fix(config_flow): per-host zeroconf updates — blank auto-detect hosts self-heal from the discovery address, a deliberately-different ADB host is never clobbered, same-IP with both hosts current is a no-op (F2)

tests/test_standalone_setup.py

@@ -436,6 +436,34 @@ class TestZeroconfDiscovery:
         hass = FakeHass(str(tmp_path))
         flow.hass = hass
 
+        # both hosts already hold the discovered address: nothing changes
+        entry = SimpleNamespace(
+            unique_id="aa:bb:cc:dd:ee:ff",
+            options={
+                CONF_PROTOCOL_ENABLED: True,
+                CONF_PROTOCOL_HOST: "192.168.1.50",
+                "adb_host": "192.168.1.50",
+            },
+            entry_id="e1",
+            title="Shield",
+        )
+        sys.modules[__name__]._zc_holder.entries[:] = [entry]
+
+        result = await flow.async_step_zeroconf(
+            self._discovery(props={"mac": "aa:bb:cc:dd:ee:ff"})
+        )
+
+        assert result == {"type": "abort", "reason": "already_configured"}
+        assert hass.config_entries.updating_entry_calls == []  # no IP change
+        assert hass.config_entries.reloaded_entry_ids == []
+
+    async def test_blank_adb_host_self_heals_from_the_discovery_address(self, tmp_path):
+        """F2: a blank (auto-detect) adb host follows a same-IP rediscovery."""
+        module = _form_module()
+        flow = module.NvidiaShieldConfigFlow()
+        hass = FakeHass(str(tmp_path))
+        flow.hass = hass
+
         entry = SimpleNamespace(
             unique_id="aa:bb:cc:dd:ee:ff",
             options={CONF_PROTOCOL_ENABLED: True, CONF_PROTOCOL_HOST: "192.168.1.50"},
@@ -449,8 +477,40 @@ class TestZeroconfDiscovery:
         )
 
         assert result == {"type": "abort", "reason": "already_configured"}
-        assert hass.config_entries.updating_entry_calls == []  # no IP change
-        assert hass.config_entries.reloaded_entry_ids == []
+        # only the adb host was filled (self-heal), protocol already current:
+        update = hass.config_entries.updating_entry_calls[0][1]["options"]
+        assert update["adb_host"] == "192.168.1.50"
+        assert update["protocol_host"] == "192.168.1.50"
+        assert hass.config_entries.reloaded_entry_ids == ["e1"]
+
+    async def test_deliberately_different_adb_host_is_never_clobbered(self, tmp_path):
+        """F2: an explicit ADB override survives a protocol-host IP change."""
+        module = _form_module()
+        flow = module.NvidiaShieldConfigFlow()
+        hass = FakeHass(str(tmp_path))
+        flow.hass = hass
+
+        entry = SimpleNamespace(
+            unique_id="aa:bb:cc:dd:ee:ff",
+            options={
+                CONF_PROTOCOL_ENABLED: True,
+                CONF_PROTOCOL_HOST: "10.0.0.1",  # stale (IP moved)
+                "adb_host": "10.0.0.9",  # deliberate ADB override
+            },
+            entry_id="e1",
+            title="Shield",
+        )
+        sys.modules[__name__]._zc_holder.entries[:] = [entry]
+
+        result = await flow.async_step_zeroconf(
+            self._discovery(props={"mac": "aa:bb:cc:dd:ee:ff"})
+        )
+
+        assert result == {"type": "abort", "reason": "already_configured"}
+        update = hass.config_entries.updating_entry_calls[0][1]["options"]
+        assert update["protocol_host"] == "192.168.1.50"  # protocol followed
+        assert update["adb_host"] == "10.0.0.9"  # override untouched
+        assert hass.config_entries.reloaded_entry_ids == ["e1"]
 
 
 class TestAppsMapOptionsEditor: