I am probably missing something but in the this day and age why would anyone want to install either a Crestron or Control4 system. You can do almost everything they do with either Google Home or Alexa at a fraction of the price. The level of automation and the rate of innovation of those two ecosystems will leave those old home automation systems in the dust.
Unless you have cash to burn (and some people do) and want to pay someone to install a fancy wall mount control screen you can do a lot better.
A,
Thanks... It's not that I'm sold on C4 (yep, I know it's expensive and I certainly don't have money to burn or do I want to

). But, as of yet, I have not discovered a reasonable UI solution to interface with my IntelliCenter. I don't think that Google Home or certainly Alexa will do want I want, but I will take a look for sure.
Trust me, I have followed with great interest (and amazement) what you,
@cmc0619 and others have done with the home brew systems. Impressive but this is a road that I don't really want to go down nor do I possess the skill sets to do so.
I have an outstanding base automation system that provides everything that I want to do with it (except for the current inability to add the actuators to the 485 bus of course). What I don't have (and desire), is a modern, functional and half way decent mobile/desktop remote user interface.
In fact, the UI's that I am currently hand-cuffed to -
SUCK. They are no better than something out of the 90's. I would be happy to provide you with a comprehensive list of deficiencies that currently exist with the these IntelliCenter UI's. How much time do you have? lol.... And a couple of the UI's are down and don't even work anymore (Alexa and Apple Watch app). All, that I am looking for is a way to simply talk to my panel (preferably over IP) without discovering that one thing after another does not work when it comes to the IntelliCenter UI's.
I don't want to get into RP's, arduino, etc (although that may be the only reasonable solution when all is said and done). My problem is that although I'm probably smarter than the average bear when it comes to IT, I am NOT, nearly as smart as you and the other home brew folks when it comes to writing code etc.
I'm following (in awe), all of the attempts and projects on Github and other sites as well to interface with IntelliCenter, but I don't posses the talent to do what they are doing. The other problem is there is not one step-by-step instruction on how to do all of this, because if there was, then darn, I'm pretty good at following instructions. If someone could bundle up the interface and code/UI's and provide them to someone like me, I'd be the first in line to purchase.
The one thing that impresses me with Control4 is once you get the hardware (and a simple program written by a dealer), you can hire an off-site programmer to write the LUA code to make the system operate the way you want, if I understand some of this correctly.
In summary, my end-state is to "find a reasonable solution that will provide a functional and comprehensive user-friendly IntelliCenter user interface for my desktop, iOS devices and use an Alexa Skill that will actually function, and so that I am no longer dependent on the Pentair web-servers/API and all of the associated problems and frustrations that it brings" Not too much to ask for right?

Your thoughts are always of interest.
Thanks again and stay safe,
r.