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# 5 Introduction to OGC SensorThings API
The SensorThings API (STA) is a standard of the Open Geospatial Consortium (OGC) [\\[1\\]](#_ref_1). It provides a framework for communication and exchanging data between sensors and applications. The standard is devided in two parts. SensorThings API Part 1 is dedicated to sensing and was published in 2016 and updated in 2021.
The SensorThings API (STA) is a standard of the Open Geospatial Consortium (OGC) [\[1\]](#_ref_1). It provides a framework for communication and exchanging data between sensors and applications. The standard is devided in two parts. SensorThings API Part 1 is dedicated to sensing and was published in 2016 and updated in 2021.
A STA-based architecture works in client/server mode. A sensor device pushes data to the SensorThings Server via HTTP. A SensorThings Server may also support MQTT protocol to support publish and subscribe capabilities. An interested application can subscribe to the MQTT-Broker, in order to get notified about new sensor events.
