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How to route messages between clients using a central server in Python

I've got three Raspberry Pis sitting around. I want 2 of them to be able to chat while the 3rd routes the messages (acts as a server between them). The general flow of events should be something like ...
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Handling Server Response Timeouts [duplicate]

Consider the following scenario : User sends a request to transfer money. Server receives the request and transfers the money but the reply times out. The app reports failure. So the user tries to ...