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