The story of an HCP-based tracking solution
Written by
Serban Petrescu

Some time ago I decided to build a (somewhat) complex showcase for a shipment management and tracking solution, targeted at the transport insurance domain. This was a nice spin off from an older UI5 application that I had built with some colleagues for a basic, related scenario.

In a nutshell, from a functional point of view, my new system would be able to:

·         Store all the “business” data related to a shipment (e.g. route, schedule, insurance conditions, etc.).

·         Record the position and environmental parameters of a shipment.

·         Expose this data, enabling real-time tracking.

·         Send notifications via email to all specified people when certain conditions were broken during a transport.

·         Perform simple analytic scenarios by using all the collected data (e.g. comparing the evolution of several shipments, viewing various statistics, etc.).

It was clear from that start that I would need to make some GPS and internet-enabled tracking devices with sensors attached, which would periodically report the current position and sensor values. I would also need a cloud-based application to collect, process and expose all this data.

Seeing the whole lot of fuss around the HANA Cloud Platform at the time (about a year ago), I’ve decided to try it out and see how and if it would work out. Luckily enough, I had access to a paid HCP account and even got to play around (most of the time) with whatever I wanted on it.

Thus, I ended up designing the following solution:

I’ve built the whole persistent data model by using HANA CDS and exposed most of it through OData (via XSODATA). Later, I even included geospatial columns to the CDS entities for storing the route paths and sensor reading locations. Here I bumped in the first major problem: I had to change the coordinate system for a CDS entity column. Too bad you cannot really do this by using SAP tooling, so in the end I had to use some ugly (but working) workarounds to modify the tables.

Because at the time I started, the trial HCP had a pretty unstable HANA offering (no MDCs) and the paid account did not yet include the IoT service, I decided to build my own device configuration component which I named the “Administration” component. It was responsible for allowing the user to define new routes, schedules, sensors, devices, transports and people. Basically it had some simple XSJS (classic) services for actions that were not covered by the OData services and some nice UI5 + Google Maps UIs.

The “Tracking” component was pretty simple, it had only one XSJS endpoint which could be used by any internet-enabled device to report the position and sensor values in JSON format. I would have liked to enable plain HTTP (with no S at the end) for this endpoint to allow a wider range of devices to use it. But I learnt that you cannot do this for a HANA instance in the cloud, even though there is a special setting for this, which apparently doesn’t work.

This component also had a UI which directly used the OData service to show the current shipment positions on a map (I actually made some simple wrapper UI5 controls for the Google Map and Markers).

The last HANA component was the “Analytic” one. I built several XSJS services and SQLScript procedures for:

·         Showing the evolution in time / geographically of a shipment.

·         Comparing shipments.

·         Dynamically creating statistics.

·         Wrapping some PAL functions for forecasting the future evolution of the statistics.

To display all these analytic scenarios, I used of course the very nice charting library that UI5 has built-in.

All the user interfaces that I made “in the cloud”, I then deployed as separate HTML applications on the HCP account and registered them on the Fiori Launchpad. Sometimes the Launchpad would have some strange issues with loading UI5 libraries or controls, but I circumvented them by forcing the UI5 apps to load everything from the start.

Cluj-Napoca
Grand Hotel Italia
October 20,21
20, Conference Day
21, SAP CodeJam