Connecting 4 plcs from 4 different cities to a single ignition gateway

I and my team have converted 4 Raspberry pi’s into PLC’s and these devices are in 4 different locations. The process for one Raspberry pi is coded in ladder logic using codesys and connected to ignition through opc ua. Now i need to connect all these devices which are in different cities or get the tags from all these 4 devices from different cities to a single ignition gateway. Can anyone please help me with this?

Thank you in Advance

It’s a newer project, but since you’re using codesys, you might want to look at this instead of OPC UA:

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Thank you