public async Task <XElement> SendMessageAsyncRetry(ParrotMessage message)
{
return(await Policy.Handle <System.Xml.XmlException>(e =>
{
Console.WriteLine($"SendMessageAsyncRetry Exception :: {e.Message}");
return true;
}).WaitAndRetryAsync(new[]
{
TimeSpan.FromMilliseconds(50),
TimeSpan.FromMilliseconds(100),
TimeSpan.FromMilliseconds(150)
}).ExecuteAsync(async() => await SendMessageAsync(message)));
}
/// <summary>
/// Sends a message to the Parrot RF Service.
/// </summary>
/// <param name="message"></param>
/// <returns></returns>
public async Task <XElement> SendMessageAsync(ParrotMessage message)
{
if (!BluetoothClient.Connected)
{
throw new Exception($"{nameof(ParrotClient)} is not connected.");
}
_waitingList.WaitOne();
try
{
// Debug message
Console.WriteLine($"=> Sending message '{message.Request}'");
// Send message to Parrot
var messageBytes = message.GetRequest();
await BluetoothClient.GetStream().WriteAsync(messageBytes, 0, messageBytes.Length);
await BluetoothClient.GetStream().FlushAsync();
// Hold response element
XElement answerElement;
// Hold notifications
var notifyElements = new List <XElement>();
// Receive response(s)
do
{
answerElement = XElement.Parse(await ReceiveResponseAsync());
// Find notificiations
if (answerElement.Name == "notify")
{
notifyElements.Add(answerElement);
}
else if (answerElement.Name == "answer")
{
var notifyElement = answerElement.XPathSelectElement("/notify");
if (notifyElement != null)
{
notifyElements.Add(notifyElement);
}
}
} while (answerElement.Name != "answer");
// Handle notifications
foreach (var notifyElement in notifyElements)
{
var notifyPath = notifyElement?.Attribute("path")?.Value;
if (notifyPath == null)
{
continue;
}
var resource = ResourceManager.Resources.FirstOrDefault(x => x.Value.Equals(notifyPath)).Key;
if (resource == ResourceType.UnknownResource && ZikApi.KnowMessages.Contains(notifyPath))
{
Console.WriteLine($"=> Received unhandled notification {resource} ({notifyPath})");
continue;
}
else if (resource == ResourceType.UnknownResource)
{
throw new UnknownNotificationException($"Received an unknown notification: {notifyPath}");
}
// Debug message
Console.WriteLine($"=> Dispatching notification {resource} ({notifyPath})");
NotificationEvent?.AsyncSafeInvoke(this, new NotifyEventArgs(resource, notifyPath));
}
// Return
return(answerElement);
}
finally
{
_waitingList.Release();
}
}
