ESP32-Ethernet-Kit_A_V1.1 WEB server

[dh_esp32]

Environment:

• Windows 10

• RT-Thread Studio 2.0.0(https://www.rt-thread.io/studio.html)

• ESP32-Ethernet-Kit_A_V1.1

Experimental steps:

The ESP32-Ethernet-Kit_A_V1.1 evaluation board has the ESP32-WROVER-B module onboard, so we chose ESP32-WROVER to create a project based on the PlatformIO with Arduino framework

Here we use RT-Thread Studio as the IDE, this IDE can easily create PlatformIO projects

• Create project

create_project.png (26.6 KiB) Viewed 1617 times

• Refer to the official ESP example, copy the following code to the main.cpp file

Code: [Select all] [Expand/Collapse]

1.    #include <WiFi.h>
2.    #include <WiFiClient.h>
3.    #include <WebServer.h>
4.    #include <ESPmDNS.h>
5.    
6.    const char* ssid = "your_wifi_ssid";
7.    const char* password = "your_wifi_passwd";
8.    
9.    WebServer server(80);
10.    
11.    const int led = 13;
12.    
13.    void handleRoot()
14.    {
15.        digitalWrite(led, 1);
16.        server.send(200, "text/plain", "hello from esp8266!");
17.        digitalWrite(led, 0);
18.    }
19.    
20.    void handleNotFound()
21.    {
22.        digitalWrite(led, 1);
23.        String message = "File Not Found\n\n";
24.        message += "URI: ";
25.        message += server.uri();
26.        message += "\nMethod: ";
27.        message += (server.method() == HTTP_GET) ? "GET" : "POST";
28.        message += "\nArguments: ";
29.        message += server.args();
30.        message += "\n";
31.        for (uint8_t i = 0; i < server.args(); i++)
32.        {
33.            message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
34.        }
35.        server.send(404, "text/plain", message);
36.        digitalWrite(led, 0);
37.    }
38.    
39.    void setup(void)
40.    {
41.        pinMode(led, OUTPUT);
42.        digitalWrite(led, 0);
43.        Serial.begin(115200);
44.        WiFi.mode(WIFI_STA);
45.        WiFi.begin(ssid, password);
46.        Serial.println("");
47.    
48.        // Wait for connection
49.        while (WiFi.status() != WL_CONNECTED)
50.        {
51.            delay(500);
52.            Serial.print(".");
53.        }
54.        Serial.println("");
55.        Serial.print("Connected to ");
56.        Serial.println(ssid);
57.        Serial.print("IP address: ");
58.        Serial.println(WiFi.localIP());
59.    
60.        if (MDNS.begin("esp32"))
61.        {
62.            Serial.println("MDNS responder started");
63.        }
64.    
65.        server.on("/", handleRoot);
66.    
67.        server.on("/inline", []()
68.        {
69.            server.send(200, "text/plain", "this works as well");
70.        });
71.    
72.        server.onNotFound(handleNotFound);
73.    
74.        server.begin();
75.        Serial.println("HTTP server started");
76.    }
77.    
78.    void loop(void)
79.    {
80.        server.handleClient();
81.    }

GeSHi © Codebox Plus Extension

[/code]


In this code, a web server is started and monitored on port 80, and the following routing processing is performed on the received http request:

The request for "ip:80/" is received, processed by the handleRoot function, and the http status code 200 is returned, and the peaceful text string "hello from esp8266!"

Code: [Select all] [Expand/Collapse]

1.      void handleRoot()
2.      {
3.          digitalWrite(led, 1);
4.          server.send(200, "text/plain", "hello from esp8266!");
5.          digitalWrite(led, 0);
6.      }

GeSHi © Codebox Plus Extension

Receive a request for "ip:80/inline", return a 200 status code and the text "this works as well"

Code: [Select all] [Expand/Collapse]

1.      server.on("/inline", []()
2.                {
3.                    server.send(200, "text/plain", "this works as well");
4.                });

GeSHi © Codebox Plus Extension

Other resource requests are received, processed by handleNotFound, and 404 is returned

Code: [Select all] [Expand/Collapse]

1.      void handleNotFound()
2.      {
3.          digitalWrite(led, 1);
4.          String message = "File Not Found\n\n";
5.          message += "URI: ";
6.          message += server.uri();
7.          message += "\nMethod: ";
8.          message += (server.method() == HTTP_GET) ? "GET" : "POST";
9.          message += "\nArguments: ";
10.          message += server.args();
11.          message += "\n";
12.          for (uint8_t i = 0; i < server.args(); i++)
13.          {
14.              message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
15.          }
16.          server.send(404, "text/plain", message);
17.          digitalWrite(led, 0);
18.      }

GeSHi © Codebox Plus Extension

• Modify the wifi account and password to the wifi configuration of your environment hotspot, so that the module can connect to the hotspot

Code: [Select all] [Expand/Collapse]

1.    const char* ssid = "your_wifi_ssid";
2.    const char* password = "your_wifi_passwd";

GeSHi © Codebox Plus Extension

• Click the small hammer icon in the upper left corner of the IDE to compile the entire project

• Connect the micro-usb cable and click the download button to download the program to the evaluation board

• After the download is complete, connect to the serial terminal, you can see that the module has been successfully started, the information is as follows

esp32_ip.png (28.09 KiB) Viewed 1617 times

• Open chrome and visit http://172.30.200.121/, http://172.30.200.121/inline http://172.30.200.121/xxx to get the response of the ESP web server to different resources

http://172.30.200.121/

index.png (7.08 KiB) Viewed 1617 times