send

MainActivity.java

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

        call.enqueue(new Callback<JsonObject>() {
            @Override
            public void onResponse(@NonNull Call<JsonObject> call, @NonNull Response<JsonObject> response) {

                JsonObject body = response.body();
                if (body != null) {
                    List<Sensor> sensors = createSensorsFromJsonObject(body);
                    adapter.updateResults(sensors);
                }
            }

            @Override
            public void onFailure(@NonNull Call<JsonObject> call, @NonNull Throwable t) {
                Log.e("LOAD_DATA", t.getLocalizedMessage());
                Toast.makeText(mContext, R.string.connection_error, Toast.LENGTH_LONG).show();
            }
        });
    }