Samsung Galaxy Watch Companion App Tutorial - Part 2

accessoryservices.xml

<?xml version="1.0" encoding="utf-8" ?>
<resources>
  <application name="GalaxyConsumer">
    <serviceProfile id="/com/example" name="GalaxyConsumer" role="consumer"  version="1.0">
      <supportedTransports>
        <transport type="TRANSPORT_BT"/>
      </supportedTransports>
      <serviceChannel id="330" dataRate="low" priority="low" reliability="enable">
      </serviceChannel>
    </serviceProfile>
  </application>
</resources>

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="GalaxyConsumer.MainPage">
  <ContentPage.Content>  
        <StackLayout
                HorizontalOptions="FillAndExpand"
                Orientation="Vertical"
                VerticalOptions="FillAndExpand">
            <Button 
                    x:Name="connectButton"
                    Text="Connect"
                    Clicked="On_Connect_Clicked"
                    HorizontalOptions="FillAndExpand" />
            <Button 
                    x:Name="disconnectButton"
                    Text="Disconnect"
                    Clicked="On_Disconnect_Clicked"
                    HorizontalOptions="FillAndExpand"/>
        </StackLayout>
  </ContentPage.Content>
</ContentPage>

MainPage.xaml.cs

using Samsung.Sap;
using System;
using System.Linq;

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace GalaxyConsumer
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class MainPage : ContentPage
    {
        private Agent agent;
        private Peer peer;
        private Connection connection;
        private bool isSearchRunning;

        public MainPage()
        {
            InitializeComponent();
        }

        private void On_Connect_Clicked(object sender, EventArgs e)
        {
            if (peer == null && !isSearchRunning)
            {
                SearchForPeersAndConnectAsync();
            }
        }

        private void On_Disconnect_Clicked(object sender, EventArgs e)
        {
            Disconnect();
        }

        private async void SearchForPeersAndConnectAsync()
        {
            try
            {
                isSearchRunning = true;

                agent = await Agent.GetAgent("/com/example");
                var peers = await agent.FindPeers();
                if (peers.Count() > 0)
                {
                    peer = peers.First();
                    connection = peer.Connection;
                    connection.DataReceived -= Connection_DataReceived;
                    connection.DataReceived += Connection_DataReceived;
                    connection.StatusChanged -= Connection_StatusChanged;
                    connection.StatusChanged += Connection_StatusChanged;
                    await connection.Open();
                    ShowToastMessage("Connection success, you can now receive data");
                }
                else
                {
                    ShowToastMessage("Error while searching for peer. Is the bluetooth connection enabled?");
                }
            }
            catch (Exception)
            {
                ShowToastMessage("Error while connecting to peer");
                Disconnect();
            }
            finally
            {
                isSearchRunning = false;
            }
        }

        private void Connection_StatusChanged(object sender, ConnectionStatusEventArgs e)
        {
            if (e.Reason == ConnectionStatus.ConnectionClosed || e.Reason == ConnectionStatus.ConnectionLost)
            {
                Disconnect();
            }
        }

        private void Disconnect()
        {
            if (connection != null)
            {
                connection.DataReceived -= Connection_DataReceived;
                connection.StatusChanged -= Connection_StatusChanged;
                connection.Close();
            }
            connection = null;
            peer = null;
            agent = null;
        }

        private void Connection_DataReceived(object sender, Samsung.Sap.DataReceivedEventArgs receivedEventArgs)
        {
            var data = System.Text.Encoding.ASCII.GetString(receivedEventArgs.Data);
            ShowToastMessage(data);
        }

        private void ShowToastMessage(string message)
        {
            Tizen.Wearable.CircularUI.Forms.Toast.DisplayText(message, 3000);
        }
    }
}