SSD1306 driver is Arduino style C/C++ library with unicode support. The library can be compiled for plain Linux (for example, raspberry spi), or you can use it with plain avr-gcc compiler without ...
Setting it up is really easy.
The LilyGo TWatch Ultra can be purchased from LilyGo here. The US version uses the 915mhz model. LoRa radio — powers the SX1262 on/off and shows live stats: node ID, frequency, bandwidth, RSSI, ...