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I would need the Watchdog timer of the Pi to kiss the halted Pi awake to make it boot again. I know about the Watchdog timer limitations, and that it should not be able to do it, but I have seen reports of users that complain about the "unfortunate" setup situation, where the pi performs a shutdown, and the WD (apparently) makes it reboot right away. That's what I want.

This post explains why...

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=29&t=44177&p=373587#p373587

Anybody?

  • Just wondering, why is this needed? The Raspberry Pi doesn't consume that much power on it's own to keep it running. – syb0rg Aug 15 '13 at 2:38
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    The linked post goes to a 'move root to usb' post. – Lawrence Aug 15 '13 at 3:42
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There is no way, without a separate circuit or device to have the RPi wake itself up. You could bridge the pins on P6 Header using an Arduino or similar, or a physical switch or jumper on those same pins, or cut power and re-energize the system, but you can't have the RPi power itself on.

  • WoL has no use on the PI as it does not support a power down mode. Ethtool will report that the network part of the pi is capable of WoL but it is not supported. – Kenneth Aug 15 '13 at 12:13
  • @Kenneth Answer modified. Thanks for pointing that out. – Butters Aug 15 '13 at 12:57
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The pi does not support -h since it is not capable of entering a powered down state. It is either on, as in running or it is not connected to a power supply. When you run shutdown -h it enters single user mode instead.

If you simply need a power cycle why not simply reboot:

sudo shutdown -r now
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Indeed, if you arm the watchdog on your Pi (with nowayout=1), then your Pi will reset (with the watchdog disabled) even if you shutdown -h now your Pi.

The only cases where you could be stuck are when the watchdog daemon is still working but something related to the network broke.

I have a Pi that I can't easily access, and I'm thinking of using the ping option of the /etc/watchdog.conf file, using a public ip from from some big company to reboot the Pi if it loose internet connectivity.

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