Add python IM event client code

src/app/MessageDef/EventDataIB.cpp

@@ -455,10 +455,7 @@ CHIP_ERROR EventDataIB::Parser::ProcessEventTimestamp(EventHeader & aEventHeader
         hasEpochTimestamp              = true;
     }
 
-    if ((hasSystemTimestamp && !hasEpochTimestamp && !hasDeltaSystemTimestamp && !hasDeltaEpochTimestamp) ||
-        (!hasSystemTimestamp && hasEpochTimestamp && !hasDeltaSystemTimestamp && !hasDeltaEpochTimestamp) ||
-        (!hasSystemTimestamp && !hasEpochTimestamp && hasDeltaSystemTimestamp && !hasDeltaEpochTimestamp) ||
-        (!hasSystemTimestamp && !hasEpochTimestamp && !hasDeltaSystemTimestamp && hasDeltaEpochTimestamp))
+    if (hasSystemTimestamp + hasEpochTimestamp + hasDeltaSystemTimestamp + hasDeltaEpochTimestamp == 1)
     {
         return CHIP_NO_ERROR;
     }

src/app/ReadClient.h

@@ -76,11 +76,10 @@ class ReadClient : public Messaging::ExchangeDelegate
          * The ReadClient object MUST continue to exist after this call is completed.
          *
          * This callback will be called when receiving event data received in the Read and Subscribe interactions
-         *
+         * only one of the apData and apStatus will be non-null.
          * @param[in] apReadClient: The read client object that initiated the read or subscribe transaction.
          * @param[in] aEventHeader: The event header in report response.
-         * @param[in] apData: A TLVReader positioned right on the payload of the event. This will be set to null if the apStatus is
-         * not null.
+         * @param[in] apData: A TLVReader positioned right on the payload of the event.
          * @param[in] apStatus: Event-specific status, containing an InteractionModel::Status code as well as an optional
          *                     cluster-specific status code.
          */

src/app/reporting/Engine.cpp

@@ -227,14 +227,14 @@ CHIP_ERROR Engine::BuildSingleReportDataEventReports(ReportDataMessage::Builder
 
     VerifyOrExit(clusterInfoList != nullptr, );
     VerifyOrExit(apReadHandler != nullptr, err = CHIP_ERROR_INVALID_ARGUMENT);
+    // If the eventManager is not valid or has not been initialized,
+    // skip the rest of processing
+    VerifyOrExit(eventManager.IsValid(), ChipLogError(DataManagement, "EventManagement has not yet initialized"));
 
     EventReports = aReportDataBuilder.CreateEventReports();
     SuccessOrExit(err = EventReports.GetError());
 
     memcpy(initialEvents, eventNumberList, sizeof(initialEvents));
-    // If the eventManager is not valid or has not been initialized,
-    // skip the rest of processing
-    VerifyOrExit(eventManager.IsValid(), err = CHIP_ERROR_INCORRECT_STATE);
 
     for (size_t index = 0; index < kNumPriorityLevel; index++)
     {

src/controller/ReadInteraction.h

@@ -93,10 +93,11 @@ CHIP_ERROR ReadAttribute(Messaging::ExchangeManager * aExchangeMgr, const Sessio
  */
 template <typename DecodableEventTypeInfo>
 CHIP_ERROR ReadEvent(Messaging::ExchangeManager * apExchangeMgr, const SessionHandle sessionHandle, EndpointId endpointId,
-                     ClusterId clusterId, EventId eventId,
                      typename TypedReadEventCallback<DecodableEventTypeInfo>::OnSuccessCallbackType onSuccessCb,
                      typename TypedReadEventCallback<DecodableEventTypeInfo>::OnErrorCallbackType onErrorCb)
 {
+    ClusterId clusterId = DecodableEventTypeInfo::GetClusterId();
+    EventId eventId     = DecodableEventTypeInfo::GetEventId();
     app::EventPathParams eventPath(endpointId, clusterId, eventId);
     app::ReadPrepareParams readParams(sessionHandle);
     app::ReadClient * readClient         = nullptr;
@@ -150,9 +151,7 @@ CHIP_ERROR ReadEvent(Messaging::ExchangeManager * aExchangeMgr, const SessionHan
                      typename TypedReadEventCallback<typename EventTypeInfo::DecodableType>::OnSuccessCallbackType onSuccessCb,
                      typename TypedReadEventCallback<typename EventTypeInfo::DecodableType>::OnErrorCallbackType onErrorCb)
 {
-    return ReadAttribute<typename EventTypeInfo::DecodableType>(aExchangeMgr, sessionHandle, endpointId,
-                                                                EventTypeInfo::GetClusterId(), EventTypeInfo::GetEventId(),
-                                                                onSuccessCb, onErrorCb);
+    return ReadEvent<typename EventTypeInfo::DecodableType>(aExchangeMgr, sessionHandle, endpointId, onSuccessCb, onErrorCb);
 }
 } // namespace Controller
 } // namespace chip

src/controller/TypedReadCallback.h

@@ -128,12 +128,10 @@ class TypedReadEventCallback final : public app::ReadClient::Callback
     {
         CHIP_ERROR err = CHIP_NO_ERROR;
         DecodableEventTypeInfo value;
-        VerifyOrExit(aEventHeader.mPath.mClusterId == DecodableEventTypeInfo::GetClusterId() &&
-                         aEventHeader.mPath.mEventId == DecodableEventTypeInfo::GetEventId(),
-                     CHIP_ERROR_SCHEMA_MISMATCH);
+
         VerifyOrExit(apData != nullptr, err = CHIP_ERROR_INVALID_ARGUMENT);
 
