I’m testing the TTGO_LORA32 board (sch here: https://raw.githubusercontent.com/LilyGO/TTGO-LORA32/master/schematic1in6.pdf) with NuttX RTOS and noticed the `sx127x` app is not working with default LoRa Modulation, but at least I got it working with FSK modulation:

$ ./tools/configure.sh ttgo_lora_esp32:sx127x

$ make -j flash ESPTOOL_PORT=/dev/ttyUSB0

Board 1:

NuttShell (NSH) NuttX-10.4.0                                                    
nsh> sx127x -m 1 -t                                                             
Start sx127x_demo                                                               
FSK modulation                                                                  
Set frequency to 868000000                                                      
Set power to 14

Board 2:

nsh> sx127x -m 1
Start sx127x_demo
FSK modulation
Set frequency to 868000000
Set power to 14
Waiting for data

Received:
SNR  = 0
RSSI = -66
len  = 5
0x00 0x01 0x02 0x03 0x04 

wait 5 sec ...