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Great!

I'd like to use as a serial-over-wifi adapter, for remote management of my SBCs.

Can anyone suggest a decent device for this, that relies on no soldering or 3d printing?

Ideally the device would expose a serial-over-USB port, so I can just plug in a USB-UART adapter.

The firmware can already be used as a serial over WiFi adapter through the Web CLI.

You do not need to connect a separate USB-UART adapter to it: simply connect the ESP32S3 UART pins directly to the board’s TX, RX, and GND pins.

Any ESP32S3 board could do it, see README for different types of supported devices

Ah, I see the M5 AtomS3 Lite has a grove, which is probably robust enough for me.

Great!