Add connection timeout

TcpService.cs

@@ -12,6 +12,8 @@ namespace Akari.Provider.WaveshareUART
 {
     public class TcpService
     {
+        public const int ConnectTimeout = 5_000;
+
         public FingerprintSensor FingerprintSensor => WaveshareUARTProvider.Instance.FingerprintSensor;
         public UsersManager UsersManager => WaveshareUARTProvider.Instance.UsersManager;
 
@@ -64,11 +66,17 @@ namespace Akari.Provider.WaveshareUART
 
         private void SendAuth(User user)
         {
-            using (var client = new TcpClient(_ip, _port))
+            using (var client = new TcpClient())
             {
+                if (!client.ConnectAsync(_ip, _port).Wait(ConnectTimeout))
+                {
+                    Console.WriteLine("Can't connect to server, timed out");
+
+                    return;
+                }
+
                 var stream = client.GetStream();
 
-                //var data = Convert.FromBase64String(user.Token);
                 var data = Encoding.UTF8.GetBytes($"{user.Name}${user.Token}");
 
                 stream.Write(data, 0, data.Length);