I'm developing a keyless entry/start system for vehicles with the following requirements:
-
The vehicle side uses an nRF54L15, while the mobile phone is a standard smartphone (e.g., Android 16+).
-
The phone acts as the Bluetooth Central, and the vehicle side acts as the Peripheral, initiating advertising. The phone actively establishes a connection when it approaches the vehicle.
-
After the connection is established, the vehicle side actively initiates the Channel Sounding ranging process and locally obtains distance data from the phone to determine whether to unlock the vehicle.
My core question is:
-
Is a mobile app absolutely necessary? I want the nRF54L15 to handle distance measurement and unlocking decisions on its own, without any app intervention on the phone. I've seen Nordic's example where the phone acts as the initiator, but since the Android system itself can handle the ranging calculations, and the app merely retrieves the results via APIs, does this mean no app is needed? Can the Android system handle GATT-layer data interactions independently?
