Machines are talkative these days. Whether we collect their signals over OPC UA, subscribe to an MQTT topic, or let a PLC write into a database table, the result usually looks the same: a long list of events, each with a timestamp, the machine it came from, and a few...
OpenWeatherMap offers a simple, easy-to-use API that provides weather data for anywhere on Earth. This API runs in the backend of many websites and applications. And here’s the best part: Some of the API endpoints are free to use, so long as you don’t exceed a certain quota. In this...
Things often don’t turn out as we expect them to, and they end up breaking unexpectedly—this is true for everyday life, as well as for software. We won’t deal with real life problems in this article, but we will tackle exceptions in code. When code breaks, we say that an...
As readers of this blog know, we have a lot of articles about SAP. The last one was SAP on fire - how to perfectly integrate LUA scripting with SAP. But there was something missing in that article, which we will discuss now. In this article, we will learn how...
Because SAP is one of the top 3 systems used with Peakboard, there are already a lot of SAP articles available on this blog. But those articles cover how to access SAP for reading and writing from a data source. In this article, we will learn how to make sophisticated...
JSON is the most popular data format for modern web and cloud environments. Peakboard applications often use JSON. For example, when calling an API and processing the response. A good way to extract the desired data from a JSON string is to use a JPath expression, rather than using basic...