Trying to wrap connect()

FotoAppSDK.java

    private void init(JSONArray args) throws JSONException{
        // args contains the arguments for initialization. these must be unwrapped.
        for (int i=0; i==5; i++) {
            if (args.getString(i) == null || args.getString(i).length() <= 0) {
              callbackContext.error(TAG + ": initialization failed. Are you passing the correct parameters?");
            }
        }

        // Get arguments passed in
        // Endpoints are a bit special, since they come as an array and have
        // to be passed on as String[]
        JSONArray endpointUrlsArray = new JSONArray(args.getString(0));
        String[] endpointUrls = new String[endpointUrlsArray.length()];
        for(int i = 0; i < endpointUrlsArray.length(); i++){
            endpointUrls[i] = endpointUrlsArray.getString(i);
        }
        String apiKey = args.getString(1);
        String appVersion = args.getString(2);
        String iknr = args.getString(3);
        String baseWebserviceUrl = args.getString(4);
        String apnsToken = args.getString(5);

        PhotoSdkParameters parameters = new PhotoSdkParameters();
        parameters.setEndpointURLs(endpointUrls);
        parameters.setApiKey(apiKey);
        parameters.setAppVersion(appVersion);
        parameters.setIKNR(iknr);
        parameters.setBaseWebserviceUrl(baseWebserviceUrl);
        parameters.setAPNSToken(apnsToken);


        PhotoSDK.getInstance().init(this.application, parameters);
        callbackContext.success(TAG + ": successfully initialized FotoApp SDK");
    }

    private void connect(){
      // neither one of the callbacks is called (success or error). The console log only output "JSON error"
      PhotoSDK.getInstance().connect(new MqttConnectCallback() {
        @Override
        public void onSuccess(Response<String> response) {
          callbackContext.success(TAG + ": successfully connected FotoApp SDK");
        }

        @Override
        public void onFailure(BluePostBoxError bluePostBoxError) {
          AppErrorManager.getInstance().processErrorCode(activity, bluePostBoxError);
          callbackContext.error(TAG + ": couldn't connect FotoApp SDK");
        }
      });
    }