public class PostXcodeBuild
{
    [PostProcessBuild]
    public static void SetXcodePlist(BuildTarget buildTarget, string pathToBuiltProject)
    {
        if (buildTarget != BuildTarget.iOS) return;
        var plistPath = pathToBuiltProject + "/Info.plist";
        var plist = new PlistDocument();
        plist.ReadFromString(File.ReadAllText(plistPath));
        var rootDict = plist.root;
        rootDict.SetString("NSBluetoothAlwaysUsageDescription", "use ble");
        File.WriteAllText(plistPath, plist.WriteToString());
    }
}

manager = CoreBluetoothManager.Shared;

manager.OnUpdateState((string state) =>
{
    Debug.Log("state: " + state);
    if (state != "poweredOn") return;
    manager.StartScan();
});

manager.OnDiscoverPeripheral((CoreBluetoothPeripheral peripheral) =>
{
    if (peripheral.name != "")
        Debug.Log("discover peripheral name: " + peripheral.name);
    if (peripheral.name != "Daydream controller") return;

    manager.StopScan();
    manager.ConnectToPeripheral(peripheral);
});

manager.OnConnectPeripheral((CoreBluetoothPeripheral peripheral) =>
{
    Debug.Log("connected peripheral name: " + peripheral.name);
    peripheral.discoverServices();
});

manager.OnDiscoverService((CoreBluetoothService service) =>
{
    Debug.Log("discover service uuid: " + service.uuid);
    if (service.uuid != "FE55") return;
    service.discoverCharacteristics();
});

manager.OnDiscoverCharacteristic((CoreBluetoothCharacteristic characteristic) =>
{
    string uuid = characteristic.uuid;
    string usage = characteristic.propertis[0];
    Debug.Log("discover characteristic uuid: " + uuid + ", usage: " + usage);
    if (usage != "notify") return;
    characteristic.setNotifyValue(true);
});

manager.OnUpdateValue((CoreBluetoothCharacteristic characteristic, byte[] data) =>
{
    this.value = data;
    this.flag = true;
});

manager.Start();

byte[] value = { 0x64, 0x68 };
characteristic.Write(value);