Any tutorials on how to build a chat/messaging app?

I need to integrate a chat/messaging service into my app. It will be a one to many chat. A user will only be allowed to communicate to me, and I can communicate to anybody using the app.

Anybody have any good tutorials for this?

I also going to create a chat app in the upcoming period
I found this tutorial may help you

also , to finish your work faster - try to download a chat template from ionic marketplace