基于stm32通过广和通L610通信模组与腾讯云连接代码

以下是基于STM32通过广和通L610通信模组与腾讯云连接的代码示例：

#include "stm32f10x.h"
#include "gprs.h"
#include "string.h"
#include "stdio.h"

#define APN "CMNET"
#define USER ""
#define PASS ""

#define IP "mqtt.tencentdevices.com"
#define PORT 1883

#define CLIENT_ID "my_client_id"
#define USERNAME "my_username"
#define PASSWORD "my_password"

#define MQTT_TOPIC "/my_topic"
#define MQTT_QOS 0

#define GPRS_RX_BUF_SIZE 1024
#define GPRS_TX_BUF_SIZE 1024

uint8_t gprs_rx_buf[GPRS_RX_BUF_SIZE];
uint8_t gprs_tx_buf[GPRS_TX_BUF_SIZE];

uint8_t mqtt_rx_buf[GPRS_RX_BUF_SIZE];
uint8_t mqtt_tx_buf[GPRS_TX_BUF_SIZE];

int main(void)
{
    uint8_t ip[16];
    uint16_t port;
    uint8_t client_id[32];
    uint8_t username[32];
    uint8_t password[32];
    uint8_t topic[64];

    // 初始化GPRS模块
    gprs_init(gprs_rx_buf, GPRS_RX_BUF_SIZE, gprs_tx_buf, GPRS_TX_BUF_SIZE);

    // 连接GPRS网络
    if (!gprs_connect(APN, USER, PASS)) {
        printf("GPRS connect failed!\n");
        while (1);
    }

    // 获取IP地址和端口号
    if (!gprs_get_ip_port(IP, PORT, ip, &port)) {
        printf("Get IP and port failed!\n");
        while (1);
    }

    // 连接MQTT服务器
    if (!mqtt_connect(ip, port, client_id, username, password)) {
        printf("MQTT connect failed!\n");
        while (1);
    }

    // 发布消息
    if (!mqtt_publish(MQTT_TOPIC, MQTT_QOS, "Hello, world!")) {
        printf("MQTT publish failed!\n");
        while (1);
    }

    // 订阅消息
    if (!mqtt_subscribe(MQTT_TOPIC, MQTT_QOS)) {
        printf("MQTT subscribe failed!\n");
        while (1);
    }

    // 接收消息
    mqtt_receive(mqtt_rx_buf, GPRS_RX_BUF_SIZE);

    // 断开MQTT连接
    mqtt_disconnect();

    // 断开GPRS连接
    gprs_disconnect();

    while (1);
}

其中，`gprs_init`、`gprs_connect`、`gprs_get_ip_port`、`gprs_disconnect`是自定义的GPRS模块初始化、连接、获取IP地址和端口号、断开连接函数；`mqtt_connect`、`mqtt_publish`、`mqtt_subscribe`、`mqtt_receive`、`mqtt_disconnect`是自定义的MQTT连接、发布消息、订阅消息、接收消息、断开连接函数。你需要根据你使用的GPRS模块和MQTT库进行相应的修改。