I bought one of these months ago to help with detective work but haven't used it yet.
I have something similar - works great! I would highly recommend it if you still have unmarked circuits.
I now have a house sketch with all plugs and their associated breakers, and also a spreadsheet that lists all plugs connected to each breaker. Extremely useful!
I am able to connect and generate the token ID, but when I try to get the device IDs, there is an error and the process fails. I saw some other posts about two Vues, but I have two of them. Could that be the issue? See below. I did not paste all of what was returned when getting the device IDs, just the last part.
dev:4312025-01-13 01:38:13.546 PMerrorError fetching device GID: Cannot get property 'channels' on null object
dev:4312025-01-13 01:38:13.545 PMdebug82195
dev:4312025-01-13 01:38:13.544 PMdebug19000
dev:4312025-01-13 01:38:12.758 PMdebug[{"battery":null,"channels":[{"channelMultiplier":1.0,"channelNum":"1,2,3","channelTypeGid":null,"deviceGid":19000,"name":null,"parentChannelNum":null,"type":"Main"}],"deviceConnected":{"connected":true,"deviceGid":19000,"offlineSince":null},"deviceGid":19000,"devices":[{"channels":[{"channelMultiplier":1.0,"channelNum":"1","channelTypeGid":20,"deviceGid":19000,"name":"Bonus Room","parentChannelNum":null,"type":"FiftyAmp"},{"channelMultiplier":1.0,"channelNum":"2","channelTypeGid":10,"deviceGid":19000,"name":"All Fridges","parentChannelNum":null,"type":"FiftyAmp"},{"channelMultiplier":2.0,"channelNum":"3","channelTypeGid":1,"deviceGid":19000,"name":"Attic AC Unit","parentChannelNum":"97","type":"FiftyAmp"},{"channelMultiplier":2.0,"channelNum":"4","channelTypeGid":4,"deviceGid":19000,"name":"Dryer","parentChannelNum":null,"type":"FiftyAmp"},{"channelMultiplier":2.0,"channelNum":"5","channelTypeGid":1,"deviceGid":19000,"name":"2nd Floor Outside AC","parentChannelNum":null,"type":"FiftyAmp"},{"channelMultiplier":1.0,"channelNum":"6","channelTypeGid":20,"deviceGid":19000,"name":"Coffee Nook","parentChannelNum":null,"type":"FiftyAmp"},{"channelMultiplier":1.0,"channelNum":"7","channelTypeGid":17,"deviceGid":19000,"name":"Kitchen Island & Micro","parentChannelNum":null,"type":"FiftyAmp"},{"channelMultiplier":2.0,"channelNum":"8","channelTypeGid":1,"deviceGid":19000,"name":"1st Floor Outide AC","parentChannelNum":"97","type":"FiftyAmp"},{"channelMultiplier":1.0,"channelNum":"9","channelTypeGid":16,"deviceGid":19000,"name":"Kitchen Counter Outlets","parentChannelNum":null,"type":"FiftyAmp"},{"channelMultiplier":1.0,"channelNum":"10","channelTypeGid":20,"deviceGid":19000,"name":"Master Bath Heater","parentChannelNum":null,"type":"FiftyAmp"},{"channelMultiplier":1.0,"channelNum":"11","channelTypeGid":20,"deviceGid":19000,"name":"Rear Bed, Bath 2","parentChannelNum":null,"type":"FiftyAmp"},
Hi all, In the linked post you will find my version for the EmporiaVue integration which is app-driver.
Release - EmporiaVue cloud integration - 
Get Help / Integrations - Hubitat
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I'm not sure if you having two vue devices is causing your NULL error or not. However, I frequently experienced a similar "NULL" value error with an Emporia Vue Utility Connect device using this driver. Hitting the "Refresh" command multiple times eventually returns the values for the device than it appears to run fine for a period of time. I don't know what causes the API to return an NULL value but rather than try and figure it out I created the specific driver for the [RELEASE] Emporia Vue Utility Connect Driver I added code that checks for NULL and auto-attempts a refresh up to 5 times that so far has always avoided the "Error" from occurring.
Mine either doesn't work or I have a f'd up electrical system. It triggers on the same breaker no matter where I plug the transmitter in. As a matter of fact, it triggers on same breaker even when transmitter isn't plugged in to anything.
Could be either of them! Or a defective unit… Hard to say!
I have 2 computers, 3 raspberry Pis, 3 UPS, a modem, router, & 2 switches plugged in across the plugs of that circuit. I wonder if any or all of that is causing interference. Some of them are plugged into first plugs of circuit. ChatGPT seems to think that is a viable cause.
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Any chance you can unplug them to test out that theory?
