So, my google-fu is lacking and i couldn't find the answers to two of my questions.
(1) What impact, if any, will I have if I install rule 5.0 to my main hub loaded with 100s of Rule 4.0/4.1 rules?
(2) Can i call 4.x rules from 5.0 rules? Similar to how rule 4.x rules can call one another.
Any ideas?
You can certainly have both Rule 5.1 and Legacy installed at the same time. I still have many Legacy RM rules. Yes, you can run Legacy rules from Rule 5.1:
Same here. I have older rules created when Rule 4 was new, they’re still working fine, and newer rules created with Rule 5.
Only a few dozen rules in total, not hundreds of them, but that shouldn’t matter.
Download the Hubitat app
