From 63a5f089630307d174783f6981615e5593dbc3f3 Mon Sep 17 00:00:00 2001
From: Timo Niemann <timo.niemann@siemens.com>
Date: Thu, 4 Jun 2026 11:40:09 +0200
Subject: [PATCH] added a response tester which spams 2048 indexed ping
 commands and measures the latency between send to receive

---
 response_tester.cs | 101 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 response_tester.cs

diff --git a/response_tester.cs b/response_tester.cs
new file mode 100644
index 0000000..ec1a150
--- /dev/null
+++ b/response_tester.cs
@@ -0,0 +1,101 @@
+#:package System.IO.Ports@10.0.8
+#:property LangVersion=latest
+#:property Nullable=enable
+
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using System.IO.Ports;
+
+namespace ResponseTester
+{
+    class Program
+    {
+        private static int spamCounter = 2048;
+
+        static private Dictionary<string, DateTime> commands = Enumerable.Range(1, spamCounter).ToDictionary(i => $"{i}:ping\n", i => DateTime.MaxValue);
+        static private Dictionary<string, DateTime> responses = new Dictionary<string, DateTime>();
+
+        static private void SerialReader(SerialPort serialPort, CancellationToken ct)
+        {
+            var responseCounter = 0;
+            var timeout = DateTime.Now.AddSeconds(10);
+            while (!ct.IsCancellationRequested && responseCounter < spamCounter && DateTime.Now < timeout)
+            {
+                try
+                {
+                    var response = serialPort.ReadLine();
+                    responses[response] = DateTime.Now;
+                    Console.WriteLine($"Received response: {response.Trim()}");
+                    responseCounter++;
+                }
+                catch (TimeoutException)
+                {
+                    // Ignore timeout exceptions
+                }
+            }
+        }
+
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Starting response tester...");
+
+            var portName = "COM30";
+            var baudrate = 115200;
+
+            using var serialPort = new SerialPort(portName, baudrate, Parity.None, 8, StopBits.One);
+            serialPort.ReadTimeout = 100;
+            serialPort.DtrEnable = true;          // ← neu
+            serialPort.RtsEnable = true;          // ← neu (manche Stacks brauchen es)
+            serialPort.NewLine = "\n";            // ← neu, sonst erwartet ReadLine "\r\n"
+            try
+            {
+                serialPort.Open();
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Failed to open serial port: {ex.Message}");
+                return;
+            }
+
+            CancellationTokenSource cts = new();
+            var task = Task.Run(() => SerialReader(serialPort, cts.Token), cts.Token);
+
+            var burst = 16;
+            var counter = 0;
+            foreach(var command in commands.Keys.ToList())
+            {
+                serialPort.Write(command);
+                commands[command] = DateTime.Now;
+                Console.WriteLine($"Sent command: {command.Trim()}");
+                
+                counter++;
+                if (counter % burst == 0)                {
+                    Thread.Sleep(10);
+                }
+            }
+
+            task.Wait();
+            cts.Dispose();
+
+            var latencies = new List<TimeSpan>();
+            foreach(var command in commands)
+            {
+                var prefix = command.Key.Split(':')[0] + ":";
+                var response = responses.Keys.FirstOrDefault(r => r.StartsWith(prefix));
+                if (response != null)
+                {
+                    var latency = responses[response] - command.Value;
+                    latencies.Add(latency);
+                    Console.WriteLine($"Command: {command.Key.Trim()} | Response: {response.Trim()} | Latency: {latency.TotalMilliseconds} ms");
+                }
+                else Console.WriteLine($"Command: {command.Key.Trim()} | Response: No response received");
+            }
+
+            var averageLatency = latencies.Count > 0 ? TimeSpan.FromMilliseconds(latencies.Average(l => l.TotalMilliseconds)) : TimeSpan.Zero;
+            Console.WriteLine($"Average Latency: {averageLatency.TotalMilliseconds} ms");
+        }
+    }
+}
\ No newline at end of file