-        err = app::DataModel::Decode(*apData, value);
+        err = apReadClient->DecodeEvent(aEventHeader, value, *apData);
         SuccessOrExit(err);
 
         mOnSuccess(aEventHeader, value);

src/controller/python/chip/ChipDeviceCtrl.py

@@ -486,6 +486,81 @@ async def ReadAttribute(self, nodeid: int, attributes: typing.List[typing.Union[
             raise self._ChipStack.ErrorToException(res)
         return await future
 
+    async def ReadEvent(self, nodeid: int, events: typing.List[typing.Union[
+        None,  # Empty tuple, all wildcard
+        typing.Tuple[int],  # Endpoint
+        # Wildcard endpoint, Cluster id present
+        typing.Tuple[typing.Type[ClusterObjects.Cluster]],
+        # Wildcard endpoint, Cluster + Event present
+        typing.Tuple[typing.Type[ClusterObjects.ClusterEventDescriptor]],
+        # Wildcard event id
+        typing.Tuple[int, typing.Type[ClusterObjects.Cluster]],
+        # Concrete path
+        typing.Tuple[int, typing.Type[ClusterObjects.ClusterEventDescriptor]]
+    ]], reportInterval: typing.Tuple[int, int] = None):
+        '''
+        Read a list of events from a target node
+
+        nodeId: Target's Node ID
+        events: A list of tuples of varying types depending on the type of read being requested:
+            (endpoint, Clusters.ClusterA.EventA):       Endpoint = specific,    Cluster = specific,   Event = specific
+            (endpoint, Clusters.ClusterA):              Endpoint = specific,    Cluster = specific,   Event = *
+            (Clusters.ClusterA.EventA):                 Endpoint = *,           Cluster = specific,   Event = specific
+            endpoint:                                   Endpoint = specific,    Cluster = *,          Event = *
+            Clusters.ClusterA:                          Endpoint = *,           Cluster = specific,   Event = *
+            '*' or ():                                  Endpoint = *,           Cluster = *,          Event = *
+
+        The cluster and events specified above are to be selected from the generated cluster objects.
+
+        e.g.
+            ReadEvent(1, [ 1 ] ) -- case 4 above.
+            ReadEvent(1, [ Clusters.Basic ] ) -- case 5 above.
+            ReadEvent(1, [ (1, Clusters.Basic.Events.Location ] ) -- case 1 above.
+
+        reportInterval: A tuple of two int-s for (MinIntervalFloor, MaxIntervalCeiling). Used by establishing subscriptions.
+            When not provided, a read request will be sent.
+        '''
+
+        eventLoop = asyncio.get_running_loop()
+        future = eventLoop.create_future()
+
+        device = self.GetConnectedDeviceSync(nodeid)
+        eves = []
+        for v in events:
+            endpoint = None
+            cluster = None
+            event = None
+            if v in [('*'), ()]:
+                # Wildcard
+                pass
+            elif type(v) is not tuple:
+                print(type(v))
+                if type(v) is int:
+                    endpoint = v
+                elif issubclass(v, ClusterObjects.Cluster):
+                    cluster = v
+                elif issubclass(v, ClusterObjects.ClusterEventDescriptor):
+                    event = v
+                else:
+                    raise ValueError("Unsupported Event Path")
+            else:
+                # endpoint + (cluster) event / endpoint + cluster
+                endpoint = v[0]
+                if issubclass(v[1], ClusterObjects.Cluster):
+                    cluster = v[1]
+                elif issubclass(v[1], ClusterAttribute.ClusterEventDescriptor):
+                    event = v[1]
+                else:
+                    raise ValueError("Unsupported Attribute Path")
+            eves.append(ClusterAttribute.EventPath(
+                EndpointId=endpoint, Cluster=cluster, Event=event))
+        res = self._ChipStack.Call(
+            lambda: ClusterAttribute.ReadEvents(future, eventLoop, device, self, eves, ClusterAttribute.SubscriptionParameters(reportInterval[0], reportInterval[1]) if reportInterval else None))
+        if res != 0:
+            raise self._ChipStack.ErrorToException(res)
+        outcome = await future
+        return await future
+
     def ZCLSend(self, cluster, command, nodeid, endpoint, groupid, args, blocking=False):
         req = None
         try:
@@ -507,7 +582,8 @@ def ZCLReadAttribute(self, cluster, attribute, nodeid, endpoint, groupid, blocki
         except:
             raise UnknownAttribute(cluster, attribute)
 
-        result = asyncio.run(self.ReadAttribute(nodeid, [(endpoint, req)]))
+        result = asyncio.run(self.ReadAttribute(
+            nodeid, [(endpoint, req)]))['Attributes']
         path = ClusterAttribute.AttributePath(
             EndpointId=endpoint, Attribute=req)
         return im.AttributeReadResult(path=im.AttributePath(nodeId=nodeid, endpointId=path.EndpointId, clusterId=path.ClusterId, attributeId=path.AttributeId), status=0, value=result[path].Data.value)