Yes, i followed that think, found the library it is using to talk to the hub and it lead me to the link I posted above. How do you set up a new integration with the Harmony if the site linked in the instructions do not work anymore?
Fyi, here is the client it is using, in the readme it links to the protocol description:
Chuck,
I have not dug through how the âharmony-apiâ server works internally, but I can tell you that you can install it on a Raspberry Pi and have it discover your Harmony Hubs without ever providing any credentials to Logitechâs servers. My belief is that it somehow sends a LAN broadcast that the Harmony Hubs respond to. But that is just a guess! 
If I can find some time I may try to reverse engineer it so I can see exactly what it is doing.
Dan
So I have been watching this discussion and I do find it intriguing. We donât use Harmony Hub with ST or HE. It is tied into Alexa and we control everything through voice control. We do use the harmony remote for menu navigation, volume and to quickly switch between AppleTV, Xfinity and Xbox One.
I setup a virtual switch named Movie Time that is tied to Alexa and executes a RM turning off all lights and setting mood to blue.
I also use a Wemo Insight switch to watch for power from the TV which then controls both my RGBW lights behind the TV and also pauses the living room motion light rules.
I donât see a need for integration with what I have here as my entertainment comes from 3 different devices depending if I am renting a movie on appleTV, watching Kodi on XboxOne or watching HBO on Xfinity.
I use Alexa in a similar fashion. Where the integration comes in handy for me is in 2 scenarios.
I did find an interesting trick you use your Sonos/M3's to do with Alexa.
"Alexa turn off Movie Time"
RM runs all rules to do the automations
RM announces to room with an Alexa in it "Alexa turn TV off"
Just saying it does work. 
Great idea. Still prefer a direct integration because its lot less likely to fail though.
You do realize Harmony works directly with Hue, Lutron and other lights, right? When I start my movie activity my lights are all set how I want them, Nest is set to the temp that I want, etc. All without involving the Hubitat at all.
See that is the issue. Too many silo'd "I can do it all" solutions for home automation. I understand what others want for integration to automate the most with the least amount of multiple management systems. Harmony is really bad about doing this correctly 100% of the time as it has no way to get a response of confirmation. It is the same with Google, Alexa, Kasa, etc. Hence why IFTT came about because of all these isolated home automation solutions.
Anyways I love my Harmony for what it is good for and that is simple integration into Alexa for voice commands and managing multiple input sources while attempting to manage scenes/construct tasks (Turn XBOX on, Turn TV on, Turn Receiver on, Set all the correct inputs, and MAYBE do this action steps on the Xbox to bring up Kodi).
Also if you believe in optimal WAF (Wife Acceptance Factor) and wish to have more approval from the CFO to "invest" in more automation then the fewer home automation systems to control the house the better. Aka HE and Alexa only for us.
Yes, but most of my lighting is controlled via zwave plus dimmers. I have it working using @halfrican.ak thread, but would be so much nicer if integrated directly through a well done integration instead of a lutron plug in lamp module.
I have some cheap Ikea led lights on the back of my tv which are plugged into a zwave outlet. What I need is to be able to control that outlet, which I cannot do natively with Harmony.
Right, and the built in integrations that Harmony has do just that. No hack needed, you just need the right devices.
So you get an outlet you can do it with, like a lutron caseta.
Right, or the devices I already have and a hub with harmony integration. Like I already stated, I am using the lutron integration. I am more worried about the thousands of people with ST which has a harmony integration, when they consider switching to hubitat. I don't really want to tell them, yea it can be integrated if you buy an additional $90 lutron hub and a $45 plug in wall dimmer, or if all of your lighting is through hue.
But it can be integrated, just not officially (for now). My Harmony stuff works great with Hubitat.
I'm with @stephack, we need the Harmony integration because we have two hubs. In order to control the "other" hub, we are required to install a separate Harmony skill. Then to command that "other" hub, we have to say "Ask Harmony to". Logitech really messed up with support of more than one hub 
.
In addition, we have an Alexa routine "Good Morning". Right now Alexa routines cannot execute Alexa voice commands, so we can't put "Ask Harmony to turn on TV" into the "Good Morning" routine, have to say it separately. If Hubitat had Harmony integration, then I could have a virtual switch run the Harmony command in Hubitat.
But I can see how it's not Hubitat's job to make up for shortcomings with other devices .
For now I'm ok with not having official integration. The ported Logitech Connect app works great.....for now. My only concern is that the token I'm using (taken form my ST integration) stops working one day and then I have to explain to my wife why she needs to learn a new way to do this and that....or why this and that no longer works. I do that enough already.
I don't have the ST token...
.
My thoughts for now are:
Fascinating discussion. I have had a harmony for years and I still consider it one of the most important integrated devices in my smart home - second only to my Alexa units. The most important thing this does is set a virtual switch that tells me and other apps that the entertainment system is on or off. Like others I donât use the provided remotes ever in my house. Operation is either via Alexa, the Harmony App, ST App, or HousePanel. All trigger the Harmony activity and this the virtual switch.
So the obvious answer for me and I suspect many others considering a switch is to just keep their ST hub for the value of this integration, and then take steps to make it coexist with Hubitat. When activities start the ST integration sets the virtual switch and hub link can grab its state for Hubitat.
This solution avoids using hacked code and borrowed access tokens but does rely on ST staying alive. The bigger issue for Hubitat is providing a robust approach for all new users, rather than ST converts. For all new users I think a native integration of a non Logitech Harmony solution should be seriously pursued. It canât be that hard to make a good smart IR blaster box with an integrated zwave chip that gets the job done. Hmmm sounds like a good startup idea...
Mike mentioned this company has expressed interest in an integration with Hubitat. I would switch to Neeo in a second if there was a native integration for it.
Download the Hubitat app
