Use only latest data when reading value. Prevent sync errors. #4
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Data from the pulse oximeter arrives very quickly, but if it's polled infrequently, it will be out of date, and overwritten data can cause incorrect values, especially on BM1000B (newer model).
Issues found by adafruitguy in the Adafruit Forums: https://forums.adafruit.com/viewtopic.php?f=19&t=166909. Thank you!