Abort myq homekit config when one is already setup.

We can see myq on the network to tell them to configure
it, but since the device will not give up the account it is
bound to and there can be multiple myq gateways on a single
account, we avoid showing the device as discovered once
they already have one configured as they can always
add a new one via "+"

homeassistant/components/myq/config_flow.py

@@ -67,6 +67,14 @@ async def async_step_user(self, user_input=None):
 
     async def async_step_homekit(self, homekit_info):
         """Handle HomeKit discovery."""
+        if self._async_current_entries():
+            # We can see myq on the network to tell them to configure
+            # it, but since the device will not give up the account it is
+            # bound to and there can be multiple myq gateways on a single
+            # account, we avoid showing the device as discovered once
+            # they already have one configured as they can always
+            # add a new one via "+"
+            return self.async_abort(reason="already_configured")
         return await self.async_step_user()
 
     async def async_step_import(self, user_input):

homeassistant/components/myq/strings.json

@@ -19,4 +19,4 @@
       "already_configured": "MyQ is already configured"
     }
   }
-}
+}

tests/components/myq/test_config_flow.py

@@ -4,6 +4,9 @@
 
 from homeassistant import config_entries, setup
 from homeassistant.components.myq.const import DOMAIN
+from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
+
+from tests.common import MockConfigEntry
 
 
 async def test_form_user(hass):
@@ -101,3 +104,24 @@ async def test_form_cannot_connect(hass):
 
     assert result2["type"] == "form"
     assert result2["errors"] == {"base": "cannot_connect"}
+
+
+async def test_form_homekit(hass):
+    """Test that we abort from homekit if myq is already setup."""
+    await setup.async_setup_component(hass, "persistent_notification", {})
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": "homekit"}
+    )
+    assert result["type"] == "form"
+    assert result["errors"] == {}
+
+    entry = MockConfigEntry(
+        domain=DOMAIN, data={CONF_USERNAME: "mock", CONF_PASSWORD: "mock"}
+    )
+    entry.add_to_hass(hass)
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": "homekit"}
+    )
+    assert result["type"] == "abort"