Hooked up a N8R8 and ESP-DF with a SD sniffer to tap into my CPAP data found out, almost all machines use 1-bit protocol at around 12mhz tho there are more modern ones that ride on 4-bits. Anyways thanks to the esp32 I was able to successfully detect the write commands from the CPAP and send the blocls to my own system in real time, then reconstruct the files and parse them for the signal waveform, respiratory events and other good calculated metrics the machine just writes directly into the SD card. and for hiccups in the communication used the 8mb of the PSRAM as cache from DMA, to hold on on those sectors while WIFI is off or the service is down, then drain the data in a FIFO. Damn proud of this little project