How can Home Assistant keep a stable KNX endpoint when an interface or gateway drops out?
A KNX/IP failover proxy for Home Assistant OS that checks multiple backend interfaces and handles failover and failback across TCP, UDP, and USB paths.
Network reliability / Work project · field-tested failover
Flappy.
A stable KNX/IP endpoint with automatic failover between interfaces.
PythonKNX/IPTCP / UDPHome Assistant OSDocker
FIELD-TESTED / HOME ASSISTANT OSOn-site systems.
BUILT FOR THE PLACE IT RUNS
On-site systems.
Not a hosted website.
Installed alongside Home Assistant OS and connected to the site’s KNX interfaces. The proxy cannot run as a public website; it needs the HAOS host and local bus hardware.
Deployed to 5+ sites · under 80 ms recovery in tested conditionsRésumé-reported deployment context
LIVE SYSTEM / CONCEPTUAL MAP HOSTED AT THE SITE
01HOME ASSISTANTSYSTEM EDGE
02STABLE PROXYSITE SERVICE
03KNX INTERFACESLOCAL ENDPOINT
HEALTH CHECK · FAILOVER · FAILBACK
HOME ASSISTANT OS HOSTOn-site compute · configured network · connected devices
SITE-BOUNDHome Assistant keeps one stable endpoint as the proxy selects a healthy bus path.
INTERACTIVE WALKTHROUGH / 01
Choose a control and see how the system’s ideas fit together.
flappy / interactive studyLOCAL PREVIEW
KNX/IP / STABLE ENDPOINT + BACKEND PATHS
HOME ASSISTANTStable KNX endpoint
PATH 01 / PRIMARYKNX interface AHealthy · active
PATH 02 / FALLBACKKNX interface BHealthy · standby
PRIMARY PATH ACTIVEMonitoring configured interfacesRésumé result: under 80 ms in tested conditions
Illustrative state transition · the click does not reach a KNX bus.
Make the system’s logic visible.
Keep a stable proxy endpoint in front of the KNX interfaces, monitor their health, switch to an available path, and restore the primary when it recovers.
A CLOSER LOOK / 04From the first input
From the first input
to a useful outcome.
This sequence summarizes the project’s core idea. The interactive panel is a local visual study; use the linked repository or live service for the implemented project.
01 →
Watch health
Check configured KNX interfaces while keeping one stable endpoint for Home Assistant.
02 →
Switch paths
When the active path fails, select an available backend interface and continue routing.
03 →
Recover primary
When the preferred interface returns, fail back while maintaining the stable endpoint.
KEEP EXPLORING / 05Read the source.