AdjutantOS addon for Android, this turns my office equipment (lights, computers) on and off at the press of a button.

MainActivity.cs

using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

using FragLabs.AdjutantOS.API;
using FragLabs.AdjutantOS.API.Addons;
using FragLabs.AdjutantOS.API.Services;

namespace AdjutantPowerSwitch
{
	[Activity (Label = "Office Power Switch", MainLauncher = true)]
	public class MainActivity : Activity
	{
		const string AdjutantServiceIntent = "com.adjutantos.AdjutantService";

		Button _btnOn;
		Button _btnOff;
		AddonClient _addonClient;
		bool _attemptedServiceStart;

		protected override void OnCreate (Bundle bundle)
		{
			base.OnCreate (bundle);

			// Set our view from the "main" layout resource
			SetContentView (Resource.Layout.Main);

			AddonClient.Bootstrap();
			Console.WriteLine(FragLabs.AdjutantOS.API.Environment.IsAddon);
			Console.WriteLine(FragLabs.AdjutantOS.API.Environment.NodeType);
			_addonClient = new AddonClient();
			_addonClient.ConnectComplete += HandleConnectComplete;
			_addonClient.Connect();

			_btnOn = FindViewById<Button>(Resource.Id.btnOn);
			_btnOff = FindViewById<Button>(Resource.Id.btnOff);

			_btnOn.Click += (sender, e) => {
				if (_addonClient.IsConnected && _addonClient.GetConnectionInformation().ConnectedToServer)
				{
					ServiceInvoker.CallOneWay(DeviceRepository.Server, new OfficeSwitch() { OnOff = "on" });
					Toast.MakeText(this, "Turning on the office", ToastLength.Short).Show();
				}
				else
				{
					Toast.MakeText(this, "Not connected to server", ToastLength.Short).Show();
					if (!_addonClient.IsConnected)
						_addonClient.Connect();
				}
			};
			_btnOff.Click += (sender, e) => {
				if (_addonClient.IsConnected && _addonClient.GetConnectionInformation().ConnectedToServer)
				{
					ServiceInvoker.CallOneWay(DeviceRepository.Server, new OfficeSwitch() { OnOff = "off" });
					Toast.MakeText(this, "Turning off the office", ToastLength.Short).Show();
				}
				else
				{
					Toast.MakeText(this, "Not connected to server", ToastLength.Short).Show();
					if (!_addonClient.IsConnected)
						_addonClient.Connect();
				}
			};
		}

		void HandleConnectComplete (object sender, AddonClientEventArgs e)
		{
			if (!e.Success && !_attemptedServiceStart)
			{
				//  service isn't running, attempt to start it
				_attemptedServiceStart = true;
				StartService(new Intent(AdjutantServiceIntent));
				_addonClient.Connect();
			}
			else if (!e.Success && _attemptedServiceStart)
			{
				RunOnUiThread(()=>{
					Toast.MakeText(this, "Failed to start AdjutantOS service", ToastLength.Short).Show();
				});
			}
			else if (e.Success)
			{
				RunOnUiThread(()=>{
					Toast.MakeText(this, "Connected to server", ToastLength.Short).Show();
				});
			}
		}
	}

	public class OfficeSwitch : IRequestDto
	{
		public string GetUri()
		{
			return "/anonymous/officeswitch";
		}

		public string OnOff { get; set; }
	}
}