2019-05-20 17:49:43 +04:00
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# `uart-passthrough`
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Pass through UART from host to the ESP8285 WIFI chip.
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Any input from the host is forwarded to the ESP8285, and any input from the ESP8285
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2019-05-21 16:00:54 +04:00
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is forwarded to the host.
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Allows setting the baudrate through an out-of-band protocol. Pulling DTR low will
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reset the baudrate to the safe default of 115200, accepting two commands:
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```
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0x23 <baudrate 32-bit LE>
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Set baudrate (both to host and ESP)
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0x42
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Reset ESP8285 MCU (toggle WIFI_EN pin)
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others: no op
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```
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The connection from the K210 to the ESP can handle up to `115200*40=4608000` baud,
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however the connection to the host seems to get stuck at a lower number. Use
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`AT+UART_CUR=` (not `UART_DEF` !) to set the baudrate at the ESP side so that
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it is always possible to reset the MCU to get back to 115200 baud.
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