Web BLE Demo

arraybuffer.js

startDemo() {
        let JUMPER_SERVICE = "cdeacb80-5235-4c07-8846-93a37ee6b86d";
        let JUMPER_CHARACTERISTIC = "cdeacb81-5235-4c07-8846-93a37ee6b86d";

        navigator.bluetooth.requestDevice({filters: [{services: [JUMPER_SERVICE]}]})
        .then(device => device.gatt.connect())
        .then(server => {
          console.log('Connected to device');
          return server.getPrimaryService(JUMPER_SERVICE);
        })
        .then(service => service.getCharacteristic(JUMPER_CHARACTERISTIC))
        .then(characteristic => characteristic.startNotifications())
        .then(characteristic => {
          characteristic.addEventListener('characteristicvaluechanged', handleCharacteristicValueChanged);
          console.log('Notifications have been started.');
        })
        .catch(error => {
          console.log(error);
        });

        function handleCharacteristicValueChanged(event) {
          var value = event.target.value;
          console.log(value);
        }
      }

decode.js

if (value.getUint8(0) == '129') {
  console.log(value.getUint8(1) + ',' + value.getUint8(2) + ',' + value.getUint8(3));
}