The Survey plugin will go through your Indigo Devices, and “Ping” (Status Request) any devices that support the Status Request command. This allows you to get a survey of all your devices, and ensure that they are online easily.
Simply turn off a breaker, and then run a Survey through this plugin, it will cycle through each device, forcing a status request, and will report any devices that do not respond to the status request.
This should give you a list of devices that are on each breaker.
Use the "more info" link above to get the latest download.