Can't write to a custom Characteristic through EspruinoHub (stuck at "Getting Service")

Hi,

Is there some interplay between setAdvertising and setServices?

Occasionally - when you specify a second argument to setServices for the services you want to advertise (but you're not doing that here so I don't think it's an issue).

Am I using the wrong format for specifying service/characteristic ID?

That all looks good to me.

I'd maybe try using a newer firmware on Puck.js just in case?

I just tried your code here and while /ble/write/puck/0000aaaa0000100080000080­5f9b34fb/0000aaa000001000800000805f9b34f­b doesn't work, /ble/write/puck/aaaa/aaa0 does seem to work great for me.