When using the EI Developer app, (on iOS10), the ‘clear device’ works just after startup of the app. The next time we try to clear a device (without restarting the app, nothing is send (no blinks). Killing and opening the app again makes it work again…
Yep, this is a known issue, see https://electricimp.com/docs/troubleshooting/knownissues/
We are very shortly going to be releasing an update which addresses it - it’s been in QA this week.