test: Add ReadClock test

S7.Net.UnitTest/CommunicationTests/ReadClock.cs

@@ -0,0 +1,130 @@
+using System;
+using System.Net;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using S7.Net.Protocol;
+
+namespace S7.Net.UnitTest.CommunicationTests;
+
+[TestClass]
+public class ReadClock
+{
+    [TestMethod, Timeout(500)]
+    public async Task Read_Clock_Value()
+    {
+        var cs = new CommunicationSequence
+        {
+            ConnectionOpenTemplates.ConnectionRequestConfirm,
+            ConnectionOpenTemplates.CommunicationSetup,
+            {
+                """
+                    // TPKT
+                    03 00 00 1d
+
+                    // COTP
+                    02 f0 80
+
+                    // S7 read clock
+                    // UserData header
+                    32 07 00 00 07 00
+                    // Parameter length
+                    00 08
+                    // Data length
+                    00 04
+
+                    // Parameter
+                    // Head
+                    00 01 12
+                    // Length
+                    04
+                    // Method (Request/Response): Req
+                    11
+                    // Type request (4...) Function group timers (...7)
+                    47
+                    // Subfunction: read clock
+                    01
+                    // Sequence number
+                    00
+
+                    // Data
+                    0a 00 00 00
+                """,
+                """
+                    // TPKT
+                    03 00 00 2b
+
+                    // COTP
+                    02 f0 80
+
+                    // S7 read clock response
+                    // UserData header
+                    32 07 00 00 07 00
+                    // Parameter length
+                    00 0c
+                    // Data length
+                    00 0e
+
+                    // Parameter
+                    // Head
+                    00 01 12
+                    // Length
+                    08
+                    // Method (Request/Response): Res
+                    12
+                    // Type response (8...) Function group timers (...7)
+                    87
+                    // Subfunction: read clock
+                    01
+                    // Sequence number
+                    01
+                    // Data unit reference
+                    00
+                    // Last data unit? Yes
+                    00
+                    // Error code
+                    00 00
+
+                    // Data
+                    // Error code
+                    ff
+                    // Transport size: OCTET STRING
+                    09
+                    // Length
+                    00 0a
+
+                    // Timestamp
+                    // Reserved
+                    00
+                    // Year 1
+                    19
+                    // Year 2
+                    14
+                    // Month
+                    08
+                    // Day
+                    20
+                    // Hour
+                    11
+                    // Minute
+                    59
+                    // Seconds
+                    43
+                    // Milliseconds: 912..., Day of week: ...4
+                    91 24
+                """
+            }
+        };
+
+        static async Task Client(int port)
+        {
+            var conn = new Plc(IPAddress.Loopback.ToString(), port, new TsapPair(new Tsap(1, 2), new Tsap(3, 4)));
+            await conn.OpenAsync();
+            var time = await conn.ReadClockAsync();
+
+            Assert.AreEqual(new DateTime(2014, 8, 20, 11, 59, 43, 912), time);
+            conn.Close();
+        }
+
+        await Task.WhenAll(cs.Serve(out var port), Client(port));
+    }
+}