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怎样用ESP32创建一个Web服务器 并将其连接到Wi-Fi获取IP地址

2019-07-26 09:15:00

入门

客户端与客户端之间的连接webserver是使用HTTP协议建立的。 HTTP协议如下所示:HTTP/1.1 200 OK r nContent-Type:text/html r n r n“。

”HTTP/1.1 200 OK“表示服务器已接受请求并已回复“200 OK”,这是状态代码,后跟“ r n”,这是HTTP协议的约束。

“Content-Type:text/html r n“表示响应内容类型为HTML格式,后跟” r n“

在HTTP协议结束时,网络服务器将返回显示”Hello world“的网页。

代码

#include

const char* wifi_name = “Tenda_31BC98”; //Your Wifi name

const char* wifi_pass = “barcelona”; //Your Wifi password

WiFiServer server(80); //Port 80

void setup()

{

Serial.begin(115200);

// Let‘s connect to wifi network

Serial.print(“Connecting to ”);

Serial.print(wifi_name);

WiFi.begin(wifi_name, wifi_pass); //Connecting to wifi network

while (WiFi.status() != WL_CONNECTED) { //Waiting for the responce of wifi network

delay(500);

Serial.print(“。”);

}

Serial.println(“”);

Serial.println(“Connection Successful”);

Serial.print(“IP address: ”);

Serial.println(WiFi.localIP()); //Getting the IP address at which our webserver will be created

Serial.println(“Put the above IP address into a browser search bar”);

server.begin(); //Starting the server

}

void loop()

{

WiFiClient client = server.available(); //Checking for incoming clients

if (client)

{

Serial.println(“new client”);

String currentLine = “”; //Storing the incoming data in the string

while (client.connected())

{

if (client.available()) //if there is some client data available

{

char c = client.read(); //read a byte

Serial.print(c);

if (c == ’ ‘) //check for newline character,

{

if (currentLine.length() == 0) //if line is blank it means its the end of the client HTTP request

{

client.print(“”);

client.print(“

Hello World

”);

break; //Going out of the while loop

}

else

{

currentLine = “”; //if you got a newline, then clear currentLine

}

}

else if (c != ’ ‘)

{

currentLine += c; //if you got anything else but a carriage return character,

}

}

}

}

delay(2000);

}

代码说明

首先,我们加入了Wi-Fi库,它将帮助我们创建网络服务器。然后我们存储了Wi-Fi名称和密码,以便我们可以连接到这个Wi-Fi网络。之后,我们定义了我们要将数据发送到的端口。

const char* wifi_name = “Tenda_31BC98”; //Your Wifi name

const char* wifi_pass = “barcelona”; //Your Wifi password

WiFiServer server(80); //Port 80

在setu中p功能,我们使用上面提供的Wi-Fi信息将ESP32连接到我们的Wi-Fi网络。如果与Wi-Fi网络的连接成功,则“连接成功”将显示在串行监视器上。否则,它将继续尝试,直到它将连接到Wi-Fi网络。

Serial.print(“Connecting to ”);

Serial.print(wifi_name);

WiFi.begin(wifi_name, wifi_pass); //Connecting to wifi network

while (WiFi.status() != WL_CONNECTED) { //Waiting for the responce of wifi network

delay(500);

Serial.print(“。”);

}

Serial.println(“”);

Serial.println(“Connection Successful”);

以下命令将获取IP地址,我们将在串行监视器上显示它。

Serial.println(WiFi.localIP());

然后我们启动了服务器,以便我们可以获取数据并将数据发送到浏览器。

server.begin( );

在循环函数中,我们检查了是否有客户端发送了http请求。如果有任何客户端请求可用,它将存储在字符中并显示在串行监视器上。在请求结束时,我们将发送HTML命令,它将在网页上打印“Hello world”。

WiFiClient client = server.available(); //Checking for incoming clients

if (client)

{

Serial.println(“new client”);

String currentLine = “”; //Storing the incoming data in the string

while (client.connected())

{

if (client.available()) //if there is some client data available

{

char c = client.read(); //read a byte

Serial.print(c);

if (c == ’ ‘) //check for newline character,

{

if (currentLine.length() == 0) //if line is blank it means it’s the end of the client HTTP request

{

client.print(“

”);

client.print(“

Hello World

”);

break; //Going out of the while loop

}

如何运行代码

使用您的Wi-Fi名称和密码更改代码中的Wi-Fi名称和密码。然后上传代码并打开串行监视器。串行监视器将显示IP地址,如下图所示。在浏览器中输入此IP地址。

输入IP地址后,网页将如下所示。

地址服务器客户端协议

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