I'm starting to think that there is no way to know that Linino has booted successfully from in a sketch.
I appreciate the suggestion about rebooting the MCU from Linino, but that's a work around.
The issue is that my sketch trys to open a URL right away. If it does this while Linino is booting, it appears to cause instability on one side or the other. Given that when power is applied, the MCU boots quickly and messes up Linino, having Linino reboot the MCU wont work.
So, I'd love to hear if there is a way to open the console and listen for the expected string at the end of the boot messages.
-Kyle