How to send a correct HTTP PUT request in Java

Question

I want to turn my lights off with Java using the Philips HUE Api. For this, I have the following API: http://192.168.0.53/api/HZ3bJqN3MIb35uNcI4FfsGcqstwbW6qgvuxd7Tmt/lights/1/

This returns:

{
  "state": {
    "on": true,
    "bri": 178,
    "hue": 41044,
    "sat": 56,
    "effect": "none",
    "xy": [
      0.3313,
      0.3447
    ],
    "ct": 181,
    "alert": "select",
    "colormode": "ct",
    "mode": "homeautomation",
    "reachable": true
  },
  "swupdate": {
    "state": "noupdates",
    "lastinstall": "2020-07-03T12:17:24"
  },
  "type": "Extended color light",
  "name": "Hue color spot 1",
  "modelid": "LCG002",
  "manufacturername": "Signify Netherlands B.V.",
  "swconfigid": "9FD98F72"
}

Now I want to modify the "on: true" to "on: false" with Java. For that, I have this code:

    URL url = new URL("http://192.168.0.53/api/HZ3bJqN3MIb35uNcI4FfsGcqstwbW6qgvuxd7Tmt/lights/1/");
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

    connection.setRequestMethod("PUT");
    connection.setDoOutput(true);
    connection.setDoInput(true);
    connection.setConnectTimeout(60000);
    connection.setReadTimeout(60000);
    connection.setRequestProperty("Content-Type", "application/json");
    JSONObject requestBody = new JSONObject();
    requestBody.put("on", false);

    OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
    writer.write(requestBody.toString());
    writer.flush();
    writer.close();

    // Debug
    int response = connection.getResponseCode();
    System.out.println(requestBody.toString());
    System.out.println(response);

This returns '200' and {"on":false} which would be perfect. But for some reason, it just does nothing. The light remains on even though the connection exists.

Any ideas why?

When you try to curl it via command line, both for on:true and on:false, what is the response code? e.g : curl -X PUT -d '{"on":true}' http://192.168.0.53/api/HZ3bJqN3MIb35uNcI4FfsGcqstwbW6qgvuxd7Tmt/lights/1/ — planben, Aug 22 '20 at 10:52
I executed the command `curl -X PUT -d '{"on":false}' 192.168.0.53/api/HZ3bJqN3MIb35uNcI4FfsGcqstwbW6qgvuxd7Tmt/lights/1/state` both in the Windows Shell and the git bash (Linux). It worked in the git bash but not in the cmd. — WhySoToxic, Aug 22 '20 at 11:20
No. I use this documentation: https://developers.meethue.com/develop/get-started-2/#findme2 And according to this, this has to work. — WhySoToxic, Aug 22 '20 at 11:49
When you say "it worked in the git bash...". What's 'git bash'? And do you mean that the lightbulb turned off? — tgdavies, Aug 23 '20 at 01:20
With git bash I mean the command shell that you get when you instal git. Its just a normal linux command shell, so the curl command would most likely work in any linux shell. Also yes, I mean the lightbulb turned off. — WhySoToxic, Aug 23 '20 at 12:03

score 1 · Accepted Answer · answered Oct 06 '20 at 20:44

1

You are using the wrong URL for the PUT request.

A GET request to http://192.168.0.53/api/.../lights/1 will return the current state

But to modify you need a PUT request to http://192.168.0.53/api/.../lights/1/state

answered Oct 06 '20 at 20:44

miknik

5,748
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score 0 · Answer 2 · edited Aug 24 '20 at 03:25

0

I am trying to do the same thing, but don't know the Java part.

I got curl to work at the command level with triple quotes:

curl -X PUT -H "Content-Type: application/json" -d {"""on""":false} http://192.168.0.53/api/HZ3bJqN3MIb35uNcI4FfsGcqstwbW6qgvuxd7Tmt/lights/1/state

This code will work with your hue lights, Please share the Java code with me when you get it to work. mike@toggle.is

edited Aug 24 '20 at 03:25

Arghya Sadhu

41,002
9
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answered Aug 24 '20 at 01:04

Mike H

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How to send a correct HTTP PUT request in Java

2 Answers2