do not discover while printing

EpsonPrintService/EpsonPrintService.csproj

@@ -5,7 +5,7 @@
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
-	  <Version>1.0.4</Version>
+	  <Version>1.0.5</Version>
   </PropertyGroup>
 
   <ItemGroup>

EpsonPrintService/PrinterDiscoveryBackgroundTask.cs

@@ -67,10 +67,11 @@ public class PrinterDiscoveryBackgroundTask
 
     private async Task DiscoverAndNotifyAsync()
     {
+        _printServer.EnterDiscoveryLock();
         try
         {
             var printers = await _discoveryService.DiscoverPrintersAsync(_discoveryTimeout);
-            
+
             var currentIps = printers.Select(p => p.IPAddress).ToHashSet();
 
             foreach (string currentIp in currentIps)
@@ -90,6 +91,10 @@ public class PrinterDiscoveryBackgroundTask
         {
             _logger.LogWarning(ex, "Failed to discover printers");
         }
+        finally
+        {
+            _printServer.ExitDiscoveryLock();
+        }
     }
 
     private bool HasConfigurationChanged(HashSet<string> currentIps)