I have integrated my Ring Doorbell by using it to trigger an Alexa Routine (using the Ring skill for Alexa). This routine then 'turns on' a Hubitat virtual switch/motion device (using the Hubitat skill for Alexa) and a virtual switch/motion driver that I wrote. This driver, when turned "on" by the Alexa routine, will also cause a Motion Event on Hubitat. The virtual switch/motion device then automatically deactivates so it is ready for the next Ring Motion event. This integration has been extremely reliable and fast.
As for the Logitech Harmony Hubs, you're also in luck. You can use my Logitech Harmony Hub Driver to integrate these with Hubitat. Each Harmony Activity will appear as a Hubitat Switch device. This integration is 100% local on your LAN - no cloud integration required.
