MainActivity.java

    private void sendQueryForData() {
        final Context mContext = this;
        WeatherService weatherService = WeatherService.retrofit.create(WeatherService.class);
        final Call<List<Sensor>> call = weatherService.loadData();

        call.enqueue(new Callback<List<Sensor>>() {
            @Override
            public void onResponse(@NonNull Call<List<Sensor>> call, @NonNull Response<List<Sensor>> response) {
                List<Sensor> sensors = response.body();

                if (sensors != null) {
                    Timber.i("Server response with: %s", sensors);

                    adapter.updateResults(sensors);
                    notificationService.checkSensorsState(sensors, mContext);
                }
                swipeRefreshLayout.setRefreshing(false);
            }

            @Override
            public void onFailure(@NonNull Call<List<Sensor>> call, @NonNull Throwable t) {
                swipeRefreshLayout.setRefreshing(false);
                Timber.e(t.getLocalizedMessage());
                Toast.makeText(mContext, R.string.connection_error, Toast.LENGTH_LONG).show();
            }
        });
    }