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Question by jimunwin · Aug 14, 2014 at 02:51 PM · c#requesthue

HTTP Request Issue - Lag

I heard you guys liked obscure problems ;)

I'm currently experimenting with controlling a Philips Hue bulb from Unity but I am seeing a lot of lag that I can't explain. I am using the UnityHTTP plugin and the following C# code:

 using UnityEngine;
 using System.Collections;
 using SimpleJSON;
 
 public Hashtable lightSettings = new Hashtable();
 
 void Start () {
         myUrl = "http://" + <bridge url> + "/api/newdeveloper/lights/" + <light number> + "/state"; // where am I accessing it?
     }
 
     void Update () {
         if (Input.GetKeyDown (KeyCode.X))
         {
             updateMyLight();
         }
     }
 
     public void updateMyLight() {
         updateHashtable();
         sendToLight();
     }
 
     public void sendToLight() {
         HTTP.Request theRequest = new HTTP.Request( "PUT", myUrl, lightSettings ); // build the request

         theRequest.Send(); // send the request
     }
 
 
     public void updateHashtable() {
         lightSettings.Clear();
         lightSettings.Add("transitiontime", 1);
         lightSettings.Add("bri", 100);
         lightSettings.Add("sat", 0);
         lightSettings.Add("hue", 50000); 
         lightSettings.Add("on", true); 
     }

Using this code I can change the properties of the light, however there appears to be a 1+ second delay between Unity sending the message and the light reflecting these changes. I do not see this delay when I control the bulb via Philips' own browser-based debug tool.

Unfortunately I am fairly new to both Unity and network coding. Is there something obvious I'm missing? Perhaps a series of checks Unity automatically performs?

I've been stuck for 48 hours now. Any tips would be much appreciated!

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avatar image Landern · Aug 14, 2014 at 03:01 PM 0
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Problem is, it could be the library, could be your network, proxy, firewall, server, etc. Install SmartSniff and watch the traffic from Unity and the times related to it, you may notice unity isn't the speed bump or it may be. Nothing jumps out about your code.

avatar image jimunwin · Aug 14, 2014 at 03:33 PM 0
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I know right! :) I have a lot of stuff to eli$$anonymous$$ate. However, that the light responds instantaneously to the debug tool makes me think that it isn't the network outside of my computer.

avatar image Landern · Aug 14, 2014 at 03:35 PM 0
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What happens if you don't do it in the Unity editor, but build it out as an executable and run it, could unity be adding debug hooks into calls... killing performance?

avatar image jimunwin · Aug 14, 2014 at 06:11 PM 0
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I desperately wanted that to work (it sounds so neat and plausible), but I've just tried it and alas, no difference.

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Answer by jimunwin · Aug 22, 2014 at 12:18 AM

Fixed this (with the help of a friend), it was actually some code in the UnityHTTP scripts. In the Request.cs file we quoted out the following lines:

 response = new Response ();
 response.request = this;
 state = RequestState.Reading;
 response.ReadFromStream(ostream);

and

 switch (response.status) {
 case 307:
 case 302:
 case 301:
 uri = new Uri (response.GetHeader ("Location"));
 continue;
 default:
 retry = maximumRetryCount;
 break;
 }

And now the Hue bulb responds almost immediately.

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