A data center provider uses Ignition for monitoring assets in their ownership. A client/customer that leases white space in the data center and also uses Ignition for assets in the whitespace that are owned by the client/customer.
The client/customer would like to ingest ignition data from the data center providers ignition into the client/customer's ignition. Each Ignition instance is on it's own.
What is the best way to share data center provider ignition with client/customer ignition?
The generic solution is to use WebDev in the data center provider Ignition instance to expose information via an API.
For simple cases, a shared database connection might suffice.
MQTT would also be an option. data center provider could run a broker where they can control access rights to the different topics.
Why not just use a gateway network connection with a remote tag provider?
Gateway Networks allow a lot more functionality than just tags, and would also preclude one org or the other from using the Enterprise module. Not a good fit for this, IMO.