Which combination of jabber-server + iOS client with support for certificates and push-notification should I choose?

Question

Ejabberd

Good afternoon!
You need to deploy a corporate jabber service. Clients are mostly mobile under iOS.
Prerequisites:
- certificate authentication,
- working push notifications,
- meaningful content of messages passes only through our server and only in encrypted form.
It is important that after interruption of communication on the device, offline messages reach the person, and he learns about it.
Desirable: the ability to manage contact lists of users, roster groups.
At the moment I'm considering Openfire and ejabberd as a server. You can also use something proprietary, if there is an option to try trial.
Who tried what? What are the results?
How can I implement my own IM server for text messaging with the iPhone client (push notifications are required)? - here kind people described in detail the essence of the problem and the possible architecture of the solution, but no one recommended specific software.
With Openfire, it is not yet clear how to attach push-notification to it. I didn't find a plugin. Maybe someone knows the solution?
I don’t really want to contact ejabberd, but if there is positive feedback on working with some kind of iOS client, share it.

Answer 1

I tried ejabberd - it's not stable, it will restart, then it won't.
Tried openfire and prosody. Both are fine, but push never figured out how to do it.
Of the clients for the iPhone, ChatSecure, Monal and AstraChat more or less work.
And how did you solve the problem of push notifications - without them, almost the whole idea is not needed ((