The Blink up http://electricimp.com/docs/manufacturing/blinkup_faqs/
States the following:
“When blinking up an imp, a planId is generated. This planId can be used as a token that you can store to identify a user. If you store the planId, you can use it on future BlinkUps from the application (by setting the planId property).”
How can I set the planid property? Found no documentation