locationengine
This Go library helps you to connect to Kontakt.io's MQTT broker and receive realtime location data of items near your Kontakt.io receiers.
After parsing the location data, the library triggers your callback functions, notifying your application of new items appearing, items disappearing, as well as changes in RSSI and proximity status.
Usage of the library is demonstrated in the simple printevents app. You will need a Kontakt.io API key as well as the UUID of your place or receiver in order to try this app out.
More information on the API used can be found on the Kontakt.io Location Engine Monitoring page