Create a real chat application between 2 clients or more

I have a web application created with angularJS/php5 and a mobile app with(ionic) I want to create a real chat application between this 2 clients,in which part should I create this service??I can have many clients conncted from their mobile
I have read many articles about firebase,nodeJS,
have you any idea please how can I do that
thanks a lot

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