ASPReactDemo/Api/SignalR/WeatherUpdateHub.cs

using Microsoft.AspNetCore.SignalR;

namespace Api.SignalR
{
    public class WeatherUpdateHub: Hub
    {
        // This method can be called by connected clients.
        public async Task SendMessage(string user, string message)
        {
            // Broadcast the message to all connected clients.
            await Clients.All.SendAsync("ReceiveMessage", user, message);
        }
        
        public async Task SendProgressUpdate(string message)
        {
            // Send a message to the caller.
            await Clients.Caller.SendAsync("ProgressUpdate", message);
        }
    }
}