Also add client to monitoredEvent callback

CHANGELOG

 This changelog reports changes to the public API. Internal refactorings and bug
 fixes are not reported here.
 
+2018-02-05 pro <profanter at fortiss.org>
+
+ * Also pass client to monitoredItem/Events callback
+
+   The UA_MonitoredItemHandlingFunction and UA_MonitoredEventHandlingFunction
+   did not include a reference to the corresponding client used for the call of
+   processPublishResponse.
+   This now also allows to get the client context within the monitored item
+   handling function.
+
+   The API changes are detected by the type-matching in the compiler. So there
+   is little risk for bugs due to unaligned implementations.
+
 2017-09-07 jpfr <julius.pfrommer at web.de>
 
  * Make Client Highlevel Interface consistent

examples/tutorial_client_events.c

@@ -14,7 +14,8 @@ static void stopHandler(int sig) {
 #ifdef UA_ENABLE_SUBSCRIPTIONS
 
 static void
-handler_events(const UA_UInt32 monId, const size_t nEventFields,
+handler_events(UA_Client *client,
+               const UA_UInt32 monId, const size_t nEventFields,
                const UA_Variant *eventFields, void *context) {
     UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, "Notification");
 

include/ua_client_highlevel.h

@@ -617,7 +617,8 @@ UA_Client_Subscriptions_addMonitoredItem(UA_Client *client, UA_UInt32 subscripti
 
 /* Monitored Events have different payloads from DataChanges. So they use a
  * different callback method signature. */
-typedef void (*UA_MonitoredEventHandlingFunction)(const UA_UInt32 monId,
+typedef void (*UA_MonitoredEventHandlingFunction)(UA_Client *client,
+                                                  const UA_UInt32 monId,
                                                   const size_t nEventFields,
                                                   const UA_Variant *eventFields,
                                                   void *context);

src/client/ua_client_highlevel_subscriptions.c

@@ -458,7 +458,7 @@ UA_Client_processPublishResponse(UA_Client *client, UA_PublishRequest *request,
                     continue;
                 }
 
-                mon->handler.eventHandler(mon->monitoredItemId, eventFieldList->eventFieldsSize,
+                mon->handler.eventHandler(client, mon->monitoredItemId, eventFieldList->eventFieldsSize,
                                           eventFieldList->eventFields, mon->handlerContext);
             }
         }