BTB dat

• ESP32-SPI-dat

ESP32 Pin	Function	Lora
IO14	SPI_SCK
IO12	SPI_MISO
IO13	SPI_MOSI
IO15	SPI_CS
IO4	IO	LORA_IRQ
IO27	IO	LORA_RESET

base board

attach board

lora

• lora-dat - ESP32-SPI-dat

• use UART as main interface

SIM7020

• use UART as main interface