refactor(sntp): neutral commissioning-profile names without wire change

Services/SntpClockService.cs

@@ -228,8 +228,8 @@ private async Task StartCoreAsync(SntpNetworkBinding binding, CancellationToken
             SetState(
                 SntpClockServiceState.Serving,
                 binding.DirectedBroadcast == null
-                    ? $"SNTP UDP server active on {binding.LocalAddress}:123 with SIPROTEC compatibility stratum {_profile.Stratum}. No usable directed broadcast is available."
-                    : $"SNTP UDP server active on {binding.LocalAddress}:123 with SIPROTEC compatibility stratum {_profile.Stratum}; Mode 5 broadcast targets {binding.DirectedBroadcast}:123.");
+                    ? $"SNTP UDP server active on {binding.LocalAddress}:123 with commissioning compatibility stratum {_profile.Stratum}. No usable directed broadcast is available."
+                    : $"SNTP UDP server active on {binding.LocalAddress}:123 with commissioning compatibility stratum {_profile.Stratum}; Mode 5 broadcast targets {binding.DirectedBroadcast}:123.");
 
             _receiveTask = ReceiveLoopAsync(udp, serviceCancellation.Token);
             _broadcastTask = BroadcastLoopAsync(binding, serviceCancellation.Token);

Services/SntpPacket.cs

@@ -170,15 +170,15 @@ public readonly record struct SntpClientRequest(
 public sealed record SntpServerProfile
 {
     /// <summary>
-    /// SIPROTEC compatibility advertisement used by ARSAS commissioning Clock Sync.
-    /// Field experience with SIPROTEC requires a trusted-looking low stratum; stratum 2
+    /// Commissioning compatibility advertisement used by ARSAS Clock Sync.
+    /// Field experience with IED requires a trusted-looking low stratum; stratum 2
     /// is deliberately used instead of stratum 1 so ARSAS does not claim to be a primary
     /// GPS/PTP/atomic reference. ReferenceId remains LOCL and diagnostics state that the
     /// laptop clock is a local commissioning source, not a traceable grandmaster.
     /// </summary>
-    public const byte SiprotecCompatibilityStratum = 2;
+    public const byte CommissioningCompatibilityStratum = 2;
 
-    public byte Stratum { get; init; } = SiprotecCompatibilityStratum;
+    public byte Stratum { get; init; } = CommissioningCompatibilityStratum;
     public byte LeapIndicator { get; init; }
     public sbyte PollExponent { get; init; } = 6;
     public sbyte PrecisionExponent { get; init; } = -10;

docs/SNTP_CLOCK_SYNC.md

@@ -14,7 +14,7 @@ ARSAS includes a small clean-room SNTPv4 commissioning service for station-bus w
 - Sends an immediate SNTPv4 Mode 5 directed broadcast, then repeats every 64 seconds by default when a usable directed-broadcast address exists.
 - Sends another immediate broadcast when a newly connected IED is observed.
 - Separately records `broadcast sent`, `client request seen`, and `Mode 4 reply sent` evidence.
-- Advertises synchronized commissioning packets with SIPROTEC compatibility `stratum 2` and reference ID `LOCL`.
+- Advertises synchronized commissioning packets with commissioning compatibility `stratum 2` and reference ID `LOCL`.
 - Performs a wall-clock sanity/step check. A large time step suppresses broadcast and makes that instant's unicast reply RFC-style unsynchronized (`LI=3`, `stratum=0`, `INIT`, server timestamps zero).
 - Never fails an IEC 61850 association when SNTP cannot start.
 
@@ -29,11 +29,11 @@ FAT Clock Sync telemetry intentionally distinguishes packet activity from actual
 
 A broadcast without a client request may still be valid when the relay is explicitly configured for broadcast NTP, but ARSAS does not treat it as an acknowledgement. For unicast SNTP, the strongest wire-level evidence is a Mode 3 request followed by a Mode 4 reply. Device-side time-quality or clock evidence is still required before declaring the relay synchronized.
 
-## SIPROTEC compatibility stratum
+## Commissioning compatibility stratum
 
-Field commissioning has shown that a conservative high-stratum local source can be rejected or remain marked unsynchronized on some SIPROTEC installations. ARSAS therefore uses `stratum 2` for both Mode 4 replies and Mode 5 broadcasts.
+Authorized field observations on the historical reference configuration showed that a conservative high-stratum local source could be rejected or remain marked unsynchronized. ARSAS therefore uses the same `stratum 2` advertisement for Mode 4 replies and Mode 5 broadcasts. This is a bounded commissioning default, not a claim about all IEDs. The original device-specific naming and observation context remain traceable in the [pre-migration source revision](https://github.com/masarray/arsas/commit/e03ff1caa7d83902ef106f0c4aafdc3fb24143e5).
 
