I have been working with KiwiSDR antenna switch extension. You can now choose different backends. Currently available backends are MS-S7-WEB controller and Beaglebone GPIO's. You can also write your own backend for controlling your own antenna switch box. If you are already running older version of KiwiSDR antenna switch extension, please uninstall it before installing a new version.
New version is available now on Github: https://github.com/OH1KK/KiwiSDR-antenna-switch-extension