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README: doc usb

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Astro 2020-10-10 20:50:57 +02:00
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@ -77,3 +77,14 @@ The scope of this setting is per TCP session.
| `save` | Save configuration to EEPROM |
| `reset` | Reset the device |
| `ipv4 <X.X.X.X>` | Configure IPv4 address |
## USB
The firmware includes experimental support for acting as a USB-Serial
peripheral. Debug logging will be sent there by default (unless build
with logging via semihosting.)
**Caveat:** This logging does not flush its output. Doing so would
hang indefinitely if the output is not read by the USB host. Therefore
output will be truncated once buffers are full.