MCORE-FS-1.4: Wait for dynamic endpoint to appear on TH_FSA (#36013)

* MCORE-FS-1.4: Wait for dynamic endpoint to appear on TH_FSA

Fixes #35348

* Timeout for getting dynamic endpoint

Author: arkq

src/python_testing/TC_MCORE_FS_1_4.py

@@ -94,9 +94,7 @@ def start(self):
         super().start(expected_output="Successfully opened pairing window on the device")
 
     def commission_on_network(self, node_id: int, setup_pin_code: int, filter_type=None, filter=None):
-        self.send(
-            f"pairing onnetwork {node_id} {setup_pin_code}",
-            expected_output=f"Commissioning complete for node ID {node_id:#018x}: success")
+        self.send(f"pairing onnetwork {node_id} {setup_pin_code}")
 
 
 class TC_MCORE_FS_1_4(MatterBaseTest):
@@ -266,16 +264,19 @@ async def test_TC_MCORE_FS_1_4(self):
             filter=discriminator,
         )
 
-        # Wait some time, so the dynamic endpoint will appear on the TH_FSA_BRIDGE.
-        await asyncio.sleep(5)
-
-        # Get the list of endpoints on the TH_FSA_BRIDGE after adding the TH_SERVER_NO_UID.
-        th_fsa_bridge_endpoints_new = set(await self.read_single_attribute_check_success(
-            cluster=Clusters.Descriptor,
-            attribute=Clusters.Descriptor.Attributes.PartsList,
-            node_id=th_fsa_bridge_th_node_id,
-            endpoint=0,
-        ))
+        get_dynamic_endpoint_retries = 60
+        th_fsa_bridge_endpoints_new = set(th_fsa_bridge_endpoints)
+        # Try to get the dynamic endpoint number for the TH_SERVER_NO_UID on the TH_FSA_BRIDGE.
+        while th_fsa_bridge_endpoints_new == th_fsa_bridge_endpoints and get_dynamic_endpoint_retries > 0:
+            await asyncio.sleep(0.5)
+            get_dynamic_endpoint_retries -= 1
+            # Get the list of endpoints on the TH_FSA_BRIDGE.
+            th_fsa_bridge_endpoints_new.update(await self.read_single_attribute_check_success(
+                cluster=Clusters.Descriptor,
+                attribute=Clusters.Descriptor.Attributes.PartsList,
+                node_id=th_fsa_bridge_th_node_id,
+                endpoint=0,
+            ))
 
         # Get the endpoint number for just added TH_SERVER_NO_UID.
         logging.info("Endpoints on TH_FSA_BRIDGE: old=%s, new=%s", th_fsa_bridge_endpoints, th_fsa_bridge_endpoints_new)