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→System overview
The legacy machine is powered by an embedded system that was designed by DAVE Embedded Systems years ago and that consists of several boards. Two of them are more relevant for the purposes of this discussion. They are named "Single Board Computer" and "I/O board" as shown in the following picture. [[File:DAVE-IIoT-legacy-machine-hw-sw-block-diagram-sniffer.png|thumb|center|600px|Hardware/software architecture of the legacy machine]]
The former is built upon SBCX. It runs Android 6 (Marshmellow) and implements the high-level business logic besides the capacitive touch-screen based Man-Machine Interface (MMI). The latter integrates a bunch of I/O interfaces. The two boards are connected with an RS485 link on which data are exchanged through a proprietary protocol.