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→System overview
With regard to the gateway, on the legacy machine side, it acts as a traffic sniffer. It is connected to the RS485 link and "eavesdrops" all the traffic flowing through this channel. As it is aware of the protocol used, it can parse the exchange packets and extract data from them. On the cloud side, the gateway uploads to the NoSQL database every extracted piece of data along with an associated timestamp.
It is worth remembering that the '''extraction of data to be uploaded to the cloud is a non-intrusive process''': to implement this solution, '''no hardware/software modifications of the legacy machine were required for the implementation of this solution'''.
== Cloud architecture and services ==