Dec 18, 2017 05:19 AM|Fei Han - MSFT|LINK
According to your description, I can know that you have a SignalR Hub server and different Client apps that connect to your Hub server, and Hub server can push JSON structure data/message to UWP client, pushing functionality is not working as expected in
your Xamarin app.
Messages over 2GB in size are not supported
To troubleshoot the issue, you can try to debug and trace the message that you need to pushed to the clients and check the real size of the message/data in your hub method. Besides, please try to push plain text testing message to your Xamarin clients, such
as “hello”, and check if clients can receive the message without error.