Brings up the NFC Scanning screen to activate freestylelibre sensors

Instance method of TerraManager
Requires a connection with FREESTYLE_LIBRE
Requires Near Field Communication Tag Capability
Always check the sensor state with readGlucoseData first before trying to activate!


Currently only Libre 1, Pro/H and Libre 2 (UK) are supported!

Libre 2 US and Libre14Days US are not supported currently.

func activateSensor(completion: @escaping (FSLSensorDetails?) -> Void)

completion: (FSLSensorDetails?) ➡ completion function with the data as its parameter