Add custom log handler and expand demo node coverage

Replace default Qt message pattern with a custom handler that matches
open62541 server log format: timestamps with UTC offset, colored
type/category tags padded to 20 chars, and shortened category names.

Add sbyte, byte, datetime, guid, and bytestring node types to all
three demo pages. Add Guid type coercion to writeValue.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/OpcUaMonitoredNode.cpp b/src/OpcUaMonitoredNode.cpp
index 1a2da86..cd93730 100644
--- a/src/OpcUaMonitoredNode.cpp
+++ b/src/OpcUaMonitoredNode.cpp
@@ -9,6 +9,7 @@
 #include <QOpcUaLocalizedText>
 #include <QOpcUaMonitoringParameters>
 #include <QStringList>
+#include <QUuid>
 
 OpcUaMonitoredNode::OpcUaMonitoredNode (QObject *parent) : QObject (parent) {}
 
@@ -451,6 +452,11 @@ OpcUaMonitoredNode::coerceValue (const QVariant &input) const
       }
     case QOpcUa::ByteString:
       return QVariant::fromValue (input.toByteArray ());
+    case QOpcUa::Guid:
+      {
+        QUuid uuid (input.toString ());
+        return !uuid.isNull () ? QVariant::fromValue (uuid) : QVariant{};
+      }
     default:
       return input;
     }