discovery fix

EpsonPrintService/PrinterDiscoveryBackgroundTask.cs

@@ -67,34 +67,45 @@ public class PrinterDiscoveryBackgroundTask
 
     private async Task DiscoverAndNotifyAsync()
     {
-        _printServer.EnterDiscoveryLock();
+        List<DiscoveredPrinter> printers;
+        HashSet<string> currentIps;
+        bool configChanged;
+
+        await _printServer.EnterDiscoveryLockAsync();
         try
         {
-            var printers = await _discoveryService.DiscoverPrintersAsync(_discoveryTimeout);
+            printers = await _discoveryService.DiscoverPrintersAsync(_discoveryTimeout);
+            currentIps = printers.Select(p => p.IPAddress).ToHashSet();
+            configChanged = HasConfigurationChanged(currentIps);
 
-            var currentIps = printers.Select(p => p.IPAddress).ToHashSet();
-
-            foreach (string currentIp in currentIps)
+            if (configChanged)
             {
-                _printServer.RegisterPrinter(currentIp);
-            }
-
-            if (HasConfigurationChanged(currentIps))
-            {
-                _logger.LogInformation("Discovered printer configuration changed: {Count} printer(s)", printers.Count);
                 _lastDiscoveredPrinterIps = currentIps;
                 _lastDiscoveredPrinters = printers;
-                await _receiver.OnPrintersDiscoveredAsync(printers.AsReadOnly());
             }
         }
         catch (Exception ex)
         {
             _logger.LogWarning(ex, "Failed to discover printers");
+            return; // Exit early on error
         }
         finally
         {
             _printServer.ExitDiscoveryLock();
         }
+
+        // Register printers AFTER releasing the lock
+        foreach (string currentIp in currentIps)
+        {
+            _logger.LogDebug("Registering discovered printer with IP: {IP}", currentIp);
+            _printServer.RegisterPrinter(currentIp);
+        }
+
+        if (configChanged)
+        {
+            _logger.LogInformation("Discovered printer configuration changed: {Count} printer(s)", printers.Count);
+            await _receiver.OnPrintersDiscoveredAsync(printers.AsReadOnly());
+        }
     }
 
     private bool HasConfigurationChanged(HashSet<string> currentIps)

EpsonPrintService/config.txt

@@ -1 +1 @@
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+aHR0cHM6Ly9hcGkuZGV2Lmdhc3Ryb2phbWVzLmNoOzY4ODc1MjY2MTcxMjgxN2RlMjcxNTlmMjtGTEVEL1phQ2F5a0NrdEpCOHZzN1lqVFNyaStleGdKVWIva21WWk1lUHBNPQ==