public async Task <SessionView> CreateSessionChannelAsync(int indexEndpoint, string username, string password)
{
SessionView sessionView;
UserIdentity userI = new UserIdentity(username, password);
var endpoint = new ConfiguredEndpoint(null, endpoints[indexEndpoint]);
try
{
session = await Task.Run(() =>
{
return(Session.Create(config, endpoint, false, "OPC Client", 60000, userI, null));
});
if (session == null)
{
sessionView = null;
}
else
{
session.KeepAlive += OnKeepAliveHandler;
EndpointView endpointView =
new EndpointView(session.Endpoint.EndpointUrl, session.Endpoint.SecurityMode.ToString(), session.Endpoint.TransportProfileUri, 0, session.Endpoint.SecurityPolicyUri.Split('#')[1]);
sessionView =
new SessionView(session.SessionId.Identifier.ToString(), session.SessionId.NamespaceIndex.ToString(), session.SessionName, endpointView);
}
return(sessionView);
}
catch (ServiceResultException p)
{
throw new BadUserException(p.Message, p);
}
}
async void OnSelected(object sender, ItemTappedEventArgs e)
{
EndpointView selected = e.Item as EndpointView;
int i = storedList.endpointList.IndexOf(selected);
string action = null;
try
{
action = await DisplayActionSheet("Select authentication mode: ", "cancel", null, "Anonymous", "Username & Password");
if (action.Equals("Anonymous"))
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.ShowLoading();
});
try
{
sessionView = await Task.Run(() => client.CreateSessionChannelAsync(i));
}
catch (NotImplementedException)
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Error", "The Endpoint is not supported!", "ok");
return;
}
catch (UnsupportedEndpointException p)
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Error", p.Message, "ok");
return;
}
if (sessionView == null)
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Error", "Cannot connect to an OPC UA Server!", "OK");
}
else
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Info", "Session created successfully!", "Ok");
ContentPage sessionPage = new SessionPage(client, sessionView);
sessionPage.Title = "OPC Session Services";
await Navigation.PushAsync(sessionPage);
}
}
else if (action.Equals("Username & Password"))
{
var _loginPopup = new LoginPopupPage(client, i, sessionView);
await Navigation.PushPopupAsync(_loginPopup);
}
}
catch (NullReferenceException)
{
}
}