Kevin beat me to it, here's a brief description on what to do. Your connection names can obviously be whatever you want.
- For communication between primary and secondary devices with different addresses/hostnames, create 3 device connections
- Device connection “A”
- Device connection “B”
- Device connection “Master”
- Connections “A” and “B” will only be used for reference to the diagnostics to determine a device connection
- Tags used throughout the project will reference the “Master” connection
- A Gateway Timer Script will run at a specific delay and will determine the correct hostname for the “Master” based on the connection for “A” and “B” and the pre-determined primary and secondary definitions (typically “A” is the primary and “B” is the secondary)
- If a connection to “A” is good, then use the hostname for “A”
- If a connection to “A” is not good and the connection to “B” is good, then use the hostname for “B”
- If neither connection to “A” nor “B” is good, then leave the hostname as-is
- Can have a delay to swap back to “A”