Is there an ability to use LCD on the J6 header, the gnss, and still use the J7 header uart (I assume RX0 and TX0 hoping I get revision D) for a user button? Just not sure if the uart is dedicated for something else on the sensor side of things etc. TIA
Serial1 (TXD1/RXD1) is on the sensor slot and usually used for the GNSS module.
Serial2 (TXD0/RXD0) is not used on a RAK19003, it is on other Base Boards with IO slot available.