Alarm system with cellular backup

[bkprath (Brian)]

I just posted one approach for handling cellular backup

How to: HA base security system with Cellular backup and 24/7 3rd party monitoring

The primary purpose of this post is to provide one approach to providing Cellular backup communications to Home Assistant. While my focus was for the purpose of an alarm system it’s also appropriate for general HA access. I’ll need to review this again to make sure I didn’t leave anything out. One side benefit to the approach provided here is you end up with a cell phone that can be used as a wall mount replacement for a security system keypad. This phone can also replaces a dedicated home l…