open62541
Allow a single complete callback for all monitored items in one subscription
This feature is a blocker for my project. I need a single callback for performance reasons and compatibility with the UA OPC Stack that provide a FastDataChangeCallback (https://github.com/OPCFoundation/UA-.NETStandard/blob/711160e84a96606931a6737a70518e1f7b6e666d/Libraries/Opc.Ua.Client/Subscription/Subscription.cs#L454) Can this pull request be merged into the main branch?
About this PR:
The clientHandle of the UA_MonitoredItemNotification is an UInt32 and is less flexible than "void* monContext" available in the UA_Client_DataChangeNotificationCallback with the signature (UA_Client* client, UA_UInt32 subId, void* subContext, UA_UInt32 monId, void* monContext, UA_DataValue* value).
For example I was using monContext to assign a structure with the NodeId, DisplayName and SamplingInterval. Why the void* was changed to an UInt32?
UPDATE: Another improvement is to call UA_UNLOCK(&client->clientMutex); before calling dataChangeCallback() and LOCKING again after