fix(dcl): map OPC UA status by severity bits so all Good subcodes are Good (ScadaBridge#117)

MapStatusCode returned Uncertain for any non-zero non-Bad code, so GoodLocalOverride,
GoodClamped and info-bit Good variants degraded to Uncertain. Now top two bits decide:
00 Good, 01 Uncertain, 10/11 Bad (BadResourceUnavailable stays Bad, #112 untouched).
The SDK IsGood/IsUncertain(uint) helpers were tried first and failed the subcode tests,
so an explicit mask is used. MxGateway mapper uses the OPC-DA quality byte (>=192 Good)
and is not affected.

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV

src/ZB.MOM.WW.ScadaBridge.DataConnectionLayer/Adapters/OpcUaDataConnection.cs

@@ -528,13 +528,20 @@ public class OpcUaDataConnection
     }
 
     /// <summary>
-    /// Maps OPC UA StatusCode to QualityCode.
-    /// StatusCode 0 = Good, high bit set = Bad, otherwise Uncertain.
+    /// Maps an OPC UA StatusCode to QualityCode by its severity bits (top two bits: 00 Good,
+    /// 01 Uncertain, 10/11 Bad), so every Good subcode (GoodLocalOverride, GoodClamped, info-bit
+    /// variants, ...) is Good (ScadaBridge#117). BadResourceUnavailable is a plain Bad here
+    /// (ScadaBridge#112 handles it separately and never as a connection fault).
     /// </summary>
-    private static QualityCode MapStatusCode(uint statusCode)
+    internal static QualityCode MapStatusCode(uint statusCode)
     {
-        if (statusCode == 0) return QualityCode.Good;
-        if ((statusCode & 0x80000000) != 0) return QualityCode.Bad;
-        return QualityCode.Uncertain;
+        // Explicit severity mask: the SDK's StatusCode.IsGood/IsUncertain(uint) helpers did not
+        // treat Good subcodes / info-bit variants as Good in the pinned SDK (tests prove it).
+        return (statusCode & 0xC0000000u) switch
+        {
+            0x00000000u => QualityCode.Good,
+            0x40000000u => QualityCode.Uncertain,
+            _ => QualityCode.Bad,
+        };
     }
 }

tests/ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests/OpcUaStatusCodeMappingTests.cs

@@ -0,0 +1,24 @@
+using Opc.Ua;
+using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Protocol;
+using ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Adapters;
+
+namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests;
+
+/// <summary>ScadaBridge#117: quality follows the StatusCode severity bits, not "== 0".</summary>
+public class OpcUaStatusCodeMappingTests
+{
+    [Theory]
+    [InlineData(StatusCodes.Good, QualityCode.Good)]
+    [InlineData(StatusCodes.GoodLocalOverride, QualityCode.Good)]
+    [InlineData(StatusCodes.GoodClamped, QualityCode.Good)]
+    [InlineData(StatusCodes.Good | 0x0480u, QualityCode.Good)] // info bits set
+    [InlineData(StatusCodes.Uncertain, QualityCode.Uncertain)]
+    [InlineData(StatusCodes.UncertainLastUsableValue, QualityCode.Uncertain)]
+    [InlineData(StatusCodes.UncertainSensorNotAccurate, QualityCode.Uncertain)]
+    [InlineData(StatusCodes.Bad, QualityCode.Bad)]
+    [InlineData(StatusCodes.BadNodeIdUnknown, QualityCode.Bad)]
+    [InlineData(StatusCodes.BadResourceUnavailable, QualityCode.Bad)]
+    [InlineData(0xC0000000u, QualityCode.Bad)]
+    public void MapStatusCode_UsesSeverityBits(uint code, QualityCode expected) =>
+        Assert.Equal(expected, OpcUaDataConnection.MapStatusCode(code));
+}