Running openHAB 2.1, FHEM, Mosquitto, MySQL, Nagios on a RaspPi 2.
Testing openHAB 2.4 as parallel installation for migrate from OH 2.1
Running Zigbee, ZWave, NGinx, PiHole on a RaspPi 3

Clients: RWE SmartHome (OH), Rademacher DuoFern (FHEM), Abfallkalender (FHEM), Telegram (FHEM), Weather (OH), Persistence (OH), many Sonoffs (Tasmota), many Shellys (Tasmota), Alexa. OH exchange data from/to FHEM via MQTT. Logic and control on OH