写一个基于STM32F103C8T6与ESP8266通过USART2串口连接，STM32F103C8T6发送AT指令给ESP8266连接服务器或发送数据程序和服务器ESP8266发送数据给STM32F103C8T6

好的，我明白了。以下是基于STM32F103C8T6与ESP8266通过USART2串口连接，STM32F103C8T6发送AT指令给ESP8266连接服务器或发送数据程序和服务器ESP8266发送数据给STM32F103C8T6的参考代码：

STM32F103C8T6发送AT指令给ESP8266连接服务器或发送数据程序：

#include "stm32f10x.h"

void USART2_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  USART_InitTypeDef USART_InitStruct;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStruct);

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStruct);

  USART_InitStruct.USART_BaudRate = 9600;
  USART_InitStruct.USART_WordLength = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits = USART_StopBits_1;
  USART_InitStruct.USART_Parity = USART_Parity_No;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
  USART_Init(USART2, &USART_InitStruct);

  USART_Cmd(USART2, ENABLE);
}

char USART2_receive_char(){
  while (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET);
  return USART_ReceiveData(USART2);
}

void USART2_send_char(char c){
  while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
  USART_SendData(USART2, c);
}

void USART2_send_string(char *str){
  int i = 0;
  while (str[i]){
    USART2_send_char(str[i]);
    i++;
  }
}

int main(void)
{
  USART2_Config(); // 配置USART2串口

  USART2_send_string("AT+CWJAP=\"SSID\",\"PASSWORD\"\r\n"); // 连接WiFi
  delay_ms(2000); // 延时2秒

  USART2_send_string("AT+CIPSTART=\"TCP\",\"IP\",PORT\r\n"); // 连接服务器
  delay_ms(2000); // 延时2秒

  USART2_send_string("AT+CIPSEND=6\r\n"); // 发送数据前设置数据长度为6
  USART2_send_string("Hello\r\n"); // 发送数据
  delay_ms(2000); // 延时2秒

  while(1);
}

ESP8266发送数据给STM32F103C8T6程序：

#include "stm32f10x.h"

void USART2_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  USART_InitTypeDef USART_InitStruct;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStruct);

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStruct);

  USART_InitStruct.USART_BaudRate = 9600;
  USART_InitStruct.USART_WordLength = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits = USART_StopBits_1;
  USART_InitStruct.USART_Parity = USART_Parity_No;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
  USART_Init(USART2, &USART_InitStruct);

  USART_Cmd(USART2, ENABLE);
}

char USART2_receive_char(){
  while (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET);
  return USART_ReceiveData(USART2);
}

void USART2_send_char(char c){
  while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
  USART_SendData(USART2, c);
}

void USART2_send_string(char *str){
  int i = 0;
  while (str[i]){
    USART2_send_char(str[i]);
    i++;
  }
}

int main(void)
{
  USART2_Config(); // 配置USART2串口

  while(1)
  {
    if (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) != RESET) // 接收到数据
    {
      char receive_data = USART_ReceiveData(USART2);

      if (receive_data == '\n') // 数据接收完毕
      {
        USART2_send_string("Received data: "); // 回复数据接收成功
        USART2_send_string(received_data);
        USART2_send_string("\r\n");

        received_data = ""; // 清空接收到的数据
      }
      else
      {
        received_data += receive_data; // 继续接收数据
      }
    }
  }
}