@polymer/platinum-bluetooth

Demo and API Docs

<platinum-bluetooth-characteristic>

The <platinum-bluetooth-characteristic> element allows you to read and write characteristics on nearby bluetooth devices thanks to the young Web Bluetooth API. It is currently only partially implemented in Chrome OS 45 and Chrome 49 for Android behind the experimental flag chrome://flags/#enable-web-bluetooth.

<platinum-bluetooth-characteristic> needs to be a child of a <platinum-bluetooth-service> element.

For instance, here's how to read battery level from a nearby bluetooth device advertising Battery service:

<platinum-bluetooth-device services-filter='["battery_service"]'>
  <platinum-bluetooth-service service='battery_service'>
    <platinum-bluetooth-characteristic characteristic='battery_level'>
    </platinum-bluetooth-characteristic>
  </platinum-bluetooth-service>
</platinum-bluetooth-device>

var bluetoothDevice = document.querySelector('platinum-bluetooth-device');
var batteryLevel = document.querySelector('platinum-bluetooth-characteristic');

button.addEventListener('click', function() {
  bluetoothDevice.request().then(function() {
    return batteryLevel.read().then(function(value) {
      console.log('Battery Level is ' + value.getUint8(0) + '%');
    });
  })
  .catch(function(error) { });
});

Here's another example on how to reset energy expended on nearby bluetooth device advertising Heart Rate service:

<platinum-bluetooth-device services-filter='["heart_rate"]'>
  <platinum-bluetooth-service service='heart_rate'>
    <platinum-bluetooth-characteristic characteristic='heart_rate_control_point'>
    </platinum-bluetooth-characteristic>
  </platinum-bluetooth-service>
</platinum-bluetooth-device>

var bluetoothDevice = document.querySelector('platinum-bluetooth-device');
var heartRateCtrlPoint = document.querySelector('platinum-bluetooth-characteristic');

button.addEventListener('click', function() {
  bluetoothDevice.request().then(function() {
    // Writing 1 is the signal to reset energy expended.
    var resetEnergyExpended = new Uint8Array([1]);
    return heartRateCtrlPoint.write(resetEnergyExpended).then(function() {
      console.log('Energy expended has been reset');
    });
  })
  .catch(function(error) { });
});

It is also possible for <platinum-bluetooth-characteristic> to fill in a data-bound field in response to a read.

<platinum-bluetooth-device services-filter='["heart_rate"]'>
  <platinum-bluetooth-service service='heart_rate'>
    <platinum-bluetooth-characteristic characteristic='body_sensor_location'
                                       value={{bodySensorLocation}}>
    </platinum-bluetooth-characteristic>
  </platinum-bluetooth-service>
</platinum-bluetooth-device>
...
<span>{{bodySensorLocation}}</span>

var bluetoothDevice = document.querySelector('platinum-bluetooth-device');
var bodySensorLocation = document.querySelector('platinum-bluetooth-characteristic');

button.addEventListener('click', function() {
  bluetoothDevice.request().then(function() {
    return bodySensorLocation.read()
  })
  .catch(function(error) { });
});

Starting and stopping notifications on a <platinum-bluetooth-characteristic> is pretty straightforward when taking advantage of the Polymer Change notification protocol. Here's how to get your Heart Rate Measurement for instance:

<platinum-bluetooth-device services-filter='["heart_rate"]'>
  <platinum-bluetooth-service service='heart_rate'>
    <platinum-bluetooth-characteristic characteristic='heart_rate_measurement'
                                       on-value-changed='parseHeartRate'>
    </platinum-bluetooth-characteristic>
  </platinum-bluetooth-service>
</platinum-bluetooth-device>

var bluetoothDevice = document.querySelector('platinum-bluetooth-device');
var heartRate = document.querySelector('platinum-bluetooth-characteristic');

startButton.addEventListener('click', function() {
  bluetoothDevice.request().then(function() {
    return heartRate.startNotifications().catch(function(error) { });
  });
});

stopButton.addEventListener('click', function() {
  heartRate.stopNotifications().catch(function(error) { });
});

function parseHeartRate(event) {
 let value = event.target.value;
 // Do something with the DataView Object value...
}

You can also use changes in value to drive characteristic writes when auto-write property is set to true.

