Knonx connects to your KNX installation and sends "on" or "off" to a configured groupaddress. If no interface is found or if the configuration is empty, the settings menu is open where you can configure the groupaddress or the ip-address of the interface, if you have more than one ip-interfaces in your network.
Prerequirement is an ip-interface which works in tunnel mode.
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Send command with your smartwatch!