zwack/lib/ftms/ftms-service.js

Simulate an indoor bicycle trainer with BLE (Bluetooth Low Energy)

// Doc: https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.service.fitness_machine.xml
const Bleno = require('@abandonware/bleno');

// 0x2ACC
//const FitnessMachineFeatureCharacteristic = require('./fitness-machine-feature-characteristic');
const TreadmillDataCharacteristic = require('./treadmill-data-characteristic');

class FitnessMachineService extends Bleno.PrimaryService {
    constructor() {
        let powerMeasurement = new CyclingPowerMeasurementCharacteristic();
        super({
            uuid: '1818',
            characteristics: [
                powerMeasurement,
                new StaticReadCharacteristic('2A65', 'Cycling Power Feature', [0x08, 0, 0, 0]), // 0x08 - crank revolutions
                new StaticReadCharacteristic('2A5D', 'Sensor Location', [13]), // 13 = rear hub
            ],
        });

        this.powerMeasurement = powerMeasurement;
    }

    notify(event) {
        this.powerMeasurement.notify(event);
        return this.RESULT_SUCCESS;
    }
}

module.exports = FitnessMachineService;