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SAMD51 sleep tradeoffs #170

@neilh10

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@neilh10

When WioT/SAMD51 powers down, it also powers down USB device.
Problem how to detect USB device is in use when powers up.
Right now sleep is simulated through a loop to keep the USB as debug port valid
It might me that USB device is only used on power up, and that debug is through a UART.
---Boot() Sw Build: a\src\samd_log_display_to_MMW.cpp May 3 2024 15:15:38 b'neilh20'
b'rel1_dvlp1m'
Sw Name: WioTerm 5*Temperature Monitor to MMWinternal WiFi
***** Low Power RTC SAMD51 48000000MHz *****
Using ModularSensors Library version 0.34.1-bab

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