tests/html/bluetooth_characteristic_info.html

<!DOCTYPE html>
<html>
<title>Characteristic info</title>
<body>
    <input id="service" type="text" autofocus placeholder="Bluetooth Service">
    <input id="characteristic" type="text" autofocus placeholder="Bluetooth Characteristic">
    <button type="button" onclick="onButtonClick()">Get Characteristic Info</button>
    <pre id="log"></pre>
    <script>
    function onButtonClick() {
        clear();
        var serviceUuid = document.getElementById('service').value;
        if (serviceUuid.startsWith('0x'))
            serviceUuid = parseInt(serviceUuid, 16);

        var characteristicUuid = document.getElementById('characteristic').value;
        if (characteristicUuid.startsWith('0x'))
            characteristicUuid = parseInt(characteristicUuid, 16);

        try {
            log('Requesting Bluetooth Device...');
            var device = window.navigator.bluetooth.requestDevice({filters: [{services: [serviceUuid]}]});

            log('Connecting to GATTserver on device...');
            var server = device.gatt.connect();

            log('Getting Primary Service...');
            var primaryService = server.getPrimaryService(serviceUuid);

            log('Getting Characteristic...');
            var characteristic = primaryService.getCharacteristic(characteristicUuid);

            log('Characteristic found!');
            log('> Characteristic service: ' + characteristic.service.uuid);
            log('> Characteristic UUID:    ' + characteristic.uuid);
            log('> Broadcast:              ' + characteristic.properties.broadcast);
            log('> Read:                   ' + characteristic.properties.read);
            log('> Write w/o response:     ' + characteristic.properties.writeWithoutResponse);
            log('> Write:                  ' + characteristic.properties.write);
            log('> Notify:                 ' + characteristic.properties.notify);
            log('> Indicate:               ' + characteristic.properties.indicate);
            log('> Signed Write:           ' + characteristic.properties.authenticatedSignedWrites);
            log('> Queued Write:           ' + characteristic.properties.reliableWrite);
            log('> Writable Auxiliaries:   ' + characteristic.properties.writableAuxiliaries);
            characteristic.readValue();
            log('> Characteristic value:   ' + AsciiToDecimal(characteristic.value));
        } catch(err) {
            log(err);
        }
    }

    function clear() {
        document.getElementById("log").textContent = "";
    }

    function log(line) {
        document.getElementById("log").textContent += line + '\n';
    }

    function AsciiToDecimal(bytestr) {
        var result = [];
        for(i = 0; i < bytestr.length; i++) {
            result[i] = bytestr[i].charCodeAt(0) ;
        }
        return result;
    }
    </script>
</body>
</html>