Bluetooth specifications define a Date Time GATT characteristic... but I couldn't find a GATT service to which it is related. Did I miss something in the GATT specifications ? Would there be something like characteristics that could be used by all services ?
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1 Answers
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There is definitely not a "super-characteristic" that could be used by all services. Also, there is, at least to my knowledge, no service that would implement this characteristic directly. It seems to be simply a type definition.
For example, take the Continuous Glucose Monitoring Service and its characteristic Session Start Time: The value field "Session Start Time" is of type org.bluetooth.characteristic.date_time.
Interestingly, on the Nordic homepage, it is listed as a Bluetooth Service. But there they also only describe it as "Definition of ble_date_time_t type" without any functionality.
