Instance method of TerraManager
Requires a connection with FREESTYLE_LIBRE
Requires Near Field Communication Tag Capability
Currently only Libre 1, Pro/H and Libre 2 (UK) are supported!
Libre 2 US and Libre14Days US are not supported currently.
func readGlucoseData(completion: @escaping (FSLSensorDetails?))
completion: (FSLSensorDetails?) ➡ completion function with the data as its parameter