mirror of
https://github.com/gosticks/DefinitelyTyped.git
synced 2025-10-16 12:05:41 +00:00
86 lines
2.6 KiB
TypeScript
86 lines
2.6 KiB
TypeScript
// Example 1 (from the spec):
|
|
let chosenHeartRateService: BluetoothRemoteGATTService = null;
|
|
|
|
navigator.bluetooth.requestDevice({
|
|
filters: [{
|
|
services: ['heart_rate'],
|
|
}]
|
|
}).then((device: BluetoothDevice) => device.gatt.connect())
|
|
.then((server: BluetoothRemoteGATTServer) => server.getPrimaryService('heart_rate'))
|
|
.then((service: BluetoothRemoteGATTService) => {
|
|
chosenHeartRateService = service;
|
|
return Promise.all([
|
|
service.getCharacteristic('body_sensor_location')
|
|
.then(handleBodySensorLocationCharacteristic),
|
|
service.getCharacteristic('heart_rate_measurement')
|
|
.then(handleHeartRateMeasurementCharacteristic),
|
|
]);
|
|
});
|
|
|
|
function handleBodySensorLocationCharacteristic(characteristic: BluetoothRemoteGATTCharacteristic) {
|
|
if (characteristic === null) {
|
|
console.log("Unknown sensor location.");
|
|
return Promise.resolve();
|
|
}
|
|
return characteristic.readValue()
|
|
.then(sensorLocationData => {
|
|
let sensorLocation = sensorLocationData.getUint8(0);
|
|
switch (sensorLocation) {
|
|
case 0: return 'Other';
|
|
case 1: return 'Chest';
|
|
case 2: return 'Wrist';
|
|
case 3: return 'Finger';
|
|
case 4: return 'Hand';
|
|
case 5: return 'Ear Lobe';
|
|
case 6: return 'Foot';
|
|
default: return 'Unknown';
|
|
}
|
|
}).then(location => console.log(location));
|
|
}
|
|
|
|
function handleHeartRateMeasurementCharacteristic(characteristic: BluetoothRemoteGATTCharacteristic) {
|
|
return characteristic.startNotifications()
|
|
.then(char => {
|
|
characteristic.addEventListener('characteristicvaluechanged',
|
|
onHeartRateChanged);
|
|
});
|
|
}
|
|
|
|
function onHeartRateChanged(event: Event) {
|
|
let characteristic = event.target as BluetoothRemoteGATTCharacteristic;
|
|
console.log(parseHeartRate(characteristic.value));
|
|
}
|
|
|
|
function parseHeartRate(data: DataView) {
|
|
let flags = data.getUint8(0);
|
|
let rate16Bits = flags & 0x1;
|
|
let result: any = {};
|
|
let index = 1;
|
|
if (rate16Bits) {
|
|
result.heartRate = data.getUint16(index, /*littleEndian=*/true);
|
|
index += 2;
|
|
} else {
|
|
result.heartRate = data.getUint8(index);
|
|
index += 1;
|
|
}
|
|
let contactDetected = flags & 0x2;
|
|
let contactSensorPresent = flags & 0x4;
|
|
if (contactSensorPresent) {
|
|
result.contactDetected = !!contactDetected;
|
|
}
|
|
let energyPresent = flags & 0x8;
|
|
if (energyPresent) {
|
|
result.energyExpended = data.getUint16(index, /*littleEndian=*/true);
|
|
index += 2;
|
|
}
|
|
let rrIntervalPresent = flags & 0x10;
|
|
if (rrIntervalPresent) {
|
|
let rrIntervals: number[] = [];
|
|
for (; index + 1 < data.byteLength; index += 2) {
|
|
rrIntervals.push(data.getUint16(index, /*littleEndian=*/true));
|
|
}
|
|
result.rrIntervals = rrIntervals;
|
|
}
|
|
return result;
|
|
}
|