If you didn’t read the intro on Mozaïk extension client, then you should consider reading it first.
When you register your extension’s client to Mozaïk, you have the ability to pass a mode which determine how the data will be pulled from your external service to Mozaïk.
push must be specified when you register a client to Mozaïk.
When using push mode
It’s useful when you communicate with an external service through websockets or if you want to connect Mozaïk to some sort of message queue.
The main difference with poll mode is that Mozaïk is no more responsible for fetching the data
at a given interval, your client acts as a producer and notify Mozaïk when it wants to push
some fresh data to its bound widgets.