Using a webserver running before KNX Library #39

ascillato · 2018-03-09T07:12:41Z

Hi,

To test the option of using a webserver that is already running, I modify one of the webserver examples of Arduino IDE.

First of all, it is very important to pass to the KNX Library, the already running webserver, as a pointer, so:

If in your program, the server is defined like:

ESP8266WebServer server ( 80 );

you have to use:

knx.start(&server);

If in your program, the server is defined like:

ESP8266WebServer *server;
server = new ESP8266WebServer ( 80 );

you have to use:

knx.start(server);

And also to modify the esp-knx-ip.h to have #define ROOT_PREFIX "/knx"

Following is a working example of that.

@envy, can be added the ROOT_PREFIX directly to knx.start(&server)?
To be something like knx.start(&server, "/knx");

Will be very handy that, and also there is no need of modifying the library to use this feature.

What do you think?

Example:

/*
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 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 *
 * * Neither the name of Majenko Technologies nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>

#include <esp-knx-ip.h>            // KNX Library
#define KNX_ROOT_PAGE    "/knx"    // KNX Root page. On web browser put <ip>/knx, where <ip> is the IP of the device. You can see the IP from the serial console.

const char *ssid = "SSID";
const char *password = "PASS";

ESP8266WebServer server ( 80 );

const int led = 13;

void handleRoot() {
	digitalWrite ( led, 1 );
	char temp[400];
	int sec = millis() / 1000;
	int min = sec / 60;
	int hr = min / 60;

	snprintf ( temp, 400,

"<html>\
  <head>\
    <meta http-equiv='refresh' content='5'/>\
    <title>ESP8266 Demo</title>\
    <style>\
      body { background-color: #cccccc; font-family: Arial, Helvetica, Sans-Serif; Color: #000088; }\
    </style>\
  </head>\
  <body><center>\
    <h1>Hello from ESP8266!</h1>\
    <p>Uptime: %02d:%02d:%02d</p>\
    <img src=\"/test.svg\" />\
    <br>\
    <p><a href='" KNX_ROOT_PAGE "'>KNX</a></p></center>\
  </body>\
</html>",

		hr, min % 60, sec % 60
	);
	server.send ( 200, "text/html", temp );
	digitalWrite ( led, 0 );
}

void handleNotFound() {
	digitalWrite ( led, 1 );
	String message = "File Not Found\n\n";
	message += "URI: ";
	message += server.uri();
	message += "\nMethod: ";
	message += ( server.method() == HTTP_GET ) ? "GET" : "POST";
	message += "\nArguments: ";
	message += server.args();
	message += "\n";

	for ( uint8_t i = 0; i < server.args(); i++ ) {
		message += " " + server.argName ( i ) + ": " + server.arg ( i ) + "\n";
	}

	server.send ( 404, "text/plain", message );
	digitalWrite ( led, 0 );
}

void setup ( void ) {
	pinMode ( led, OUTPUT );
	digitalWrite ( led, 0 );
	Serial.begin ( 115200 );
	WiFi.mode ( WIFI_STA );
	WiFi.begin ( ssid, password );
	Serial.println ( "" );

	// Wait for connection
	while ( WiFi.status() != WL_CONNECTED ) {
		delay ( 500 );
		Serial.print ( "." );
	}

	Serial.println ( "" );
	Serial.print ( "Connected to " );
	Serial.println ( ssid );
	Serial.print ( "IP address: " );
	Serial.println ( WiFi.localIP() );

	if ( MDNS.begin ( "esp8266" ) ) {
		Serial.println ( "MDNS responder started" );
	}

	server.on ( "/", handleRoot );
	server.on ( "/test.svg", drawGraph );
	server.on ( "/inline", []() {
		server.send ( 200, "text/plain", "this works as well" );
	} );
	server.onNotFound ( handleNotFound );
	server.begin();
	Serial.println ( "HTTP server started" );

   // Set physical address (1.1.1)
  knx.physical_address_set(knx.PA_to_address(1, 1, 1));
  knx.start(&server);
  //knx.start(&server, KNX_ROOT_PAGE);
}

void loop ( void ) {
	server.handleClient();
  knx.loop();
}

void drawGraph() {
	String out = "";
	char temp[100];
	out += "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"400\" height=\"150\">\n";
 	out += "<rect width=\"400\" height=\"150\" fill=\"rgb(250, 230, 210)\" stroke-width=\"1\" stroke=\"rgb(0, 0, 0)\" />\n";
 	out += "<g stroke=\"black\">\n";
 	int y = rand() % 130;
 	for (int x = 10; x < 390; x+= 10) {
 		int y2 = rand() % 130;
 		sprintf(temp, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke-width=\"1\" />\n", x, 140 - y, x + 10, 140 - y2);
 		out += temp;
 		y = y2;
 	}
	out += "</g>\n</svg>\n";

	server.send ( 200, "image/svg+xml", out);
}

The text was updated successfully, but these errors were encountered:

ascillato · 2018-04-01T14:37:56Z

I think this explanation of how using the KNX.start when having an already running webserver should be on the wiki or in an example.

ascillato closed this as completed Jun 12, 2018

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Using a webserver running before KNX Library #39

Using a webserver running before KNX Library #39

ascillato commented Mar 9, 2018 •

edited

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ascillato commented Apr 1, 2018

Using a webserver running before KNX Library #39

Using a webserver running before KNX Library #39

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ascillato commented Mar 9, 2018 • edited Loading

ascillato commented Apr 1, 2018

ascillato commented Mar 9, 2018 •

edited

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