Okay I will take a stab at this but can use some help as I’m a bit rusty. @JDRoberts may be able to shed more light on the subject. Let’s start with the big picture. What you need to do is get both ZigBee devices to join the SmartThings ZigBee network. The challenge here is you must use the USB stick to configure the power plug’s ZigBee radio with the security settings SmartThings requires. Once you give it that configuration you will no longer be able to talk to it until both devices join the SmartThings ZigBee network. You can get yourself into a situation where the two devices are bricked and useless unless you can do some type of out of band reset to start over.
The security settings are in the XML configuration file found in this post I made a couple of years ago. You will not be able to just load the older config files into your device’s radios. You will have to make the changes manually for each parameter.
A lot of water has gone under the bridge since I designed my last ZigBee device for SmartThings. One thing they added about a year ago is support for the ZigBee leave network command. If the cloud doesn’t like a ZigBee device it can send a ZigBee leave network command to force it off the network. I don’t know what triggers this. However, it is possible that something in the SmartThings cloud sees the power plug, decides it’s not a supported device, and sends the leave network command. This will cause your device to connect work for a few minutes and then just disappear. I don’t know if they are doing this now or not but they were headed down that road. Just a heads up.
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