DeviceExpert Java REST API

Hey there,

I'm trying to connect to the DeviceExpert with the REST API inside of a java application.

My problem is that I'm getting an empty result returned and not a json object as it should be, but the connection responseCode is 200, so that should not be the problem.

Do I have to authenticate somehow before I can make the api call? Or is the generated api key enough?

Any help would be greatly appreciated.

The urlParameters look like for example:

"API_KEY="+apiKey+"&ACTION=GET_ALL_DEVICE_TYPES"

And this is the function I use:

private JSONObject sendPostRequest(String urlParameters, boolean debug) throws Exception
    {
        String request = "http://"+serverIp+":"+serverPort+"/api";

        URL url = new URL(request);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();

        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setInstanceFollowRedirects(true);

        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        connection.setRequestProperty("charset", "utf-8");
        connection.setRequestProperty("Content-Length", "" + Integer.toString(urlParameters.getBytes().length));
        connection.setUseCaches (false);

        DataOutputStream wr = new DataOutputStream(connection.getOutputStream ());
        wr.writeBytes(urlParameters);
        wr.flush();
        wr.close();

        if(debug)
        {
            int responseCode = connection.getResponseCode();
            CSCLog4Jv2.info("Sending request to URL : " + url);
            CSCLog4Jv2.info("Response Code : " + responseCode);
        }

        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null)
            response.append(inputLine);
        in.close();

        connection.disconnect();

        CSCLog4Jv2.info("Response: "+response.toString());

        return null;
        //return new JSONObject(response.toString()).getJSONObject("response");
        //return new JSONObject(response.toString());
    }