UPDATE (08.08.2016): Apparently you can get your api key at https://developer.lametric.com/user/devices now.
With the LaMetric Time Firmware update 1.6.0 the API for local push notifications changed and my tutorial for the 1.5.0 firmware does’t work anymore. The new firmware offers the possibility to show notifications without installing an extra app.
UPDATE: This doesn’t work with firmware 1.6.0 – see updated article here: LaMetric Firmware 1.6.0 and local push
With the latest firmware upgrade (1.50) the LaMetric finally got support for local push – allowing you to sent messages to the LaMetric without needing an internet connection. Because some people in the support forums asked how to use local push I decided to write a tutorial (I do this on OS X).