Confusing definition of GPS_RX and GPS_TX

[jayAitch256]

I'm trying to adapt this sketch for a custom ESP32 based board with an external GPS and a different pinmap. After a while I realized that GPS_RX and GPS_TX (gps.h) are defined in a pretty unusual way here.

The pin GPS_RX means the TX pin of the ESP here (wired to RX of the GPS). GPS_TX is the RX pin of the ESP (wired to TX of the GPS).

I understand that this won't really matter if you just use the T-Beam, but for others who are planning to reuse the code for other boards, this notice might be helpful since it is not the "normal" way most people would handle the terms RX and TX.