I have been working over the past several days trying to get the Core interface with the Arduino Uno (using Serial). When ever I start up my Core, it flashes Green like normal (connecting to the internet) then it begins to breath Cyan for several seconds then it goes to Breathing Green. I have researched into it, and I can’t seem to find if out what that means. Any help would be greatly appreciated!
Mostly due to blocking code.
Other people seeing this had already posted in the past 
https://community.particle.io/search?q=breathing%20green
2 Likes
had a Core which was working in the field successfully for over a year. It’s suddenly started breathing green. I suspect some sort of keys issue.
It’s showing as having a recent handshake on the dashboard
hmmm
! This device is not claimed to your Particle account.
! Resetting keys for a device you do not own may permanently prevent it from connecting to the Particle cloud.
? Skip resetting keys? No
Put the device in DFU mode
Tap RESET/RST while holding MODE/SETUP until the device blinks yellow.
? Select Continue when ready Continue
Okay! New keys in place, your device will not restart.
***************************************************************
Warning! - device id was shorter than 24 characters - did you use something other than an id?
use particle identify to find your device id
***************************************************************
New Key Created!
Saved!
Saved!
attempting to add a new public key for device 6dxxxxx748xx
The Doctor didn't complete successfully. Make sure your device is in DFU mode (blinking yellow), and that your computer is online.: Error sending public key to server: Permission Denied
> Please visit our community forums for help with this error:
https://community.particle.io/
It ALWAYS says ! “This device is not claimed to your Particle account.” whether the device is or isn’t claimed (as in, there’s a bug) so that doesn’t worry me but I don’t think I’ve ever had this problem before