We designed a prototype with WLE5 without TCXO. The RF part not tuned at all and we got only 20m distance inside the building with 4db output, but I look forward for a better results. We also consider to change SUBGHZ_HSEOUTTRIMR values dynamically b...
I would suggest you to start with two STM32WL55JCI Nucleo boards to evaluate if you need M0 + M4 cores. You may decide that you need only M4 core and that may help you with the choice of the future module or CPU.
Load the latest CubeMX. On the first screen select 'Access to example selector' and find SubGhz_Phy_PingPong example. You can use LORA or FSK for tests.
