uum-iot-lab/web-server-esp32/web-server-without-style

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web-server-without-style

@/web-server-without-style

INETjesuso/esp32-wifi/esp32-inet

CONNpulse

Establish the connection

TITLEstring

HTML Title

OPstring

Operation to be done on the web server

STYLEstring

HTML code to style the web server

RUNpulse

DONEpulse

Pulse when new client is detected

IPxod/net/ip-address

IP address for the web server

To use the node in your project you should have the uum-iot-lab/web-server-esp32 library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.

#pragma XOD require "https://github.com/espressif/arduino-esp32"

#pragma XOD error_raise enable

#include <WiFi.h>
#include <WiFiServer.h>

WiFiServer wifiServer(80);

node {
    String request = "";
    void evaluate(Context ctx) {
        if (isInputDirty<input_CONN>(ctx)) {
            wifiServer.begin();

            auto ip = WiFi.localIP();
            emitValue<output_IP>(ctx, ip);
        }

        if (isInputDirty<input_RUN>(ctx)) {
            WiFiClient client = wifiServer.available();
            if(!client)
                return;

            boolean currentLineIsBlank = true;
            while (client.connected())
            {
                if(client.available())
                {
                  char c = client.read();
                  request += c;
                  Serial.write(c);
                  if (c == '\n' && currentLineIsBlank)
                  {
                    client.println("HTTP/1.1 200 OK");
                    client.println("Content-Type: text/html");
                    client.println("Connection: close");
                    client.println();

                    client.println("<!DOCTYPE HTML>");
                    client.println("<html>");

                    client.println("<head>");
                    client.println("<title>");

                    auto title = getValue<input_TITLE>(ctx);
                    char _title[length(title) + 1] = { 0 };
                    dump(title, _title);
                    client.println(_title);

                    delay(2000);

                    client.println("</title>");
                    client.println("<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
                    client.println("<link rel=\"icon\" href=\"data:,\">");

                    auto style = getValue<input_STYLE>(ctx);
                    char _style[length(style) + 1] = { 0 };
                    dump(style, _style);
                    client.println(_style);
                    delay(2000);

                    client.println("</head>");

                    client.println("<body>");
                    client.println("<div id=\"operation\">");

                    auto op = getValue<input_OP>(ctx);
                    char _op[length(op) + 1] = { 0 };
                    dump(op, _op);
                    client.println(_op);

                    client.println("</div>");

                    client.println("</body>");

                    client.println("</html>");

                    break;
                  }
                  if(c == '\n')
                  {
                    currentLineIsBlank = true;
                  }
                  else if(c != '\r')
                  {
                    currentLineIsBlank = false;
                  }
                }
              }
        }

        emitValue<output_DONE>(ctx, 1);

    }
}

web-server-without-style

uum-iot-lab/web-server-esp32/web-server-without-style

C++ implementation