How to communicate with Base Station in the GNSS-GTK Kit (SKU: KIT0198-EU)?

Hello,

 

I want to use the GNSS-RTK High-Precision Positioning Kit (SKU: KIT0198-EU) in a robotics project and would like to know whether it’s possible to send additional custom data from the Base Station to the Mobile unit over LoRa, alongside the RTK correction data.

 

My setup idea:

- Base Station: connected to a Raspberry Pi or ESP32 that monitors weather or system status.- Mobile Unit: attached to a robotic lawnmower, with an ESP32 receiving RTK corrections and other data via UART or I²C (using the Gravity connector). 

The goal is for the Base Station to transmit both RTCM correction data and small command packets (for example, “return to home” when power is lost or during rain).

 

My questions are:

1. Does the Base Station’s LoRa module allow transmission of user-defined data in addition to RTCM messages?

2. If so, which interface (UART/I²C) and protocol should be used to inject custom messages from the Base Station’s MCU or host (ESP32/RPi)?

3. Are the LoRa radios accessible separately, or is their firmware fixed to forward only RTCM data?

 

Thanks in advance for your help! I’d like to understand whether I can extend the Base–Mobile communication link to include control signals in addition to RTK data.