HomeLabber: I've been working with this for several years and it's been pretty solid. The notifications work well after you configure properly.

10 hours ago · profile

This might be a silly question, but can you run it offline? I'm setting up remote access and looking for options.

See also

• Stupid question: is MQTT the same as HTTP?
• Why is my sensor offline after updates?
• Issue: devices going offline in OpenHAB