Quickest Way To Connect Sensor Is?

I am brand new to this LoRa thing, but not to wireless electronics. I want my first project to be the most basic sensor possible. I want to push a button and see it logged on my TTN console. Probably the best piece of kit I have to do this is a pycom LoPy. I will post to their forums as well, but what is the general project look like for a button to ping the gateway?

I suggest start here and read about this network and how LoRaWAN works before 'diving in.