid_mqtt);

    return RT_EOK;
}
MSH_CMD_EXPORT(ka_mqtt, Kawaii MQTT client test program);