From 2cf46330b1ec3fde09599af5aaf51149e847af42 Mon Sep 17 00:00:00 2001
From: Matthias Alphart <farmio@alphart.net>
Date: Sat, 20 Feb 2021 20:08:59 +0100
Subject: [PATCH] Enable KNX routing optional local_ip (#46133)

---
 homeassistant/components/knx/__init__.py | 9 ++++++---
 homeassistant/components/knx/schema.py   | 2 +-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/homeassistant/components/knx/__init__.py b/homeassistant/components/knx/__init__.py
index 5a8b0d1c351..c957dbe5195 100644
--- a/homeassistant/components/knx/__init__.py
+++ b/homeassistant/components/knx/__init__.py
@@ -298,9 +298,12 @@ class KNXModule:
 
     def connection_config_routing(self):
         """Return the connection_config if routing is configured."""
-        local_ip = self.config[DOMAIN][CONF_KNX_ROUTING].get(
-            ConnectionSchema.CONF_KNX_LOCAL_IP
-        )
+        local_ip = None
+        # all configuration values are optional
+        if self.config[DOMAIN][CONF_KNX_ROUTING] is not None:
+            local_ip = self.config[DOMAIN][CONF_KNX_ROUTING].get(
+                ConnectionSchema.CONF_KNX_LOCAL_IP
+            )
         return ConnectionConfig(
             connection_type=ConnectionType.ROUTING, local_ip=local_ip
         )
diff --git a/homeassistant/components/knx/schema.py b/homeassistant/components/knx/schema.py
index 54134365b95..61909013739 100644
--- a/homeassistant/components/knx/schema.py
+++ b/homeassistant/components/knx/schema.py
@@ -38,7 +38,7 @@ class ConnectionSchema:
         }
     )
 
-    ROUTING_SCHEMA = vol.Schema({vol.Optional(CONF_KNX_LOCAL_IP): cv.string})
+    ROUTING_SCHEMA = vol.Maybe(vol.Schema({vol.Optional(CONF_KNX_LOCAL_IP): cv.string}))
 
 
 class CoverSchema: