Omit write-only attributes in wildcard processing

examples/all-clusters-app/all-clusters-common/all-clusters-app.matter

@@ -3708,6 +3708,7 @@ server cluster TestCluster = 4294048773 {
   attribute nullable int8s nullableRangeRestrictedInt8s = 16423;
   attribute nullable int16u nullableRangeRestrictedInt16u = 16424;
   attribute nullable int16s nullableRangeRestrictedInt16s = 16425;
+  attribute int8u writeOnlyInt8u = 16426;
   readonly attribute bitmap32 featureMap = 65532;
   readonly attribute int16u clusterRevision = 65533;
 
@@ -4772,6 +4773,7 @@ endpoint 1 {
     ram      attribute nullableRangeRestrictedInt8s default = -20;
     ram      attribute nullableRangeRestrictedInt16u default = 200;
     ram      attribute nullableRangeRestrictedInt16s default = -100;
+    callback attribute writeOnlyInt8u;
     ram      attribute featureMap;
     ram      attribute clusterRevision default = 1;
   }

examples/all-clusters-app/all-clusters-common/all-clusters-app.zap

@@ -20700,6 +20700,22 @@
               "maxInterval": 65534,
               "reportableChange": 0
             },
+            {
+              "name": "write_only_int8u",
+              "code": 16426,
+              "mfgCode": null,
+              "side": "server",
+              "type": "int8u",
+              "included": 1,
+              "storageOption": "External",
+              "singleton": 0,
+              "bounded": 0,
+              "defaultValue": "0",
+              "reportable": 1,
+              "minInterval": 1,
+              "maxInterval": 65534,
+              "reportableChange": 0
+            },
             {
               "name": "AttributeList",
               "code": 65531,
@@ -24724,5 +24740,6 @@
       "endpointVersion": 1,
       "deviceIdentifier": 61442
     }
-  ]
+  ],
+  "log": []
 }

src/app/clusters/test-cluster-server/test-cluster-server.cpp

@@ -170,6 +170,9 @@ CHIP_ERROR TestAttrAccess::Read(const ConcreteReadAttributePath & aPath, Attribu
     case ClusterErrorBoolean::Id: {
         return StatusIB(Protocols::InteractionModel::Status::Failure, 17).ToChipError();
     }
+    case WriteOnlyInt8u::Id: {
+        return StatusIB(Protocols::InteractionModel::Status::UnsupportedRead).ToChipError();
+    }
     default: {
         break;
     }

src/app/util/ember-compatibility-functions.cpp

@@ -475,6 +475,14 @@ CHIP_ERROR ReadViaAccessInterface(FabricIndex aAccessingFabricIndex, bool aIsFab
     AttributeValueEncoder valueEncoder(aAttributeReports, aAccessingFabricIndex, aPath, version, aIsFabricFiltered, state);
     CHIP_ERROR err = aAccessInterface->Read(aPath, valueEncoder);
 
+    if (err == CHIP_IM_GLOBAL_STATUS(UnsupportedRead) && aPath.mExpanded) {
+        //
+        // Set this to true to ensure our caller will return immediately without proceeding further.
+        //
+        *aTriedEncode = true;
+        return CHIP_NO_ERROR;
+    }
+
     if (err != CHIP_NO_ERROR)
     {
         // If the err is not CHIP_NO_ERROR, means the encoding was aborted, then the valueEncoder may save its state.

src/app/zap-templates/zcl/data-model/chip/test-cluster.xml

@@ -232,6 +232,8 @@ limitations under the License.
     <attribute side="server" code="0x4028" define="NULLABLE_RANGE_RESTRICTED_INT16U" type="int16u" min="100" max="1000" writable="true" isNullable="true" optional="false" default="200">nullable_range_restricted_int16u</attribute>
     <attribute side="server" code="0x4029" define="NULLABLE_RANGE_RESTRICTED_INT16S" type="int16s" min="-150" max="200" writable="true" isNullable="true" optional="false" default="-5">nullable_range_restricted_int16s</attribute>
 
+    <attribute side="server" code="0x402A" define="WRITE_ONLY_INT8U" type="INT8U" writable="true" default="0" optional="true">write_only_int8u</attribute>
+
     <!-- This attribute should not be enabled on the server side -->
     <attribute side="server" code="0x00FF" define="UNSUPPORTED" type="BOOLEAN" writable="true" optional="true">unsupported</attribute>
 

src/controller/python/test/test_scripts/cluster_objects.py

@@ -122,6 +122,14 @@ async def TestCommandWithResponse(cls, devCtrl):
         if res.returnValue != 5:
             raise ValueError()
 
+    @classmethod
+    @base.test_case
+    async def TestReadWriteOnlyAttribute(cls, devCtrl):
+        logger.info("Test wildcard read of attributes containing write-only attribute")
+        res = await devCtrl.ReadAttribute(nodeid=NODE_ID, attributes=[(Clusters.TestCluster)])
+        if Clusters.TestCluster.Attributes.WriteOnlyInt8u in res[1][Clusters.TestCluster]:
+            raise AssertionError("Received un-expected WriteOnlyInt8u attribute in TestCluster")
+
     @classmethod
     @base.test_case
     async def TestWriteRequest(cls, devCtrl):
@@ -560,6 +568,7 @@ def eventPathPossibilities():
     async def RunTest(cls, devCtrl):
         try:
             cls.TestAPI()
+            await cls.TestReadWriteOnlyAttribute(devCtrl)
             await cls.TestCommandRoundTrip(devCtrl)
             await cls.TestCommandRoundTripWithBadEndpoint(devCtrl)
             await cls.TestCommandWithResponse(devCtrl)