'Retrieve Blood Glucose Data using Google Fit HistoryAPI

I'm trying to retrieve Blood Glucose Data using the Google Fit HistoryAPI. I used the HistoryAPI example for getting the step count (https://github.com/googlearchive/android-fit/tree/master/BasicHistoryApi) and tried to modify it so that I get blood glucose data instead of the step count.

I changed the fitnessOptions to:

 FitnessOptions fitnessOptions =
                FitnessOptions.builder()
                    .addDataType(DataType.TYPE_STEP_COUNT_DELTA, FitnessOptions.ACCESS_WRITE)
                    .addDataType(DataType.AGGREGATE_STEP_COUNT_DELTA, FitnessOptions.ACCESS_WRITE)
                    .addDataType(TYPE_BLOOD_GLUCOSE, FitnessOptions.ACCESS_READ)
                    .addDataType(AGGREGATE_BLOOD_GLUCOSE_SUMMARY, FitnessOptions.ACCESS_READ)
                    .build();

and the readRequest looks like this:

DataReadRequest readRequest =
                new DataReadRequest.Builder()
                .setTimeRange(startTime, endTime, TimeUnit.MILLISECONDS)
                .aggregate(TYPE_BLOOD_GLUCOSE, AGGREGATE_BLOOD_GLUCOSE_SUMMARY)
                .bucketByTime(1, TimeUnit.DAYS)
                .build();

The step counter example works fine but I always get an empty dataset without any data points when I try to retrieve blood glucose data. What could be the problem here?

android google-fit

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'Retrieve Blood Glucose Data using Google Fit HistoryAPI

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