Okay, I think I understand the architecture now.
I’d assumed that as the Seeed board contains an ESP32 and an Ethernet interface users would be running their own code on the ESP32, but I see now that it’s listed under the list of connectivity modules.
Presumably the downloadable image is flashed to the ESP32 and when you then boot it you’ll see some info about how to connect a separate MCU and the baud rate etc to use.
If you’re programming your RA4M1 in C++ then this post…
and the ones that follow it may help?
Pete.