Industrial IoT (IIoT)—sometime referred to as Industrial Internet—is one of the key elements of the Industry 4.0 model.

Nowadays, the implementation of need to implement IIoT solutions, associated with machines that are already in operation, are is pretty common. This step is usually part of a broader plan that is a migration path toward the Industry 4.0 model. Traditional industrial machines and systems, which were conceived and deployed before the introduction of Industry 4.0 concept, often have no Internet network connectivity. As such, it is usually challenging to find '''non-intrusive retrofitting solutions to connect them to the Internet'''.

This Technical Note describes a real-world example in which the versatility of [[:Category:SBC_Lynx|SBC Lynx ]] was leveraged to address this issue. A customized industrial gateway was built on the base of [[XUELK-AN-005:_Implementing_an_Industrial_IoT_gateway/supervisor|SBC Lynxthis implementation]]. This device, which is able to perform '''non-intrusive data collecting from a legacy industrial machine''', is part of a '''larger data collecting and monitoring system''' that will be illustrated in the following sections as well.

===The legacy industrial machine===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.

The former ''Single Board Computer'' is built upon [[:Category:SBC-AXEL|SBC-AXEL]] off-the-shelf board. It runs Android 6 (Marshmallow) and implements the high-level business logic besides the capacitive touch-screen based Man-Machine Interface (MMI). It is a blatant example of DAVE Embedded Systems' capability to change and adapt Android to embedded platforms devoted to industrial applications. The latter ''I/O board'' integrates a bunch of application-specific I/O interfacesports required to interface the electromechanical parts of the machinery.  The two boards are connected with an RS485 link on which data are exchanged through a proprietary protocol. ===The industrial gateway===The gateway is powered by an embedded Linux distribution, which was tailored for such applications. On the legacy machine side, the gateway 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 exchanged packets and extract data from them. On the cloud side, the gateway uploads every extracted piece of data to the NoSQL database, along with an associated timestamp.

The services can be accessed from anything able to run a browser (PC, Mac, Android mobile devices, etc.). For instance, this picture refers the following pictures refer to a screenshot couple of screenshots captured on an Android smartphone showing : the first shows a status list of the monitored devices, while the second shows the status of one specific machine.

[[File:DAVE-IIoT-app-device-list.png|thumb|center|600px150px|Android app showing monitored devices list]]  [[File:DAVE-IIoT-app-device-status.png|thumb|center|150px|Android app showing the status of one specific machine]]

This visualization is used to monitor how a device is operating in real-time by providing a live view of specific variables changing over time. The following screenshot shows, for example, a portion of such a data stream, visualized in real-time. The screenshot refers referred to a browser running on temperature measured by a PC platformsensor embedded in the legacy machine.