Mark S. said:
I'm not sure there is one, and sadly I fear that the era of consumer-managed alarm and home automation is waning, so there may never be one. I am concerned that even ELK may take a more proprietary direction. The more common approach seems to be the income-producing cloud-based ADT and Ring subscription-type systems.
One of the things that got me into automating home security, lighting, etc. was the fact that I could play with electronics and programming on a casual basis and customize Stargate/Caddx//ELK/Homeseer/etc. to do exactly what I want. It was a fun and rewarding hobby. But it seems like things are evolving to the point that you have to either 1) use the canned ADT/Ring systems with the "you'll get what we give you and you'll like it" attitude, which takes the fun out of it, or 2) become much more deeply involved in specialized stuff like MQTT, Tasker, JSON, and coding to roll-your-own, at which point it ceases to be a hobby at some point.
Sorry for getting a little off-point there, but I fear that ELK (and other OEMs) will no longer support limited-acceptance technologies like UPB or X-10 anymore, simply because they have to pursue the market. I do hope that ELK comes through, but if there is another DIY-friendly OEM out there, I'm in.