You know, I can't say I tried using the ST integration without the ST hub up and running. Maybe someone could try it to confirm?
ah
If I can find the time today, I'll give it a go and let you know.
If you try this, using the Hubitat official ST to Hubitat integration, you will need the ST hub up and running on the network. The Hubitat SmartApp, "Send Hub Events", uses HubAction to transfer data on the LAN.
sendHubCommand(new physicalgraph.device.HubAction(msg, physicalgraph.device.Protocol.LAN, "${ip}:39501"))
I am not sure about how @krlaframboise's Other Hub software works... It might be a better option as you could replicate the Hubitat Hub's 'Harmony Activity Switches' back into ST, where they could then be manipulated by the Logitech Harmony Connect integration directly. Again, that's if the 'Other Hub' integration does not use HubAction as well.
A nice metal box over top of it sure would reduce the 2.4ghz interference. 
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We just had a big discussion about this yesterday. Check this thread:
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I saw that... and thought this was that...
Brain isn't firing on all cylinders this week...
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If you find what energizes the other cylinders, share. Mine could use it. 
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Cannot brain today. I have the dumb.
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Do you know if Harmony hub broadcasts anything over the LAN when it changes activities or turns off? I know it does something becuase the Harmony app on my phone updates immediately when using the remote to change stuff. Would be nice if there was a way to listen to whatever status update that is.
I have a CLI installed on my Pi that I can use to send commands to the hub, they could be tied to virtual switches to where when you turn a switch on it sends a command. That's still one-way though unless there's a broadcast message to listen to.
Do you mean something like this?
Some of us tried this solution early on, and found the ‘harmony-api’ server would cause the Harmony Hub to slow down over time. When the ported ST solution came out, most of us just switched to that.
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I posted a "hybrid" instant update solution to the "Instant Update" thread. It works great for me and I dont have to turn on my ST hub.
Great idea! I might copy it 
I considered throwing together a simple smartApp for ST that would remove the need for webCore and send the httpGet request directly, but with ST in flux, I decided it's probably a waste of time. Who knows when they are going to flip the switch on ending the classic app.
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webCoRE is easy enough. No need to reinvent the wheel 
So it polls periodically? I was hoping that Harmony would broadcast something when activities were changed rather than polling for frequent updates.
It clearly does broadcast something since the phone app updates immediately when changing stuff with the physical remote, just a question of whether or not it's something that could be captured.
That's a great question and would probably require a packet sniffer, like WireShark, to see if there is some sort of broadcast each time an activity changes.
I am not convinced, however, that what you're seeing on your phone is a local LAN broadcast... Can you run a quick test? Try turning OFF the WiFi on your phone. Then, start up the Harmony App on your phone and connect to your Harmony Hub. Next, using the Harmony physical remote control, change the Activity. Watch you phone and report back whether or not the Harmony App on your phone reflects the Activity change immediately.
[Update: I just called home (my phone is on LTE) and had my wife change the current Activity and my phone's Harmony App reflected the change immediately. So, I am left to believe that the Harmony App communicates to the Harmony hub via the Harmony Cloud...at least when it has to!]
I guess another test would be to disable data on a cell phone and leave wifi on. If the same occurs we know there is also a lan route for updates.....or test with a tablet.
That would be a good test, but only if you disabled the Internet connection for your house first. Otherwise the Harmony Hub and Harmony Mobile App will both still have a path back to the Harmony Cloud.
As usual, you have seen what I have overlooked. 
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