The plan is to make 2 chat applications.
I want to prototype support infrastructure of which user can open an app and then chat with the support that sits behind a web interface. Only 2 person could chat a same time (the user and the support).
I do not have credit card, hence Azure is not an option.
I cannot connect to office network from my phone and my own laptop so using local Wi - Fi is not convenience.
However, I can use my phone data plan and USB tether my laptop to connect to an online server.
My dream solution would something like Bluetooth chat between the Android/iOS app and the web interface.
Or, using a thing like DigitalOcean as a server (both cellphone and the laptop will connect to the same server).
However, I need a guidance and probably tutorials. I have done reading this book, https://www.packtpub.com/application-development/xamarin-cross-platform-application-development-second-edition and make a simple chat application. However there is little information on how to make chat application without Azure.