-The value is named in code as `SntpServerProfile.SiprotecCompatibilityStratum` and is protected by regression tests. It does not claim that the Windows laptop is physically traceable to a stratum-1 GNSS/PTP/atomic source. `LOCL` remains the reference ID and ARSAS diagnostics describe the laptop as a local commissioning source.
+The value is named in code as `SntpServerProfile.CommissioningCompatibilityStratum` and is protected by regression tests. It does not claim that the Windows laptop is physically traceable to a stratum-1 GNSS/PTP/atomic source. `LOCL` remains the reference ID and ARSAS diagnostics describe the laptop as a local commissioning source.
 
 If the Windows clock fails the ARSAS clock-health guard, synchronized stratum is not advertised: the affected unicast response becomes unsynchronized (`LI=3`, `stratum=0`, `INIT`) and broadcast is suppressed.
 
@@ -75,7 +75,7 @@ If another connected IED routes through a different local IPv4 interface, ARSAS
 - version/poll field copy behavior;
 - Mode 4 reply semantics;
 - originate timestamp echo;
-- SIPROTEC compatibility stratum 2 on unicast and broadcast packets;
+- commissioning compatibility stratum 2 on unicast and broadcast packets;
 - Mode 5 broadcast semantics;
 - RFC-style unsynchronized response fields;
 - directed-broadcast calculation;

tests/ARSAS.Tests/SntpEthernetFrameCodecTests.cs

@@ -46,7 +46,7 @@ public void Mode3RawFrame_IsParsed_AndMode4ReplySwapsEndpointsWithValidChecksums
 
         var payload = reply.AsSpan(udpOffset + 8, SntpPacket.MinimumLength);
         Assert.Equal(4, payload[0] & 0x07);
-        Assert.Equal(SntpServerProfile.SiprotecCompatibilityStratum, payload[1]);
+        Assert.Equal(SntpServerProfile.CommissioningCompatibilityStratum, payload[1]);
         Assert.Equal(requestPayload.AsSpan(40, 8).ToArray(), payload.Slice(24, 8).ToArray());
     }
 

tests/ARSAS.Tests/SntpPacketTests.cs

@@ -24,24 +24,24 @@ public void ClientRequest_IsRecognized_AndReplyCopiesVersionPollAndOriginateTime
 
         Assert.Equal(4, reply[0] & 0x07);
         Assert.Equal(4, (reply[0] >> 3) & 0x07);
-        Assert.Equal(SntpServerProfile.SiprotecCompatibilityStratum, reply[1]);
+        Assert.Equal(SntpServerProfile.CommissioningCompatibilityStratum, reply[1]);
         Assert.Equal(9, unchecked((sbyte)reply[2]));
         Assert.Equal(request.AsSpan(40, 8).ToArray(), reply.AsSpan(24, 8).ToArray());
         Assert.InRange((SntpPacket.ReadTimestamp(reply.AsSpan(32, 8), receive) - receive).Duration(), TimeSpan.Zero, TimeSpan.FromTicks(2));
         Assert.InRange((SntpPacket.ReadTimestamp(reply.AsSpan(40, 8), transmit) - transmit).Duration(), TimeSpan.Zero, TimeSpan.FromTicks(2));
     }
 
     [Fact]
-    public void Broadcast_IsMode5_AndUsesSiprotecCompatibilityStratum()
+    public void Broadcast_IsMode5_AndUsesCommissioningCompatibilityStratum()
     {
         var now = new DateTimeOffset(2026, 8, 13, 2, 3, 4, TimeSpan.Zero);
         var packet = SntpPacket.BuildBroadcast(now, new SntpServerProfile());
 
         Assert.Equal(SntpPacket.MinimumLength, packet.Length);
         Assert.Equal(5, packet[0] & 0x07);
         Assert.Equal(4, (packet[0] >> 3) & 0x07);
-        Assert.Equal((byte)2, SntpServerProfile.SiprotecCompatibilityStratum);
-        Assert.Equal(SntpServerProfile.SiprotecCompatibilityStratum, packet[1]);
+        Assert.Equal((byte)2, SntpServerProfile.CommissioningCompatibilityStratum);
+        Assert.Equal(SntpServerProfile.CommissioningCompatibilityStratum, packet[1]);
         Assert.Equal(6, unchecked((sbyte)packet[2]));
         Assert.Equal("LOCL", System.Text.Encoding.ASCII.GetString(packet, 12, 4));
         Assert.InRange((SntpPacket.ReadTimestamp(packet.AsSpan(40, 8), now) - now).Duration(), TimeSpan.Zero, TimeSpan.FromTicks(2));