public override async Task OnConnectedAsync()
{
var currentUser = Context.User.GetUserName();
var isOnline = await _tracker.UserConnected(currentUser, Context.ConnectionId);
if (isOnline) //first login for this user, logging in to additional devices won't raise this flag
{
await Clients.Others.SendAsync("UserIsOnline", currentUser);
}
var currentUsers = await _tracker.GetConnectedUsers();
await Clients.Caller.SendAsync("GetOnlineUsers", currentUsers);
//await Clients.All.SendAsync("GetOnlineUsers", currentUsers);
}