diff --git a/asusrouter/asusrouter.py b/asusrouter/asusrouter.py
index 9a869c0..bfad983 100644
--- a/asusrouter/asusrouter.py
+++ b/asusrouter/asusrouter.py
@@ -586,7 +586,7 @@ async def async_get_data(self, datatype: AsusData, force: bool = False) -> Any:
 
     async def async_run_service(
         self,
-        service: str,
+        service: Optional[str],
         arguments: Optional[dict[str, Any]] = None,
         apply: bool = False,
         expect_modify: bool = True,
diff --git a/asusrouter/modules/client.py b/asusrouter/modules/client.py
index 6bff77b..be481d6 100644
--- a/asusrouter/modules/client.py
+++ b/asusrouter/modules/client.py
@@ -23,105 +23,6 @@
     safe_unpack_key,
 )
 
-# # Map of the parameters for connected device
-# # value_to_find: [where_to_search, method to convert]
-# # List is sorted by importance with the most important first
-# MAP_CONNECTED_DEVICE: dict[str, list[SearchKey]] = {
-#     "connected_since": [
-#         SearchKey("wlConnectTime", time_from_delta),
-#     ],
-#     CONNECTION_TYPE: [
-#         SearchKey(CONNECTION_TYPE),
-#         SearchKey("isWL", int_from_str),
-#     ],
-#     GUEST: [
-#         SearchKey(GUEST),
-#         SearchKey("isGN", int_from_str),
-#     ],
-#     "internet_mode": [
-#         SearchKey("internetMode"),
-#     ],
-#     "internet_state": [
-#         SearchKey("internetState", bool_from_any),
-#     ],
-#     IP: [
-#         SearchKey(IP),
-#     ],
-#     "ip_method": [
-#         SearchKey("ipMethod"),
-#     ],
-#     MAC: [
-#         SearchKey(MAC),
-#     ],
-#     NAME: [
-#         SearchKey("nickName"),
-#         SearchKey(NAME),
-#         SearchKey(MAC),
-#     ],
-#     NODE: [
-#         SearchKey(NODE),
-#     ],
-#     ONLINE: [
-#         SearchKey(ONLINE),
-#         SearchKey("isOnline", bool_from_any),
-#     ],
-#     RSSI: [
-#         SearchKey(RSSI, int_from_str),
-#     ],
-#     "rx_speed": [
-#         SearchKey("curRx", float_from_str),
-#     ],
-#     "tx_speed": [
-#         SearchKey("curTx", float_from_str),
-#     ],
-# }
-
-
-# List of available attributes for a device:
-#
-# "amesh_bind_band": "0",
-# "amesh_bind_mac": "",
-# "amesh_isRe": "0",
-# "amesh_isReClient": "1",
-# "amesh_papMac": "7C:10:C9:03:6D:90",
-# "callback": "",
-# "curRx": "        ",
-# "curTx": "1",
-# "defaultType": "0",
-# "dpiDevice": "",
-# "dpiType": "",
-# "group": "",
-# "internetMode": "block",
-# "internetState": 0,
-# "ip": "192.168.55.112",
-# "ipMethod": "Manual",
-# "isGN": "",
-# "isGateway": "0",
-# "isITunes": "0",
-# "isLogin": "0",
-# "isOnline": "1",
-# "isPrinter": "0",
-# "isWL": "1",
-# "isWebServer": "0",
-# "keeparp": "",
-# "mac": "E0:98:06:C4:25:92",
-# "macRepeat": "0",
-# "name": "Espressif Inc ",
-# "nickName": "Fr/Socket/Bookshelf",
-# "opMode": "0",
-# "os_type": 0,
-# "qosLevel": "",
-# "ROG": "0",
-# "rssi": "-55",
-# "ssid": "",
-# "totalRx": "",
-# "totalTx": "",
-# "type": "0",
-# "vendor": "Espressif Inc.",
-# "vendorclass": "Espressif Inc.",
-# "wtfast": "0",
-# "wlConnectTime": "00:00:03"
-
 
 @dataclass
 class AsusClient:
diff --git a/asusrouter/modules/service.py b/asusrouter/modules/service.py
index b1de672..944c9a6 100644
--- a/asusrouter/modules/service.py
+++ b/asusrouter/modules/service.py
@@ -13,7 +13,7 @@
 
 async def async_call_service(
     callback: Callable[..., Awaitable[dict[str, Any]]],
-    service: str,
+    service: Optional[str],
     arguments: Optional[dict[str, Any]] = None,
     apply: bool = False,
     expect_modify: bool = True,
@@ -21,9 +21,11 @@ async def async_call_service(
     """Call a service."""
 
