Do not read XNCP flow control on older radios (#659)

* Only request XNCP flow control type if the feature is supported

* Ignore XNCP for older gateways

* Add a unit test

Author: puddly

bellows/ezsp/__init__.py

@@ -180,6 +180,10 @@ async def version(self):
         )
 
     async def get_xncp_features(self) -> xncp.FirmwareFeatures:
+        # Some older gateways seem to have their own XNCP protocol. Ignore them.
+        if self._ezsp_version < 13:
+            return FirmwareFeatures.NONE
+
         try:
             self._xncp_features = await self.xncp_get_supported_firmware_features()
         except InvalidCommandError:

bellows/ezsp/xncp.py

@@ -112,8 +112,8 @@ class XncpCommandPayload(t.Struct):
 
 
 class FlowControlType(t.enum8):
-    Software = 0x00
-    Hardware = 0x01
+    SOFTWARE = 0x00
+    HARDWARE = 0x01
 
 
 @register_command(XncpCommandId.GET_SUPPORTED_FEATURES_REQ)

bellows/zigbee/application.py

@@ -32,12 +32,7 @@
     CONF_USE_THREAD,
     CONFIG_SCHEMA,
 )
-from bellows.exception import (
-    ControllerError,
-    EzspError,
-    InvalidCommandError,
-    StackAlreadyRunning,
-)
+from bellows.exception import ControllerError, EzspError, StackAlreadyRunning
 import bellows.ezsp
 from bellows.ezsp.xncp import FirmwareFeatures
 import bellows.multicast
@@ -299,9 +294,9 @@ async def load_network_info(self, *, load_devices=False) -> None:
         can_burn_userdata_custom_eui64 = await ezsp.can_burn_userdata_custom_eui64()
         can_rewrite_custom_eui64 = await ezsp.can_rewrite_custom_eui64()
 
-        try:
-            flow_control = await self._ezsp.xncp_get_flow_control_type()
-        except InvalidCommandError:
+        if FirmwareFeatures.FLOW_CONTROL_TYPE in ezsp._xncp_features:
+            flow_control = await ezsp.xncp_get_flow_control_type()
+        else:
             flow_control = None
 
         self.state.network_info = zigpy.state.NetworkInfo(

tests/test_application.py

@@ -17,7 +17,7 @@
 from bellows.exception import ControllerError, EzspError
 import bellows.ezsp as ezsp
 from bellows.ezsp.v9.commands import GetTokenDataRsp
-from bellows.ezsp.xncp import FirmwareFeatures
+from bellows.ezsp.xncp import FirmwareFeatures, FlowControlType
 import bellows.types
 import bellows.types as t
 import bellows.types.struct
@@ -1874,7 +1874,7 @@ def zigpy_backup() -> zigpy.backups.NetworkBackup:
             metadata={
                 "ezsp": {
                     "stack_version": 8,
-                    "flow_control": None,
+                    "flow_control": "hardware",
                     "can_burn_userdata_custom_eui64": True,
                     "can_rewrite_custom_eui64": True,
                 }
@@ -1890,6 +1890,24 @@ async def test_load_network_info(
 ) -> None:
     await app.load_network_info(load_devices=True)
 
+    zigpy_backup.network_info.metadata["ezsp"]["flow_control"] = None
+
+    assert app.state.node_info == zigpy_backup.node_info
+    assert app.state.network_info == zigpy_backup.network_info
+
+
+async def test_load_network_info_xncp_flow_control(
+    app: ControllerApplication,
+    ieee: zigpy_t.EUI64,
+    zigpy_backup: zigpy.backups.NetworkBackup,
+) -> None:
+    app._ezsp._xncp_features |= FirmwareFeatures.FLOW_CONTROL_TYPE
+    app._ezsp.xncp_get_flow_control_type = AsyncMock(
+        return_value=FlowControlType.HARDWARE
+    )
+
+    await app.load_network_info(load_devices=True)
+
     assert app.state.node_info == zigpy_backup.node_info
     assert app.state.network_info == zigpy_backup.network_info
 

tests/test_xncp.py

@@ -171,20 +171,22 @@ async def test_xncp_get_flow_control_type(ezsp_f: EZSP) -> None:
             t.EmberStatus.SUCCESS,
             xncp.XncpCommand.from_payload(
                 xncp.GetFlowControlTypeRsp(
-                    flow_control_type=xncp.FlowControlType.Hardware
+                    flow_control_type=xncp.FlowControlType.HARDWARE
                 )
             ).serialize(),
         ]
     )
 
-    assert await ezsp_f.xncp_get_flow_control_type() == xncp.FlowControlType.Hardware
+    assert await ezsp_f.xncp_get_flow_control_type() == xncp.FlowControlType.HARDWARE
     assert customFrame.mock_calls == [
         call(xncp.XncpCommand.from_payload(xncp.GetFlowControlTypeReq()).serialize())
     ]
 
 
 async def test_xncp_get_xncp_features_fixes(ezsp_f: EZSP) -> None:
     """Test XNCP `get_xncp_features`, with fixes."""
+    ezsp_f._ezsp_version = 13
+
     ezsp_f._mock_commands["customFrame"] = customFrame = AsyncMock(
         return_value=[
             t.EmberStatus.SUCCESS,
@@ -220,6 +222,10 @@ async def test_xncp_get_xncp_features_fixes(ezsp_f: EZSP) -> None:
             | xncp.FirmwareFeatures.MEMBER_OF_ALL_GROUPS
         )
 
+    # XNCP is ignored for older EmberZNet
+    ezsp_f._ezsp_version = 8
+    assert (await ezsp_f.get_xncp_features()) == xncp.FirmwareFeatures.NONE
+
     assert customFrame.mock_calls == [
         call(xncp.XncpCommand.from_payload(xncp.GetSupportedFeaturesReq()).serialize()),
         call(xncp.XncpCommand.from_payload(xncp.GetSupportedFeaturesReq()).serialize()),