I’m currently developing an application around the Electron. In this application, I would like the Electron to send 2 unique data values to a webserver every 15 minutes. I was wondering if there were any plans to allow the Electron to be woken up via a message over 3G? This would allow for a very tightly controlled logging system and would be more than ideal for my application.
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there is a schematic here that leads to the pin PB12:
If the uboot device is still powered you could issue an interrupt that wakes your device up! 
But I'm not familiar if the PB12 is interrupt able and if you can still power the ublox while you are in sleep.. this is probably the device using the most current
this is probably everything you need… 