Add bluetooth-lowenergy services and writable characteristics to smartephone Xamarin - xamarin.forms

Question

I am developing a mobile application that use bluetooth-lowenergy, i need to create services and characteristics in the application
Thanks

Answer 1

this after two days of search, and by reading this page BLE Android i solved my problem
here the class used to create services
using System;
using Android.App;
using Android.Bluetooth;
using Android.Bluetooth.LE;
using Android.OS;
using Java.Util;
using SitBle.Droid;
using SitBle.Interfaces;
using Exception = System.Exception;
[assembly: Xamarin.Forms.Dependency(typeof(Advertiser))]
namespace SitBle.Droid
{
public class Advertiser : IAdvertiser
{
private BluetoothAdvertiseCallback _advertiseCallback;
private readonly UUID _serviceUuid = UUID.FromString("795090c7-420d-4048-a24e-18e60180e23c");
private readonly UUID _characteristicCounterUuid = UUID.FromString("31517c58-66bf-470c-b662-e352a6c80cba");
private readonly UUID _characteristicInteractorUuid = UUID.FromString("0b89d2d4-0ea6-4141-86bb-0c5fb91ab14a");
private readonly UUID _descriptorConfigUuid = UUID.FromString("00002902-0000-1000-8000-00805f9b34fb");
public void Advertise()
{
try
{
_advertiseCallback = new BluetoothAdvertiseCallback();
var androidBluetoothGattServerCallback = new AndroidBluetoothGattServerCallback();
var adapter = BluetoothAdapter.DefaultAdapter;
var advertiseSettingBuilder = new AdvertiseSettings.Builder()
.SetAdvertiseMode(AdvertiseMode.Balanced).SetConnectable(true).SetTimeout(0)
.SetTxPowerLevel(AdvertiseTx.PowerMedium);
var advertiseSetting = advertiseSettingBuilder.Build();
var adverisingDataBuilder = new AdvertiseData.Builder().SetIncludeDeviceName(false).AddServiceUuid(new ParcelUuid(_serviceUuid));
adapter.BluetoothLeAdvertiser.StartAdvertising(advertiseSetting, adverisingDataBuilder.Build(), _advertiseCallback);
var appContext = Application.Context;
var mBluetoothManager = (BluetoothManager)appContext.GetSystemService("bluetooth");
var mGattServer = mBluetoothManager.OpenGattServer(appContext, androidBluetoothGattServerCallback);
mGattServer.AddService(CreateService());
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
}
private BluetoothGattService CreateService()
{
BluetoothGattService service = new BluetoothGattService(_serviceUuid, GattServiceType.Primary);
// Counter characteristic (read-only, supports subscriptions)
BluetoothGattCharacteristic counter = new BluetoothGattCharacteristic(_characteristicCounterUuid,GattProperty.Read|GattProperty.Notify,GattPermission.Read);
BluetoothGattDescriptor counterConfig = new BluetoothGattDescriptor(_descriptorConfigUuid, GattDescriptorPermission.Read|GattDescriptorPermission.Write);
counter.AddDescriptor(counterConfig);
// Interactor characteristic
BluetoothGattCharacteristic interactor = new BluetoothGattCharacteristic(_characteristicInteractorUuid, GattProperty.Read|GattProperty.Write|GattProperty.Notify, GattPermission.Write);
service.AddCharacteristic(counter);
service.AddCharacteristic(interactor);
return service;
}
}
public class BluetoothAdvertiseCallback : AdvertiseCallback
{
public BluetoothAdvertiseCallback()
{
}
public override void OnStartSuccess(AdvertiseSettings settingsInEffect)
{
Console.WriteLine("Success");
}
public override void OnStartFailure(AdvertiseFailure errorCode)
{
Console.WriteLine("Fail");
}
}
public class AndroidBluetoothGattServerCallback : BluetoothGattServerCallback
{
public AndroidBluetoothGattServerCallback()
{
}
}
}