diff --git a/PyTado/interface/api/my_tado.py b/PyTado/interface/api/my_tado.py
index e49a4dd..ef4c4a3 100644
--- a/PyTado/interface/api/my_tado.py
+++ b/PyTado/interface/api/my_tado.py
@@ -335,7 +335,7 @@ def set_boiler_max_output_temperature(
 
     def set_flow_temperature_optimization(
         self, max_flow_temperature: float
-    ) -> FlowTemperatureOptimization:
+    ) -> SuccessResult:
         """
         Set the flow temperature optimization.
 
@@ -348,7 +348,7 @@ def set_flow_temperature_optimization(
         request.command = "flowTemperatureOptimization"
         request.payload = {"maxFlowTemperature": max_flow_temperature}
 
-        return FlowTemperatureOptimization.model_validate(self._http.request(request))
+        return SuccessResult.model_validate(self._http.request(request))
 
     def get_flow_temperature_optimization(self) -> FlowTemperatureOptimization:
         """
diff --git a/PyTado/models/line_x/device.py b/PyTado/models/line_x/device.py
index 61ac78e..d9fa830 100644
--- a/PyTado/models/line_x/device.py
+++ b/PyTado/models/line_x/device.py
@@ -38,6 +38,7 @@ class DevicesRooms(Base):
     devices: list[Device]
     zone_controller_assignable: bool | None = None
     zone_controllers: list[Any] | None = None
+    room_link_available: bool | None = None
 
     @model_validator(mode="after")
     def set_device_room(self) -> Self:
diff --git a/tests/fixtures/set_flow_temperature_optimization_issue_143.json b/tests/fixtures/get_flow_temperature_optimization_issue_143.json
similarity index 100%
rename from tests/fixtures/set_flow_temperature_optimization_issue_143.json
rename to tests/fixtures/get_flow_temperature_optimization_issue_143.json
diff --git a/tests/fixtures/tadox/rooms_and_devices.json b/tests/fixtures/tadox/rooms_and_devices.json
index 077944c..9da7eb9 100644
--- a/tests/fixtures/tadox/rooms_and_devices.json
+++ b/tests/fixtures/tadox/rooms_and_devices.json
@@ -1,64 +1,66 @@
 {
-    "otherDevices": [
-      {
-        "connection": {
-          "state": "CONNECTED"
-        },
-        "firmwareVersion": "245.1",
-        "serialNumber": "IB1234567890",
-        "type": "IB02"
-      }
-    ],
-    "rooms": [
-      {
-        "deviceManualControlTermination": {
-          "durationInSeconds": null,
-          "type": "MANUAL"
-        },
-        "devices": [
-          {
-            "batteryState": "NORMAL",
-            "childLockEnabled": false,
-            "connection": {
-              "state": "CONNECTED"
-            },
-            "firmwareVersion": "243.1",
-            "mountingState": "CALIBRATED",
-            "serialNumber": "VA1234567890",
-            "temperatureAsMeasured": 17.00,
-            "temperatureOffset": 0.0,
-            "type": "VA04"
-          }
-        ],
-        "roomId": 1,
-        "roomName": "Room 1",
-        "zoneControllerAssignable": false,
-        "zoneControllers": []
+  "otherDevices": [
+    {
+      "connection": {
+        "state": "CONNECTED"
       },
-      {
-        "deviceManualControlTermination": {
-          "durationInSeconds": null,
-          "type": "MANUAL"
-        },
-        "devices": [
-          {
-            "batteryState": "NORMAL",
-            "childLockEnabled": false,
-            "connection": {
-              "state": "CONNECTED"
-            },
-            "firmwareVersion": "243.1",
-            "mountingState": "CALIBRATED",
-            "serialNumber": "VA1234567891",
-            "temperatureAsMeasured": 18.00,
-            "temperatureOffset": 0.0,
-            "type": "VA04"
-          }
-        ],
-        "roomId": 2,
-        "roomName": " Room 2",
-        "zoneControllerAssignable": false,
-        "zoneControllers": []
-      }
-    ]
-  }
+      "firmwareVersion": "245.1",
+      "serialNumber": "IB1234567890",
+      "type": "IB02"
+    }
+  ],
+  "rooms": [
+    {
+      "deviceManualControlTermination": {
+        "durationInSeconds": null,
+        "type": "MANUAL"
+      },
+      "devices": [
+        {
+          "batteryState": "NORMAL",
+          "childLockEnabled": false,
+          "connection": {
+            "state": "CONNECTED"
+          },
+          "firmwareVersion": "243.1",
+          "mountingState": "CALIBRATED",
+          "serialNumber": "VA1234567890",
+          "temperatureAsMeasured": 17.00,
+          "temperatureOffset": 0.0,
+          "type": "VA04"
+        }
+      ],
+      "roomId": 1,
+      "roomName": "Room 1",
+      "zoneControllerAssignable": false,
+      "zoneControllers": [],
+      "roomLinkAvailable": true
+    },
+    {
+      "deviceManualControlTermination": {
+        "durationInSeconds": null,
+        "type": "MANUAL"
+      },
+      "devices": [
+        {
+          "batteryState": "NORMAL",
+          "childLockEnabled": false,
+          "connection": {
+            "state": "CONNECTED"
+          },
+          "firmwareVersion": "243.1",
+          "mountingState": "CALIBRATED",
+          "serialNumber": "VA1234567891",
+          "temperatureAsMeasured": 18.00,
+          "temperatureOffset": 0.0,
+          "type": "VA04"
+        }
+      ],
+      "roomId": 2,
+      "roomName": " Room 2",
+      "zoneControllerAssignable": false,
+      "zoneControllers": [],
+      "roomLinkAvailable": true
+    }
+  ]
+}
diff --git a/tests/test_my_tado.py b/tests/test_my_tado.py
index c9f2ff4..07e896b 100644
--- a/tests/test_my_tado.py
+++ b/tests/test_my_tado.py
@@ -157,9 +157,7 @@ def test_set_flow_temperature_optimization(self):
         """Test the set_flow_temperature_optimization method."""
         with mock.patch(
             "PyTado.http.Http.request",
-            return_value=json.loads(
-                common.load_fixture("set_flow_temperature_optimization_issue_143.json")
-            ),
+            return_value={"success": True},
         ):
             # Set max flow temperature to 50°C
             self.tado_client.set_flow_temperature_optimization(50)
@@ -178,7 +176,7 @@ def test_get_flow_temperature_optimization(self):
             responses.GET,
             "https://my.tado.com/api/v2/homes/1234/flowTemperatureOptimization",
             json=json.loads(
-                common.load_fixture("set_flow_temperature_optimization_issue_143.json")
+                common.load_fixture("get_flow_temperature_optimization_issue_143.json")
             ),
             status=200,
         )