shaunmulligan/react-native-cycling-sensors

A React Native package for BLE cycling sensors.

react-native-cycling-sensors

A RN package for BLE cycling sensors.

Currently only supports:

• Heart Rate
• Cycling Power Measurement
• Cycling Power Vector
• Cycling Speed and Cadence

Tested with Garmin Forerunner 945 (HR broadcast), Garmin HRM Pro for Heart Rate and Tacx Neo 2T and Favero Assioma duo for Power and Cadence measurements.

Installation

npm install react-native-cycling-sensors

Usage

import React, { useEffect } from 'react';
import { Button, SafeAreaView, StyleSheet, Text, View } from 'react-native';
import { BleSensors, PowerMeter } from 'react-native-cycling-sensors';

const App = () => {
  const sleep = (ms: number) => new Promise((r) => setTimeout(r, ms));

  const handleDiscoverPeripheral = (peripheral: any) => {
    console.log(peripheral);
  };

  const handlePowerData = (data: any) => {
    console.log('Power: ', data);
  };

  const handleScanStop = () => {
    console.log('Scanning Stopped');
  };

  const handleButton = () => {
    console.log('button pressed');
  };

  const handleError = (error: Error) => {
    console.log('Got error: ', error);
  };

  useEffect(() => {
    const startBleSensors = async () => {
      const bleSensor = new BleSensors();
      await bleSensor.requestPermissions();
      await bleSensor.start();
      await bleSensor.startSensorDiscovery();
      bleSensor.subscribeToDiscovery(handleDiscoverPeripheral);
      bleSensor.subscribeToDiscoveryStop(handleScanStop);
      await sleep(10000);
      const sensorList = await bleSensor.getDiscoveredSensors();
      console.log(sensorList);
      if (sensorList[0]?.sensorType?.includes('CyclingPower')) {
        console.log(sensorList[0]);
        const pm = new PowerMeter(sensorList[0].id);
        console.log(pm);
        await pm.connect().catch((err) => handleError(err));
        pm.subscribe(handlePowerData);
        await sleep(2000);
        const list = await bleSensor.getConnectedSensors();
        console.log('Connected list: ', list);
        await sleep(5000);
        let sensorLocation = await pm
          .getSensorLocation()
          .catch((err) => handleError(err));
        console.log('Sensor is on: ', sensorLocation);
        await sleep(5000);
        await pm.disconnect().catch((err) => handleError(err));
      }
    };

    startBleSensors(); // run it, run it

    return () => {
      // this now gets called when the component unmounts
    };
  }, []);

  return (
    <SafeAreaView style={styles.container}>
      <View>
        <Text>Testing...</Text>
        <Button title={'Scan Bluetooth'} onPress={handleButton} />
      </View>
    </SafeAreaView>
  );
};

export default App

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT

---

Made with create-react-native-library

react-native-cycling-sensors's Issues

change return of GetDiscovered

it should return an array with augmented type of sensor rather than grouped into types

Implement CSC for power meters that have '2a5d` char on the 1818 power service

Add method to get list of connected Ble Devices

Need to just surface the underlying method

HRM Pro connects but data is always undefined

Generic sensor class should have a isPeripheralConnected() method.

We need this so that we can periodically query if the powermeter, hrm, etc that we are working with is actually still connected to our phone

Cadence data output needs to output a specific cadence value.

Currently the cadence service output contains things like crank_event, etc, but does not actually calculate the cadence, so we need to do that and add it to the data.

Add support for battery level indication

Add subscribe method for scanning stopped.

Add methods to remove listeners

sensors don't properly disconnect

forerunner watch doesn't disconnect with disconnect call.

We also need to remove the notifiers

Add battery level to data for sensors that offer that service