diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Elektrifikatsiya.csproj b/src/Elektrifikatsiya/Elektrifikatsiya/Elektrifikatsiya.csproj
index 9d16e3c..4dca5d7 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Elektrifikatsiya.csproj
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Elektrifikatsiya.csproj
@@ -18,12 +18,21 @@
 	</PropertyGroup>
 
 	<ItemGroup>
+	  <Compile Remove="Middleware\**" />
 	  <Compile Remove="Model\**" />
+	  <Content Remove="Middleware\**" />
 	  <Content Remove="Model\**" />
+	  <EmbeddedResource Remove="Middleware\**" />
 	  <EmbeddedResource Remove="Model\**" />
+	  <None Remove="Middleware\**" />
 	  <None Remove="Model\**" />
 	</ItemGroup>
 
+	<ItemGroup>
+	  <None Remove="Models\NewFile.txt" />
+	  <None Remove="Models\ShellyResponse" />
+	</ItemGroup>
+
 	<ItemGroup>
 		<PackageReference Include="Blazorise" Version="1.2.0" />
 		<PackageReference Include="Blazorise.Charts" Version="1.2.0" />
@@ -35,10 +44,7 @@
 		<PackageReference Include="Microsoft.EntityFrameworkCore" Version="7.0.2" />
 		<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.2" />
 		<PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.17.0" />
-	</ItemGroup>
-
-	<ItemGroup>
-	  <Folder Include="Middleware\" />
+		<PackageReference Include="Tmds.MDns" Version="0.7.1" />
 	</ItemGroup>
 
 </Project>
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Models/PrometheusQueryResult.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Models/PrometheusQueryResult.cs
new file mode 100644
index 0000000..9732592
--- /dev/null
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Models/PrometheusQueryResult.cs
@@ -0,0 +1,73 @@
+using System.Text.Json.Serialization;
+
+namespace Elektrifikatsiya.Models;
+
+public enum Status
+{
+    Success,
+    Error
+}
+
+public enum ResultType
+{
+    Matrix,
+    Vector,
+    Scalar,
+    String
+}
+
+public class PrometheusQueryResult
+{
+    public Status Status { get; set; }
+
+    public string? ErrorType { get; set; }
+    public string? Error { get; set; }
+    public List<string>? Warnings { get; set; }
+
+    public PrometheusQueryResult(Status status, string? errorType, string? error, List<string>? warnings)
+    {
+        Status = status;
+        ErrorType = errorType;
+        Error = error;
+        Warnings = warnings;
+    }
+}
+
+internal class PrometheusDataWrapper
+{
+    public ResultType ResultType { get; set; }
+    public List<PrometheusData> Result { get; set; }
+
+    public PrometheusDataWrapper(ResultType resultType, List<PrometheusData> result)
+    {
+        ResultType = resultType;
+        Result = result;
+    }
+}
+
+internal class PrometheusDataMetric
+{
+    [JsonPropertyName("__name__")] public string Name { get; set; }
+
+    public string Job { get; set; }
+    public string Instance { get; set; }
+
+    public PrometheusDataMetric(string name, string job, string instance)
+    {
+        Name = name;
+        Job = job;
+        Instance = instance;
+    }
+}
+
+internal class PrometheusData
+{
+    public PrometheusDataMetric Metric { get; set; }
+    public object Value { get; set; }
+
+    public PrometheusData(PrometheusDataMetric metric, object value)
+    {
+        Metric = metric;
+        Value = value;
+    }
+}
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Models/ShellyResponse.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Models/ShellyResponse.cs
new file mode 100644
index 0000000..bf6cd03
--- /dev/null
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Models/ShellyResponse.cs
@@ -0,0 +1,13 @@
+namespace Elektrifikatsiya.Models;
+
+public class ShellyResponse
+{
+    public string Type { get; set; }
+    public string Mac { get; set; }
+
+    public ShellyResponse(string type, string mac)
+    {
+        Type = type;
+        Mac = mac;
+    }
+}
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/IDeviceManagmentService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/IDeviceManagmentService.cs
index 1da0c91..bda0e67 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Services/IDeviceManagmentService.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/IDeviceManagmentService.cs
@@ -10,7 +10,7 @@ public interface IDeviceManagmentService
 {
     public Task<Result<Device>> Register(IPAddress ip, User user, string? name = null, string room = "default");
 
-    public Task<Result> UnRegister(string macAdress);
+    public Task<Result> Unregister(string macAdress);
 
     public Result<Device> GetDevice(string macAdress);
 
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/IDeviceStatusService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/IDeviceStatusService.cs
index ef7fab3..61e1cc1 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Services/IDeviceStatusService.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/IDeviceStatusService.cs
@@ -13,4 +13,6 @@ public interface IDeviceStatusService
     public Result UpdateDeviceStatus(Device device);
 
     public Result TrackDevice(Device device);
+
+    public Result UntrackDevice(string macAddress);
 }
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/DeviceManagmentService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/DeviceManagmentService.cs
index 75e9a65..b659cf1 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/DeviceManagmentService.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/DeviceManagmentService.cs
@@ -4,6 +4,7 @@ using Elektrifikatsiya.Models;
 using FluentResults;
 
 using System.Net;
+using System.Net.NetworkInformation;
 
 namespace Elektrifikatsiya.Services.Implementations;
 
@@ -11,11 +12,13 @@ public class DeviceManagmentService : IDeviceManagmentService
 {
     private readonly DeviceManagmentDatabaseContext deviceManagmentDatabaseContext;
     private readonly IDeviceStatusService deviceStatusService;
+    private readonly HttpClient httpClient;
 
