Creating new adapters to connect to a different backend

To have the chat widget talk to a different backend, you should create a node module that exposes the following API:

Method	Returns	Description
`init(config)`	Promise	This method is called upon chat-widget initialization and should perform any tasks required to setup the connection with your backend. It receives a `config` JS object with whatever configuration you need to setup communication with your backend.
`send(data)`	Nothing	Method to send any `data` to your backend: usually you will send chat messages using this method.
`requestOlderMessages(data)`	Promise	Method to ask your backend for older messages. Usually `data` will contain a timestamp or message index to serve as the offset to the time in the older message list where you want the backend to send messages to your chat widget.
`on(event, callback)`	Nothing	Method to let the frontend chat-widget subscribe to events emitted from your backend adapter. The chat-widget subscribes to the `ucw:newRemoteMessage` event that your adapter should emit when a new message is received from the backend.

To see how this interface was implemented for a Rails Action Cable backend, see this code: https://github.com/catogonzalez/chat-adapter-action-cable/blob/master/src/adapter.js

The easiest way to start implementing a backend is by cloning the repo of one of the existing Adapaters:

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