geeksville 8ccd59a7d8 Fix #115: wake from light sleep if a character arrives on the serial port ...

Note - we do this not by using the uart wake feature, but by the lower
power GPIO edge feature.  Recommend sending "Z" 0x5A - because that has
many edges.  Send the character 4 times to make sure the device is awake

2020-06-10 15:36:38 -07:00

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