-    public DeviceManagmentService(DeviceManagmentDatabaseContext deviceManagmentDatabaseContext, IDeviceStatusService deviceStatusService)
+    public DeviceManagmentService(DeviceManagmentDatabaseContext deviceManagmentDatabaseContext, IDeviceStatusService deviceStatusService, HttpClient httpClient)
     {
         this.deviceManagmentDatabaseContext = deviceManagmentDatabaseContext;
         this.deviceStatusService = deviceStatusService;
+        this.httpClient = httpClient;
     }
 
     public Result<Device> GetDevice(string macAdress)
@@ -73,13 +76,50 @@ public class DeviceManagmentService : IDeviceManagmentService
         return getDevicesResult.Value.Where(d => d.User.Id == userId).ToList();
     }
 
-    public Task<Result<Device>> Register(IPAddress ip, User user, string? name = null, string room = "default")
+    public async Task<Result<Device>> Register(IPAddress ip, User user, string? name = null, string room = "default")
     {
-        throw new NotImplementedException();
+        ShellyResponse? shellyResponse = await httpClient.GetFromJsonAsync<ShellyResponse>($"{ip}/shelly");
+
+        if(shellyResponse is null || shellyResponse.Type != "SHPLG-S")
+        {
+            return Result.Fail("Device is not a \"SHPLG-S\" or not reachable!");
+        }
+
+        string mac = shellyResponse.Mac;
+
+        if(PhysicalAddress.TryParse(mac, out _))
+        {
+            return Result.Fail("Invalid mac address!");
+        }
+
+        Device device = new Device(mac, name ?? mac, ip, user, room);
+
+        deviceManagmentDatabaseContext.Add(device);
+        Result saveDatabaseChangesResult = await Result.Try(async Task () => await deviceManagmentDatabaseContext.SaveChangesAsync());
+
+        Result trackDeviceResult = deviceStatusService.TrackDevice(device);
+
+        return Result.Merge(saveDatabaseChangesResult, trackDeviceResult).ToResult(device);
     }
 
-    public Task<Result> UnRegister(string macAdress)
+    public async Task<Result> Unregister(string macAdress)
     {
-        throw new NotImplementedException();
+        Result<Device> getDeviceResult = GetDevice(macAdress);
+
+        if (getDeviceResult.IsFailed)
+        {
+            return getDeviceResult.ToResult();
+        }
+
+        Result untrackDeviceResult = deviceStatusService.UntrackDevice(macAdress);
+
+        if (untrackDeviceResult.IsFailed)
+        {
+            return untrackDeviceResult;
+        }
+
+        deviceManagmentDatabaseContext.Remove(getDeviceResult.Value);
+
+        return await Result.Try(async Task () => await deviceManagmentDatabaseContext.SaveChangesAsync());
     }
 }
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/DeviceStatusService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/DeviceStatusService.cs
index 8b4263e..3574cec 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/DeviceStatusService.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/DeviceStatusService.cs
@@ -45,4 +45,9 @@ public class DeviceStatusService : IDeviceStatusService
 
         return Result.Ok();
     }
+
+    public Result UntrackDevice(string macAddress)
+    {
+        return devices.Remove(macAddress) ? Result.Ok() : Result.Fail("Device is not tracked!");
+    }
 }
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/UpdateService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/UpdateService.cs
index 6271a23..980826d 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/UpdateService.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/UpdateService.cs
@@ -1,7 +1,8 @@
 using Elektrifikatsiya.Database;
 using Elektrifikatsiya.Models;
-
+using FluentResults;
 using Microsoft.EntityFrameworkCore;
+using System.Threading.Tasks;
 
 namespace Elektrifikatsiya.Services.Implementations;
 
@@ -28,14 +29,24 @@ public class UpdateService : IHostedService, IDisposable
             _ = deviceStatusService.TrackDevice(device);
         }
 
-        timer = new Timer(Update, null, TimeSpan.Zero, TimeSpan.FromSeconds(15));
+        timer = new Timer(async (_) => await Update(), null, TimeSpan.Zero, TimeSpan.FromSeconds(15));
 
         logger.LogInformation("Update service started.");
     }
 
-    private void Update(object? state)
+    private async Task Update()
     {
-        //TODO: Update all devices.
+        Result<List<Device>> getDeviceStatusResult = deviceStatusService.GetDevices();
+
+        if (getDeviceStatusResult.IsFailed)
+        {
+            logger.LogError("Updating devices failed!");
+        }
+
+        foreach(Device device in getDeviceStatusResult.Value)
+        {
+            //TODO: Some update magic
+        }
     }
 
     public Task StopAsync(CancellationToken cancellationToken)
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/PrometheusQuery.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/PrometheusQuery.cs
new file mode 100644
index 0000000..a635857
--- /dev/null
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/PrometheusQuery.cs
@@ -0,0 +1,25 @@
+using System.Net;
+using System.Net.Sockets;
+using System.Text.Encodings.Web;
+using System.Text.Json;
+using Elektrifikatsiya.Models;
+using FluentResults;
+
+namespace Elektrifikatsiya.Utilities;
+
+public class PrometheusQuery
+{
+    private string connectionString;
+    private readonly HttpClient client = new();
+
+    public PrometheusQuery(string connectionString)
+    {
+        this.connectionString = connectionString;
+        client.BaseAddress = new Uri(connectionString);
+    }
+
+    public  Task<PrometheusQueryResult?> Query(string query)
+    {
+        return client.GetFromJsonAsync<PrometheusQueryResult>($"/v1/query?{UrlEncoder.Create().Encode(query)}");
+    }
+}
\ No newline at end of file