可以帮我写一个关于stm32f103c8t6和esp8266WiFi模块与手机APP链接的代码吗

好的，下面是一个简单的示例代码，可以实现STM32F103C8T6和ESP8266 WiFi模块通过WiFi与手机APP进行通信。

首先需要使用STM32F103C8T6的UART串口与ESP8266模块进行通信。以下为STM32F103C8T6与ESP8266模块的连接方式：

| STM32F103C8T6 | ESP8266 |
| ------------- | ------- |
| PA9 (TX) | RX |
| PA10 (RX) | TX |
| GND | GND |
| 3.3V | VCC |
| PB0 | RST |

接下来需要在STM32F103C8T6中编写代码实现连接WiFi并进行通信。以下为示例代码：

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

#define WIFI_SSID "WiFi名称"
#define WIFI_PASSWORD "WiFi密码"

void USART1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;
    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_Tx | USART_Mode_Rx;
    USART_Init(USART1, &USART_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

    USART_Cmd(USART1, ENABLE);
}

void USART1_IRQHandler(void)
{
    if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
    {
        USART_ClearITPendingBit(USART1, USART_IT_RXNE);

        char data = USART_ReceiveData(USART1);
        USART_SendData(USART1, data);
    }
}

void ESP8266_SendCommand(char *command, char *response, uint32_t timeout)
{
    char buffer[100];
    char *found;

    memset(buffer, 0, sizeof(buffer));
    USART_SendData(USART1, '\r');
    delay_us(100);
    USART_SendData(USART1, '\n');
    delay_us(100);
    USART_SendData(USART1, '\r');
    delay_us(100);
    USART_SendData(USART1, '\n');
    delay_us(100);
    USART_SendData(USART1, command);
    delay_us(100);
    USART_SendData(USART1, '\r');
    delay_us(100);
    USART_SendData(USART1, '\n');
    delay_us(100);

    uint32_t startTime = HAL_GetTick();
    while ((HAL_GetTick() - startTime) < timeout)
    {
        if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
        {
            USART_ClearITPendingBit(USART1, USART_IT_RXNE);

            char data = USART_ReceiveData(USART1);
            strncat(buffer, &data, 1);

            found = strstr(buffer, response);
            if (found != NULL)
            {
                return;
            }
        }
    }
}

void ESP8266_Init(void)
{
    ESP8266_SendCommand("AT+RST", "ready", 3000);
    ESP8266_SendCommand("AT+CWMODE=1", "OK", 1000);
    ESP8266_SendCommand("AT+CWJAP=\"" WIFI_SSID "\",\"" WIFI_PASSWORD "\"", "OK", 10000);
}

void ESP8266_SendData(char *data)
{
    char command[100];

    sprintf(command, "AT+CIPSEND=%d", strlen(data));
    ESP8266_SendCommand(command, ">", 1000);

    ESP8266_SendCommand(data, "SEND OK", 1000);
}

int main()
{
    USART1_Init();
    ESP8266_Init();

    while (1)
    {
        ESP8266_SendData("Hello World!");
        delay_ms(5000);
    }
}

以上代码中，ESP8266_SendCommand()函数用于发送AT指令并接收ESP8266模块的应答。ESP8266_Init()函数用于初始化ESP8266模块并连接WiFi网络。ESP8266_SendData()函数用于发送数据到手机APP。

其中，需要将WIFI_SSID和WIFI_PASSWORD分别替换为你的WiFi名称和密码。

最后，需要在手机APP中使用TCP/IP协议与ESP8266模块进行通信。具体实现方式可以参考以下链接：

[使用TCP/IP协议与ESP8266模块进行通信](https://blog.csdn.net/weixin_43742700/article/details/104198283)