LK IHC integration with OpenHAB3
December 07, 2021 —
Jakob Dalsgaard
If you have a fairly old LK IHC controller in your house, then it is not able to use any of the TLS ciphers a recent Java may use. For security reasons these old ciphers have been disbled and thus OpenHAB 3 cannot talk to your controller. Usually, however, some old ciphers can be allowed by changing your configuration. On my Debian with Open JDK 11 this is done by editing /etc/java-11-openjdk/security/java.security -- find the line starting with jdk.tls.disabledAlgorithms= and remove TLSv1 from the list. Then restart openhab service by doing sudo systemctl restart openhab.service -- and voilà your OpenHAB 3 should be able to connect to your old LK IHC controller.