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...To listen to messages that your app has access to receive, you can use the message() method which filters out events that aren’t of type message. message() accepts an optional pattern parameter of type string or RegExp object which filters out any messages that don’t match the pattern. A RegExp pattern can be used instead of a string for more granular matching. Within your listener function, say() is available whenever there is an associated conversation (for example, a conversation where the event or action which triggered the listener occurred). say() accepts a string to post simple messages and JSON payloads to send more complex messages. The message payload you pass in will be sent to the associated conversation.

...With basic Redux, only simple synchronous updates can be done by dispatching an action. By adding middleware, you extend the Redux store's abilities, enabling you to write async logic that interacts with the store. A thunk is a function that wraps an expression in order to delay its evaluation. Redux Thunk middleware allows you to write action creators that, rather than return an action will return a function instead. If you want to delay the dispatch of an action, or to dispatch only after meeting a certain condition, then the thunk can be used. Thunks are ideal middleware for a number of cases, in particular for basic Redux side effects logic, complex synchronous logic that must access the store, and simple async logic like AJAX requests.