Hi Matt,
when you talk about the current firmware, do you mean the Release 1?
I would recommend to update to Release 2 which supports Gateway functionality. It contains a lot of improvements and the firmware also complies to the FCC/ETSI regulation which is needed if you are developing a commercial product. Please refer to this post:
The position is indeed calculated on the Tag and its position is then sent to the Gateway (consisting from a Bridge node and a Raspberry PI). In the Release 2 both uplink and downlink data are supported. You can communicate easily with the nodes via MQTT Broker.
Cheers,
TDK