I’m in IoT
Harald
Bluetooth
2.4 GHz
Bluetooth EDR
- 2.0 standard in 2004
- Speed up with Enhanced Data Rate
- Permanent connection
- Short distances, up to 10m
- 5.0 already
Bluetooth LE
- 4.0 standard in 2010
- Low Energy profile
- Short connections
- Long distances, up to 100m
- Slow speed
nRF Connect
Services
- UUIDs
9a66ff08-0800-9191-11e4-012d1540cb8e or 0xFF08
- Standard services:
battery_service or 0x180Fblood_pressure or 0x1810weight_scale or 0x181D
Unknown Service in most cases, although there are 35 standard ones.
Characteristics
- The same UUIDs
- Standard characteristics:
battery_level or 0x2A19waist_circumference or 0x2A97sport_type_for_aerobic_and_anaerobic_thresholds
Unknown Characteristic in most cases, although there are 179 standard ones.
Lamp!
Lamp
navigator.bluetooth.requestDevice({
filters: [{ name: 'Bulb' }],
optionalServices: [0xFF08]
}).then(device => {
return device.gatt.connect();
}).then(server)
Lamp
.then(server => {
return server.getPrimaryService(0xFF08);
}).then(service => {
return service.getCharacteristic(0xFFFC);
}).then(characteristic)
Color validation
<input type="text"
pattern="^#(?:[0-9a-fA-F]{3}){1,2}$"
required value="#FFF">
<script>
if (event.target.checkValidity()) {
</script>
Lamp
.then(characteristic => {
return characteristic.writeValue(
new Uint8Array([0, 255, 0, 0])
);
});
Rainbow
const LAMP_EFFECT = [ 0x00,
0xFF,
0xFF,
0xFF,
0x03,
0x00,
0x06, 0x06 ];
Drone!
