From ca773610ad0341ee0815bd37af6e49bf118e224d Mon Sep 17 00:00:00 2001
From: EugeneTes <meelstorm@gmail.com>
Date: Thu, 3 Sep 2026 12:22:14 +0200
Subject: [PATCH] fail cleanly when a printer does not answer GS I 1

Claude-Session: https://claude.ai/code/session_01E6N3P4nSZLtp4BC2LXVref
---
 .../PrintServer/PrintServices/EpsonPrintService.cs        | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Inspectron.Epson/PrintServer/PrintServices/EpsonPrintService.cs b/Inspectron.Epson/PrintServer/PrintServices/EpsonPrintService.cs
index 7655651..c77e3a5 100644
--- a/Inspectron.Epson/PrintServer/PrintServices/EpsonPrintService.cs
+++ b/Inspectron.Epson/PrintServer/PrintServices/EpsonPrintService.cs
@@ -39,6 +39,14 @@ public class EpsonPrintService: IPrintService
 
             _logger.LogInformation("Printer ID({ip}): {PrinterId}", printerIp, printerId);
 
+            if (printerId is null)
+            {
+                _logger.LogWarning(
+                    "Printer {PrinterIp} did not answer GS I 1, so its model is unknown; " +
+                    "cannot choose a printer adapter", printerIp);
+                return PrintResult.Fail(PrintErrorType.Other);
+            }
+
             var status = await epsonPrinter.GetPrinterStatusAsync();
             if (!status.IsOnline)
             {