<platinum-bluetooth-device services-filter='["heart_rate"]'>
  <platinum-bluetooth-service service='heart_rate'>
    <platinum-bluetooth-characteristic characteristic='heart_rate_control_point'
                                              auto-write>
    </platinum-bluetooth-characteristic>
  </platinum-bluetooth-service>
</platinum-bluetooth-device>

var bluetoothDevice = document.querySelector('platinum-bluetooth-device');
var heartRateCtrlPoint = document.querySelector('platinum-bluetooth-characteristic');

button.addEventListener('click', function() {
  bluetoothDevice.request().then(function() {
    // Writing 1 is the signal to reset energy expended.
    heartRateCtrlPoint.value = new Uint8Array([1]);
  })
  .catch(function(error) { });
});

heartRateCtrlPoint.addEventListener('platinum-bluetooth-auto-write-error',
    function(event) {
  // Handle error...
});

<platinum-bluetooth-device>

The <platinum-bluetooth-device> element allows you to discover nearby bluetooth devices thanks to the young Web Bluetooth API. It is currently only partially implemented in Chrome OS 45 and Chrome 49 for Android behind the experimental flag chrome://flags/#enable-web-bluetooth.

<platinum-bluetooth-device> is used as a parent element for <platinum-bluetooth-service> child elements.

For instance, here's how to request a nearby bluetooth device advertising Battery service:

<platinum-bluetooth-device services-filter='["battery_service"]'>
</platinum-bluetooth-device>

button.addEventListener('click', function() {
  document.querySelector('platinum-bluetooth-device').request()
  .then(function(device) { console.log(device.name); })
  .catch(function(error) { console.error(error); });
});

You can also request a nearby bluetooth device by setting a filter on a name or name Prefix:

<platinum-bluetooth-device name-filter='foobar'>
</platinum-bluetooth-device>

<platinum-bluetooth-device name-prefix-filter='foo'>
</platinum-bluetooth-device>

And you can combine some of the filters as well. Here's how to request a nearby bluetooth device advertising Battery service and whose name is "foobar":

<platinum-bluetooth-device services-filter='["battery_service"]'
                           name-filter='foobar'>
</platinum-bluetooth-device>

Disconnecting manually from a connected bluetooth device is pretty straightforward:

disconnectButton.addEventListener('click', function() {
  document.querySelector('platinum-bluetooth-device').disconnect();
});

<platinum-bluetooth-service>

The <platinum-bluetooth-service> element is used in conjuction with the <platinum-bluetooth-characteristic> element to read and write characteristics on nearby bluetooth devices thanks to the young Web Bluetooth API. It is currently only partially implemented in Chrome OS 45 and Chrome 49 for Android behind the experimental flag chrome://flags/#enable-web-bluetooth.

<platinum-bluetooth-service> needs to be a child of a <platinum-bluetooth-device> element.

For instance, here's how to read battery level from a nearby bluetooth device advertising Battery service:

<platinum-bluetooth-device services-filter='["battery_service"]'>
  <platinum-bluetooth-service service='battery_service'>
    <platinum-bluetooth-characteristic characteristic='battery_level'>
    </platinum-bluetooth-characteristic>
  </platinum-bluetooth-service>
</platinum-bluetooth-device>

var bluetoothDevice = document.querySelector('platinum-bluetooth-device');
var batteryLevel = document.querySelector('platinum-bluetooth-characteristic');

button.addEventListener('click', function() {
  bluetoothDevice.request().then(function() {
    return batteryLevel.read().then(function(value) {
      console.log('Battery Level is ' + value.getUint8(0) + '%');
    });
  })
  .catch(function(error) { });
});