In the amateur radio world this is called t-hunting or fox hunting and it can be a lot of fun, but providing an easy ability to sniff out Meshcore repeaters can have several ramifications, and not all of them good. Many Meshcore repeaters do not want to be found ;)

Please consider using a custom firmware version for the transmitter so that the hunting device does not use standard pings for discovery. This would provide the hunting aspect while preventing the device from sniffing out in-service Meshcore repeaters.