     # Generate commands
-    commands = {
-        "rc_service": service,
-    }
+    commands = {}
+
+    # Service call provided
+    if service is not None:
+        commands["rc_service"] = service
 
     # Check arguments
     if not arguments:
@@ -42,9 +44,11 @@ async def async_call_service(
     except Exception as ex:  # pylint: disable=broad-except
         raise ex
 
-    run_service = result.get("run_service", None)
-    if run_service != service:
-        raise AsusRouterServiceError(f"Service not run. Raw result: {result}")
+    if service is not None:
+        # Check if the service is run
+        run_service = result.get("run_service", None)
+        if run_service != service:
+            raise AsusRouterServiceError(f"Service not run. Raw result: {result}")
 
     _LOGGER.debug(
         "Service `%s` run with arguments `%s`. Result: `%s`", service, arguments, result
@@ -59,6 +63,10 @@ async def async_call_service(
     if needed_time is None and last_id is not None:
         needed_time = 5
 
+    # Special services that won't return any result
+    if arguments.get("action_mode") == "update_client_list":
+        return (True, needed_time, last_id)
+
     if expect_modify:
         return (safe_bool(result.get("modify")) or False, needed_time, last_id)
 
diff --git a/asusrouter/modules/system.py b/asusrouter/modules/system.py
index ea349e9..2782d37 100644
--- a/asusrouter/modules/system.py
+++ b/asusrouter/modules/system.py
@@ -13,6 +13,7 @@ class AsusSystem(str, Enum):
     RESTART_FIREWALL = "restart_firewall"
     RESTART_HTTPD = "restart_httpd"
     RESTART_WIRELESS = "restart_wireless"
+    UPDATE_CLIENTS = "update_clients"
 
 
 async def set_state(
@@ -28,6 +29,15 @@ async def set_state(
     if not arguments:
         arguments = {}
 
+    # Special cases
+    if state == AsusSystem.UPDATE_CLIENTS:
+        return await callback(
+            service=None,
+            arguments={"action_mode": "update_client_list"},
+            apply=False,
+            expect_modify=False,
+        )
+
     # Run the service
     return await callback(
         service=state.value,
diff --git a/tests/modules/test_service.py b/tests/modules/test_service.py
index 5f4fb45..25fdc00 100644
--- a/tests/modules/test_service.py
+++ b/tests/modules/test_service.py
@@ -44,9 +44,18 @@ async def callback(arguments: dict[str, str]) -> dict[str, str]:
             None,
         ),  # Don't apply, don't expect
         ("restart_httpd", {"id": "1"}, True, True, True, 5, 1),  # Provided ID
+        (
+            None,
+            {"action_mode": "update_client_list"},
+            False,
+            False,
+            True,
+            None,
+            None,
+        ),  # Special service
     ],
 )
-async def test_async_call_service(
+async def test_async_call_service(  # pylint: disable=too-many-arguments
     service,
     arguments,
     apply,
@@ -80,7 +89,7 @@ async def test_async_call_service(
 async def test_async_call_service_failing_callback(exception):
     """Test the async_call_service method with a failing callback."""
 
-    async def failing_callback(arguments):
+    async def failing_callback(_):
         raise exception("Test exception")
 
     with pytest.raises(exception):
@@ -91,7 +100,7 @@ async def failing_callback(arguments):
 async def test_async_call_service_with_invalid_service():
     """Test the async_call_service method with an invalid service."""
 
-    async def invalid_callback(arguments):
+    async def invalid_callback(_):
         return {"run_service": "invalid_service"}
 
     with pytest.raises(AsusRouterServiceError):