printer discovery in print service

Inspectron.Epson/DiscoveryService.cs

@@ -3,7 +3,7 @@ using System.Net.Sockets;
 
 namespace Inspectron.Epson;
 
-public class ENPCDiscoveryService
+public class DiscoveryService : IDiscoveryService
 {
     private const int DiscoveryPort = 3289;
     private const string DiscoveryMessage = "EPSONQ";

Inspectron.Epson/IDiscoveryService.cs

@@ -0,0 +1,17 @@
+namespace Inspectron.Epson;
+
+/// <summary>
+/// Interface for ENPC printer discovery service
+/// </summary>
+public interface IDiscoveryService
+{
+    /// <summary>
+    /// Discovers Epson printers on the local network using UDP broadcast
+    /// </summary>
+    /// <param name="timeout">How long to wait for responses (default: 5 seconds)</param>
+    /// <param name="onPrinterDiscovered">Optional callback invoked when a printer is discovered</param>
+    /// <returns>List of discovered printer information</returns>
+    Task<List<DiscoveredPrinter>> DiscoverPrintersAsync(
+        TimeSpan? timeout = null,
+        Action<DiscoveredPrinter>? onPrinterDiscovered = null);
+}