51单片机 esp8266-01sMQTT程序代码

以下是51单片机和esp8266-01s结合使用的MQTT程序代码：

#include <reg52.h>
#include <string.h>
#include <stdio.h>

#define uchar unsigned char
#define uint unsigned int

sbit LED = P1^0;

// 定义ESP8266的发送和接收缓冲区
uchar ESP8266_RX_BUF[1024];
uchar ESP8266_TX_BUF[1024];

// 定义MQTT服务器的IP地址和端口号
uchar MQTT_SERVER_IP[] = "192.168.1.100";
uchar MQTT_SERVER_PORT[] = "1883";

// 定义MQTT连接的用户名和密码
uchar MQTT_USERNAME[] = "username";
uchar MQTT_PASSWORD[] = "password";

// 定义MQTT客户端ID和主题
uchar MQTT_CLIENT_ID[] = "client_id";
uchar MQTT_TOPIC[] = "topic";

// 定义MQTT连接和发布消息的命令
uchar MQTT_CONNECT_CMD[] = {0x10, 0x0e, 0x00, 0x06, 'M', 'Q', 'I', 's', 'd', 'p', 0x03, 0x02, 0x00, 0x3c, 0x00};
uchar MQTT_PUBLISH_CMD[] = {0x30, 0x0c, 0x00, 0x04, 't', 'o', 'p', 'i', 'c', 0x00, 0x01, '1', '2'};

// 定义MQTT连接状态和接收到的消息
bit MQTT_CONNECTED = 0;
uchar MQTT_MSG_BUF[1024];

// 定义函数声明
void ESP8266_Init();
void ESP8266_SendCmd(uchar *cmd);
void ESP8266_SendData(uchar *data);
void ESP8266_ReceiveData();
void MQTT_Connect();
void MQTT_Publish(uchar *msg);

void main()
{
    ESP8266_Init();
    while(1)
    {
        if(MQTT_CONNECTED)
        {
            // 如果已经连接MQTT服务器，则发送消息
            MQTT_Publish("Hello, MQTT!");
            LED = ~LED;
            delay(1000);
        }
        else
        {
            // 如果未连接MQTT服务器，则尝试连接
            MQTT_Connect();
        }
    }
}

// ESP8266初始化函数
void ESP8266_Init()
{
    // 设置波特率为115200
    TMOD = 0x20;
    TH1 = 0xfd;
    TL1 = 0xfd;
    TR1 = 1;

    // 发送AT指令，检查ESP8266是否正常工作
    ESP8266_SendCmd("AT\r\n");
    ESP8266_ReceiveData();

    // 设置ESP8266为STA模式
    ESP8266_SendCmd("AT+CWMODE=1\r\n");
    ESP8266_ReceiveData();

    // 连接WiFi网络
    ESP8266_SendCmd("AT+CWJAP=\"SSID\",\"PASSWORD\"\r\n");
    ESP8266_ReceiveData();
}

// ESP8266发送AT指令函数
void ESP8266_SendCmd(uchar *cmd)
{
    uint i = 0;
    while(cmd[i] != '\0')
    {
        SBUF = cmd[i];
        while(!TI);
        TI = 0;
        i++;
    }
}

// ESP8266发送数据函数
void ESP8266_SendData(uchar *data)
{
    uint i = 0;
    while(data[i] != '\0')
    {
        SBUF = data[i];
        while(!TI);
        TI = 0;
        i++;
    }
}

// ESP8266接收数据函数
void ESP8266_ReceiveData()
{
    uint i = 0;
    while(1)
    {
        if(RI)
        {
            RI = 0;
            ESP8266_RX_BUF[i] = SBUF;
            i++;
            if(i >= 1024)
            {
                i = 0;
            }
            if(strstr(ESP8266_RX_BUF, "OK") != NULL)
            {
                memset(ESP8266_RX_BUF, 0, sizeof(ESP8266_RX_BUF));
                break;
            }
        }
    }
}

// MQTT连接函数
void MQTT_Connect()
{
    // 建立TCP连接
    ESP8266_SendCmd("AT+CIPSTART=\"TCP\",\"");
    ESP8266_SendData(MQTT_SERVER_IP);
    ESP8266_SendCmd("\",");
    ESP8266_SendData(MQTT_SERVER_PORT);
    ESP8266_SendCmd("\r\n");
    ESP8266_ReceiveData();

    // 发送MQTT连接命令
    ESP8266_SendCmd("AT+CIPSEND=");
    ESP8266_SendData("22\r\n");
    ESP8266_SendData(MQTT_CONNECT_CMD);
    ESP8266_ReceiveData();

    // 发送MQTT用户名和密码
    ESP8266_SendCmd("AT+CIPSEND=");
    ESP8266_SendData("32\r\n");
    ESP8266_SendData(MQTT_USERNAME);
    ESP8266_SendData("\x00");
    ESP8266_SendData(MQTT_PASSWORD);
    ESP8266_ReceiveData();

    // 订阅MQTT主题
    ESP8266_SendCmd("AT+CIPSEND=");
    ESP8266_SendData("13\r\n");
    ESP8266_SendData("\x82\x09");
    ESP8266_SendData("\x00\x01");
    ESP8266_SendData("\x00\x06");
    ESP8266_SendData(MQTT_TOPIC);
    ESP8266_SendData("\x00");
    ESP8266_ReceiveData();

    MQTT_CONNECTED = 1;
}

// MQTT发布消息函数
void MQTT_Publish(uchar *msg)
{
    // 发送MQTT发布命令
    ESP8266_SendCmd("AT+CIPSEND=");
    ESP8266_SendData("16\r\n");
    ESP8266_SendData(MQTT_PUBLISH_CMD);

    // 发送消息内容
    uint len = strlen(msg);
    ESP8266_SendCmd("AT+CIPSEND=");
    ESP8266_SendData("2\r\n");
    ESP8266_SendData((uchar *)&len);
    ESP8266_SendCmd("\r\n");
    ESP8266_SendData(msg);
    ESP8266_ReceiveData();
}

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