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linux: Add note about esptun baudrates

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Wladimir J. van der Laan 2020-02-22 15:01:08 +00:00
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linux/README.md
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@ -27,6 +27,18 @@ For example:
(setting the MTU to `1500-20-8` the typical network MTU minus IP and UDP header overhead, because
otherwise the ESP's network stack will drop the oversized packets)
### Baudrate note
If the tunnel hangs intermittently, the problem may be the `BAUDRATE` setting. The ESP8285 can handle
baudrates up to `115200*40 = 4608000` baud and `esptun` will try switching to a higher baudrate.
However, these higher baudrates are unstable as it seems that the UART cannot
keep up reading in some cases and loses data. This may be a misconfiguration or something that could
be improved in the `8250_dw` Linux driver for this peripheral (DMA support?).
Which values work may vary, if you want to be completely safe use `115200`. The value can be changed
at the top of `esptun.c`.
Host side
---------