Hi,

this post describes how to check on a Raspberry Pi if a mobile phone (Apple or Android) is online and send EIB Telegram depending of the device is available or not to the EIB bus.

You need an running eibd to send packets via IP to the EIB/KNX Bus.
Continue reading EIBD/KNX/EIB: Check if a mobile phone is online and send EIB Telegrams depending on its state →