All my devices are connected as of now, so will need to continue troubleshooting when/if one fails. I’ll also be getting a second hub for upstairs today so maybe coverage will improve overall once I add that. Thanks again…
Do you have any Mains powered Zigbee devices? Smart plugs are the most common, but also light switches, in wall relays, some plug-in sensors, some smart bulbs, although that can get tricky and depends on the brand.
Most people get good results with IKEA Smart plugs or third reality if you just want inexpensive Devices. A few people have had issues with the IKEA plugs, although that was more in Europe/UK.
Again, Zigbee is a mesh protocol, so normally you improve coverage by adding additional mains powered end devices, not additional hubs unless your house is made of cement or adobe. You can add more hubs if you want to, that is much easier in 2024 than it was back in 2015, but you typically shouldn’t have to.
Of course, it depends on local factors: if your house has leaded glass, lots of mirrors, inWall chicken wire lathing, metallic wallpaper, water features like fish tanks or waterfalls, that can all make it harder to get signal through.
yes… buy main powered zigbee devices vs a second hub. One item to note if you get the second hub - Routines using devices from multiple hubs do not run local (I believe that is still the case). So if you were to lose your internet… those Routines would not run.
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Shouldn’t he be able to set up the second hub in multi-hub mode where it will act as a repeater and not as a second primary hub?
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So far I have only the Aeotec hub, Xfinity window sensors, an Aeotec motion sensor, and two Honeywell T9 thermostats. The T9 upstairs isn’t being found by Smartthings so was wondering if it’s because the hub is downstairs, and that’s why I bought a second hub.
Don’t know. Things keep changing… I can’t keep track. 
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Please read The following post. It’s not about where your hub is. It’s about the backbone you have built to carry messages to that hub.
A Guide to Wireless Range & Repeaters - #11 by JDRoberts
On top of that, I’m confused. I thought the Honeywell T9 was a Wi-Fi device. If so, it doesn’t have anything to do with where the hub is, It’s just about the Wi-Fi signal to that device.
Will absolutely read it but busy moving 
You are correct, the T9 is a wifi device and works fine with their Resideo app, and I added the Resideo connector to Smartthings, but only one of the two thermostats shows up in Smartthings. Will have to tackle that another day.
Boy I am frustrated with SmartThings today! Now trying to add a Ring device and a Honeywell T9 Thermostat as linked services and both provide the same error:
Error code: UnhandledError
Very descriptive and helpful!
what is the Ring device?
what selection are you choosing when adding this device?
Ring Doorbell Pro 2
Resideo
I do have two drivers installed, wondering if they’re interfering:
TAustin Shared Projects and Mariano Shared Beta Driver
Wired or battery powered ?
Wired. Btw, I really appreciate yours and everyone’s help. Interesting and fun stuff but can be frustrating to setup.
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Since I was able to add a thermostat with Resideo yesterday I assume the integration generally works. Since the problems today, I removed the thermostat from ST but have been unable to re-add it, with the unhandledError condition. Not sure it’s a coincidence that it’s the same error I’m getting with Ring now, or if there’s a problem with my setup causing all service integrations to fail. Beginning to think I should just wipe it all and start over.
When you tried to add the Honeywell, which option did you select? There are two options.
I did a search for Honeywell T9 and found one option with Honeywell Home. It brings up the Resideo login page and allows me to log in. After accepting T&C it shows my two thermostats. When I hit connect I get the unhandledError. Doesn’t matter which thermostat I select or both.
Change your default browser on your phone to something else and try again.
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You are a genius! Changing default browser did the trick. Thanks!
Now all I have left are the original problems with disconnected Xfinity devices. Going to read the article now…
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@JDRoberts is quite the authority on wireless home automation protocols. I agree that it sounds like you need some mains powered devices to supplement your battery powered devices to build a strong mesh.
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