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Newb fails to combine PUT and GET code samples from Gsiot book

Started by gyre, Dec 03 2013 02:12 AM

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#1 gyre

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Posted 03 December 2013 - 02:12 AM

Hi all,

I'm working through Cuno Pfister's book Getting Started with the Internet of Things. The sample codes in the book all work for me. So I decided to try to combine Example 11-1 (VoltageMonitor) and Example 12-1 (LedController): I wanted to write a program that would use different RequestRoutings via Yaler to both show me the current voltage of a potentiometer AND to allow me to turn the onboard LED on and off. Basically I inserted chunks of Example 11-1 into Example 12-1, made sure all references are intact, etc. It compiles and deploys fine, and switching the LED on and off (the PUT request) works when I access try.yaler.net/my-domain/led/target.html, but reading the voltage (the GET request) yields only a blank page when I access try.yaler.net/my-domain/voltage/actual.html.

Any ideas? I've pasted my code below (with Yaler credentials X'd out). Any help greatly appreciated. I'm very new to programming (2/10 at C#, 0/10 at JavaScript) so probably just making a simple mistake.

Thanks!!

using Gsiot.Server; using Microsoft.SPOT.Hardware; using SecretLabs.NETMF.Hardware.NetduinoPlus; public class LedControllerHtml { public static void Main() { var ledActuator = new DigitalActuator { OutputPin = Pins.ONBOARD_LED }; var lowPort = new OutputPort(Pins.GPIO_PIN_A0, false); var highPort = new OutputPort(Pins.GPIO_PIN_A2, true); var voltageSensor = new AnalogSensor { InputPin = Pins.GPIO_PIN_A1, MinValue = 0.0, MaxValue = 3.3 }; var webServer = new HttpServer { RelayDomain = "XXXXXXXX", RelaySecretKey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", RequestRouting = { { "PUT /led/target", new ManipulatedVariable { FromHttpRequest = CSharpRepresentation.TryDeserializeBool, ToActuator = ledActuator.HandlePut }.HandleRequest }, { "GET /led/target.html", HandleLedTargetHtml }, { "GET /voltage/actual.html", new MeasuredVariable { FromSensor = voltageSensor.HandleGet }.HandleRequest } } }; webServer.Run(); } static void HandleLedTargetHtml(RequestHandlerContext context) { string requestUri = context.BuildRequestUri("/led/target"); var script = @"<html> <head> <script type=""text/javascript""> var r; try { r = new XMLHttpRequest(); } catch (e) { r = new ActiveXObject('Microsoft.XMLHTTP'); } function put (content) { r.open('PUT', '" + requestUri + @"'); r.setRequestHeader('Content-Type', 'text/plain'); r.send(content); } </script> </head> <body> <p> <input type=""button"" value=""Switch LED on"" onclick=""put('true')""/> <input type=""button"" value=""Switch LED off"" onclick=""put('false')""/> <input type=""button"" value=""Bah"" onclick=""put('bah')""/> </p> </body> </html>"; context.SetResponse(script, "text/html"); } }

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#2 SeBo

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Posted 05 December 2013 - 07:37 PM

Hi gyre,

i�m new in the world of Netduino too, but for a litte project, i have to use this for controlling a power switch with a website.

For this project I use the Server from GSIOT like you.

I see in your code no html-code, which should be resonsed when the GET request "[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]"GET /voltage/actual.html" is recieved by the Netduino.[/color]

i cite a littel of my code, and i hope, you can see and it helps you to see what i mean,

First my Request handler:

static RequestRouting Routings = new RequestRouting{                    { "GET /", GetIndex },              // IP/ -> return index page            { "GET /index.*", GetIndex },       // IP/index.* -> return index page            { "GET /status.htm", GetStatus },   // IP/status.htm -> return status page            { "GET /edit.htm", GetEdit },       // IP/edit.htm -> return edit page            { "GET /links.htm", GetLinks },     // IP/links.htm -> return link page            { "GET /cprogram.htm", GetCode },   // IP/cprogram.htm -> return code of main program            { "GET /*", GetError },             // IP/* -> return error page            { "POST /edit.htm", GetEdit },      // IP/edit.htm with post data -> return edit page with modified settings            { "POST /index.*", GetIndex },      // IP/index.* with post data -> return index page with event handler            { "POST /*", GetError }             // IP/* with post data -> return error page        };            webServer.RequestRouting = Routings;

__

I use POST instate of PUT, because my Website on Netduino is only html, and the pages includes forms to send data over html.

__

If any Request is send, there will be voids to handel the events, for Index the code is:

 static void GetIndex(RequestHandlerContext context) {            try {                string[] SendSettings = context.RequestContent.Split('&'); // make a array of the post-data                foreach (string s in SendSettings) {                    switch (s.Split('=')[0]) {   // split post keyword and post value                        case "pw1": InOut.bTRIAC1 = !InOut.bTRIAC1; break; // switch a output on Netduino                        case "pw2": InOut.bTRIAC2 = !InOut.bTRIAC2; break;                        case "pw3": InOut.bTRIAC3 = !InOut.bTRIAC3; break;                        case "pw4": InOut.bTRIAC4 = !InOut.bTRIAC4; break;                        case "pw5": InOut.bTRIAC5 = !InOut.bTRIAC5; break;                        case "pw6": InOut.bTRIAC6 = !InOut.bTRIAC6; break;                        case "pw7": InOut.bTRIAC7 = !InOut.bTRIAC7; break;                        case "pw8": InOut.bTRIAC8 = !InOut.bTRIAC8; break;                    }                }            }            catch (Exception) { } // if no Post data are include like the first call of index.htm, the Exeption comes up[...] // some not nessesary code            context.SetResponse(SD_IO.ReadOut(@"htmlheader.htm") + SD_IO.ReadOut(@"htmlindex.htm") +                 sA[2] + sL[2] + returnFooter(), "text/html");  // Send HTML-Code back to Device which requestet the index page with Post or Get data.        }// and as short exampel from my code: (read just the htm-files from SD-Card and send them back to request starter.        static void GetLinks(RequestHandlerContext context) {            context.SetResponse(SD_IO.ReadOut(@"htmlheader.htm") + SD_IO.ReadOut(@"htmllinks.htm") + returnFooter(), "text/html");        }

___________________________________________________

So, in your case, i think you must change the code of from

"GET /voltage/actual.html",   new MeasuredVariable  {   FromSensor = voltageSensor.HandleGet   }.HandleRequest

to

"GET /voltage/actual.html", HandleVoltageTargetHtml

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]and add a new codeblock:[/color]

   static void HandleVoltageTargetHtml(RequestHandlerContext context){	    string requestUri = context.BuildRequestUri("voltage/actual");	    var script =		    @"<html>			    <head>"Value of Voltagesensor (Sorry, i havent used it bevor, i dont now how to handel it)                  "</body>			 </html>";	    context.SetResponse(script, "text/html");    }}

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]I hope, that this is helpfull for you. [/color]

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]Greetings[/color]

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]SeBo.[/color]

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]Ps. I know my code will not be the best, but for me it works fine [/color]