Working with Bluetooth & NFC

About 10 meters for Bluetooth, and about 4 centimeters for NFC (Near Field Communication). That difference in range explains what each technology is for. Bluetooth suits an ongoing connection to a device across the room, such as a fitness tracker or a barcode scanner. NFC suits a deliberate tap, such as holding a phone against a tag on a parcel locker.

The courier app needs both: it reads the battery level of a Bluetooth parcel scanner, and it reads and writes small NFC tags