A presentation on how to setup a powerful industrial IoT solution for a typical energy monitoring use-case, built on open source technologies* and elaborate on various architecture approaches and challenges. (*Eclipse Kura/Kapua/Hawkbit, Thingsboard.io, AgileIoT, Resin.io, NodeRED, OpenHAB, RPi, ESP8266/32, Modbus, MQTT), by Manolis Nikiforakis of Ex Machina