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Covid Bracelet, compatibile with Covid Apps on iOS and Android

Contributions Welcome!

Features

Sends and receives exposure beacons as specified by Google and Apple for Covid Contact Tracing
Rolling, encrypted, anonymous beacons
Compatible with Apple iOS and Android phones
With rolling proximity identifiers and encrypted metadata
Proximity identifiers and BLE addresses change every 10 minutes
Stores own keys for 14 days
Stores contacts of more than 5 minute duration
Upon infection upload keys to a public database
Retrieve keys of infections from database
- computes rolling proximity identifiers
- compares to stored contacts to check for exposure

Builds on on Zephyr OS and NRF52 BLE SOCs. Note: as we for now do not use the flash for key storage, this currently only works on nrf52480 or you can just store a very small number of keys. Moving the keys to flash is on the TODO list and will fix this.

Get Started:

This project is based on platformIO, see: https://platformio.org/platformio-ide

Testing

To run the tests for the desktop environment select the test task for desktop or run:

platformio test -e desktop

Note: this is a proof of concept and not ready for production

Demo Video

Open / Possible next steps

firmware of the air updates (signed): done in testing
fix entropy: keys are always the same on boot up
time sync
set device name, user id or so in Flash
set scanning interval to the correct value, for now we just use the default
set advertisement interval, correct value, for now we just use the default: should be 200-270 milliseconds
store long-term contacts in flash
set transmit power and store this in the corona beacons
get infections from DB, check their signatures
extensive logging: crash, reboot, battery level, charging state, contacts, memory useage, flash usage,
extensive compatibility testing with Apple iOS and Android devices
contininous integration testing
Energy efficiency
BLE advertisements sets
Secure GATT services and authentication of base statation in general
More platforms: with display etc.

TODOs Wristband

Possible platforms for real-world deployment many, as many of the cheap fitness trackers base on NRF52 or chips with similar capabilities. However, many would need the firmware to be shipped to manufactures.

Watch UI
Pine Time could be good for testing

TODOs App and Basestation

extend this beyond the simple basestation
read keys form national databases

2.6 KiB Raw Blame History