Why didn’t I receive Open time alerts when I was away?

The system checks your roster before sending Open time SMS's.

The Open time subsystem will not send you messages while you are on duty or AL or LSL.

Since some people do want to do trip swapping/etc soon as they are home, it will send messages on the last day of your duty or AL/LSL.

You can request alerts whilst on AL/LSL on the settings page at Settings - Opentime