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# Covid Bracelet, compatibile with Covid Apps on iOS and Android
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**Contributions Welcome!**
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## Features
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* Sends and receives exposure beacons as specified by Google and Apple for Covid Contact Tracing
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* Rolling, encrypted, anonymous beacons
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* Compatible with Apple iOS and Android phones
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* 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
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* Upon infection upload keys to a public database
* Retrieve keys of infections from database
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* computes rolling proximity identifiers
* compares to stored contacts to check for exposure
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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.
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## Get Started:
This project is based on platformIO, see: [https://platformio.org/platformio-ide ](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
```
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**Note: this is a proof of concept and not ready for production**
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## Demo Video
[](https://youtu.be/tYGsFJC3LtE)
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## Open / Possible next steps
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* firmware of the air updates (signed): done in testing
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* fix entropy: keys are always the same on boot up
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* time sync
* set device name, user id or so in Flash
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* 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
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* set transmit power and store this in the corona beacons
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* 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
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* Energy efficiency
* BLE advertisements sets
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* Secure GATT services and authentication of base statation in general
* More platforms: with display etc.
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## TODOs Wristband
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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
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## TODOs App and Basestation
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* extend this beyond the simple basestation
* read keys form national databases
