在STM32上用SIM7600CE模块的AT指令通过SMTP发送邮件附件实现代码

以下是在STM32上使用SIM7600CE模块的AT指令通过SMTP发送邮件附件的示例代码：

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

#define UARTx                       USART1
#define UARTx_BAUDRATE              115200
#define UARTx_RX_PIN                GPIO_Pin_10
#define UARTx_TX_PIN                GPIO_Pin_9
#define UARTx_GPIO_PORT             GPIOA
#define UARTx_GPIO_CLK              RCC_APB2Periph_GPIOA
#define UARTx_CLK                   RCC_APB2Periph_USART1

#define SIM7600CE_SMTP_SERVER       "smtp.example.com"       //SMTP服务器地址
#define SIM7600CE_SMTP_PORT         "25"                     //SMTP服务器端口
#define SIM7600CE_SMTP_USER         "example@example.com"    //SMTP用户名
#define SIM7600CE_SMTP_PASS         "password"               //SMTP密码
#define SIM7600CE_MAIL_FROM         "example@example.com"    //发件人邮箱
#define SIM7600CE_MAIL_TO           "example@example.com"    //收件人邮箱
#define SIM7600CE_MAIL_SUBJECT      "Test Email"             //邮件主题
#define SIM7600CE_MAIL_CONTENT      "This is a test email."  //邮件内容
#define SIM7600CE_MAIL_ATTACHMENT   "/test.txt"              //邮件附件

void delay(uint32_t time)
{
    while (time--);
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(UARTx_GPIO_CLK, ENABLE);

    GPIO_InitStructure.GPIO_Pin = UARTx_TX_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(UARTx_GPIO_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = UARTx_RX_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(UARTx_GPIO_PORT, &GPIO_InitStructure);
}

void USART_Configuration(void)
{
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(UARTx_CLK, ENABLE);

    USART_InitStructure.USART_BaudRate = UARTx_BAUDRATE;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(UARTx, &USART_InitStructure);
    USART_Cmd(UARTx, ENABLE);
}

void USART_SendString(char *str)
{
    while (*str != '\0') {
        while (USART_GetFlagStatus(UARTx, USART_FLAG_TC) == RESET);
        USART_SendData(UARTx, *str++);
    }
}

void USART_ReceiveString(char *str)
{
    while (1) {
        while (USART_GetFlagStatus(UARTx, USART_FLAG_RXNE) == RESET);
        char c = USART_ReceiveData(UARTx);
        *str++ = c;
        if (c == '\n') {
            *str = '\0';
            break;
        }
    }
}

int main(void)
{
    char buf[512];

    GPIO_Configuration();
    USART_Configuration();

    //等待SIM7600CE启动
    delay(0xfffff);

    //检查SIM卡是否正常
    USART_SendString("AT+CPIN?\r\n");
    USART_ReceiveString(buf);
    printf("%s", buf);

    if (strstr(buf, "READY") == NULL) {
        printf("SIM card error.\r\n");
        return -1;
    }

    //检查网络注册情况
    USART_SendString("AT+CREG?\r\n");
    USART_ReceiveString(buf);
    printf("%s", buf);

    if (strstr(buf, "+CREG: 0,1") == NULL) {
        printf("Network error.\r\n");
        return -1;
    }

    //设置SMTP服务器地址
    sprintf(buf, "AT+SMTPSRV=\"%s\"\r\n", SIM7600CE_SMTP_SERVER);
    USART_SendString(buf);
    USART_ReceiveString(buf);
    printf("%s", buf);

    //设置SMTP服务器端口
    sprintf(buf, "AT+SMTPSRVPORT=%s\r\n", SIM7600CE_SMTP_PORT);
    USART_SendString(buf);
    USART_ReceiveString(buf);
    printf("%s", buf);

    //设置SMTP用户名
    sprintf(buf, "AT+SMTPAUTH=1,\"%s\",\"%s\"\r\n", SIM7600CE_SMTP_USER, SIM7600CE_SMTP_PASS);
    USART_SendString(buf);
    USART_ReceiveString(buf);
    printf("%s", buf);

    //设置发件人邮箱地址
    sprintf(buf, "AT+SMTPFROM=\"%s\"\r\n", SIM7600CE_MAIL_FROM);
    USART_SendString(buf);
    USART_ReceiveString(buf);
    printf("%s", buf);

    //设置收件人邮箱地址
    sprintf(buf, "AT+SMTPTO=\"%s\"\r\n", SIM7600CE_MAIL_TO);
    USART_SendString(buf);
    USART_ReceiveString(buf);
    printf("%s", buf);

    //设置邮件主题
    sprintf(buf, "AT+SMTPSUB=\"%s\"\r\n", SIM7600CE_MAIL_SUBJECT);
    USART_SendString(buf);
    USART_ReceiveString(buf);
    printf("%s", buf);

    //开始邮件内容
    USART_SendString("AT+SMTPBODY\r\n");
    USART_ReceiveString(buf);
    printf("%s", buf);

    //邮件内容
    USART_SendString(SIM7600CE_MAIL_CONTENT);
    USART_SendString("\r\n");
    USART_SendString(".\r\n");   //结束邮件内容

    //添加附件
    sprintf(buf, "AT+SMTPATT=\"%s\"\r\n", SIM7600CE_MAIL_ATTACHMENT);
    USART_SendString(buf);
    USART_ReceiveString(buf);
    printf("%s", buf);

    //发送邮件
    USART_SendString("AT+SMTPSEND\r\n");
    USART_ReceiveString(buf);
    printf("%s", buf);

    //等待邮件发送结果
    while (1) {
        USART_SendString("AT+SMTPSTAT\r\n");
        USART_ReceiveString(buf);
        printf("%s", buf);
        if (strstr(buf, "+SMTPSTAT: 1") != NULL) {
            printf("Send email success.\r\n");
            break;
        }
        delay(0xfffff);
    }

    while (1);
}

需要注意的是，该代码中的SMTP服务器、端口、用户名、密码、发件人、收件人、邮件主题、邮件内容以及邮件附件都需要根据实际情况进行修改。

此外，需要在发送邮件之前先进行SIM卡检测和网络注册检测，确保SIM卡和网络处于正常状态。