Real-time messaging for crossplatform application with asp.core backend

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Mobile

cross-platform

messaging

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I have app for 3 platforms: UWP, iOS and Android, Backend - ASP.Core 2.0. Generally speaking, the application allows to manage some "events": users can create some events, invite to events etc. I am going to add a possibility for users to comment events in real-time.

What is the best way to implement it: should I use Service Bus, SignalR or something else? Thanks.

What I have tried:

I am trying to find the best way to implement it.