How do I create device interaction on a geo grid? Craig Conover February 16, 2021 07:49 Updated Geohashing Chat by User Proximity Tutorial is the best place to start to learn more about Geo Grid Device Interactivity. Related articles How do I check PubNub network connectivity? How do I handle publish timeouts? Can I use PubNub to track moving objects? How do I track presence of unique clients? What is channel presence?