This repository contains the code used during an handson.io tech talk aiming at demonstrating the basics of the BLE communication in Raspberry Pi using Noble
Setup your raspberry Pi Zero W with these instructions to be able to properly run the course.
Go to the root directory to run the following examples
Demonstrates the detection of the Bluetooth adapter state by noble.
Live example (in French) on Youtube here
npm run adapter-state
Open a new terminal session on the Raspberry Pi and play with the state of the adapter
$ bluetoothctl
$ power off
$ power on
$ quit
You can also use the deprecated hciconfig to configure the state of the adapter, the default bluetooth adapter is usually on hci0.
Power off:
hciconfig hci0 down
Power on :
hciconfig hci0 up
Typical console output :
adapter state : poweredOn
adapter state : poweredOff
adapter state : poweredOn
Demonstrates the scanning of the surrounding devices but also demonstrate the behaviour of some beacons which advertise their payload but change their MAC address (they use a random address type). The Estimote stickers with firmware revision 1.0.0 and 1.0.1 are used in the live demo. The MAC address of a device is a bad identifier for beacons, better to look inside the payload.
Live example (in French) on Youtube here
npm run scan
Typical console output :
c0e10a447c39 Surge -71 true random
f4e10a647c01 -55 true public
d3e10b447cd1 -67 true random
a2e10a448c37 Charge HR -49 true random
...
Demonstrates that the scanning with the duplicates allow the receiver to see the changing Received Signal Strength Indicator of the surounding devices. Measuring the RSSI as often as possible is a pre-requisite to compute the proximity of the advertising device.
npm run scan-duplicates
Demonstrates the filtering the RSSI with Kalman filters to better estimate the position of a BLE device advertising as an iBeacon (standard defined by Apple in 2013 including the calibrated RSSI @ 1 meter whitin the advertised payload).
Live example (in French) on Youtube here
npm run indoor-location