ito library for React Native apps

What it does

This library is the native backend for the ito app. It does several things

generate TCNs (Temporary Contact Numbers) as per the STRICT protocol
handle bluetooth communication
store the data received over bluetooth
store the data used to generate the TCNs
regularly poll the server for TCN reports and compare with the local database
upload TCN generation data from specified timeframes
provide some feedback for better UX

Getting started

$ npm install https://github.com/ito-org/react-native-ito --save

Mostly automatic installation

$ react-native link react-native-ito

Usage

Retrieve the native module.

import {NativeModules, NativeEventEmitter} from 'react-native';

const { ItoBluetooth } = NativeModules;

Start tracing (after getting location permission for Bluetooth advertising and scanning):

ItoBluetooth.restartTracing();

Get the current and recent distances of ito devices in the vicinity.

const eventEmitter = new NativeEventEmitter(ItoBluetooth);
this.eventListener = eventEmitter.addListener('onDistancesChanged', (distances) => {
  //get notified about the distances to nearby devices
});

Find out whether the user is likely to have been in contact with an infected user

ItoBluetooth.isPossiblyInfected() // boolean

Upload the user's own TCNs of the last 7 days

const nowSeconds = Date.now() / 1000;
const sevenDaysAgo = nowSeconds - 7 * 24 * 60 * 60;
ItoBluetooth.publishBeaconUUIDs(
  sevenDaysAgo,
  now,
  (success) => {
    console.log('upload ' + success ? 'succeeded' : 'failed');
  },
)