addresses connection issues

TLSharp.Core/Network/TcpTransport.cs

@@ -12,9 +12,13 @@ namespace TLSharp.Core.Network
 
     public class TcpTransport : IDisposable
     {
-        private readonly TcpClient tcpClient;
-        private readonly NetworkStream stream;
+        private TcpClient tcpClient;
+        private NetworkStream stream;
         private int sendCounter = 0;
+        TcpClientConnectionHandler handler;
+        readonly string address;
+        readonly int port;
+        readonly IPAddress ipAddress;
 
         public TcpTransport(string address, int port, TcpClientConnectionHandler handler = null)
         {
@@ -25,10 +29,13 @@ public TcpTransport(string address, int port, TcpClientConnectionHandler handler
 
                 tcpClient = new TcpClient(ipAddress.AddressFamily);
 
-                try {
-                    tcpClient.Connect (endpoint);
-                } catch (Exception ex) {
-                    throw new Exception ($"Problem when trying to connect to {endpoint}; either there's no internet connection or the IP address version is not compatible (if the latter, consider using DataCenterIPVersion enum)",
+                try
+                {
+                    tcpClient.Connect(endpoint);
+                }
+                catch (Exception ex)
+                {
+                    throw new Exception($"Problem when trying to connect to {endpoint}; either there's no internet connection or the IP address version is not compatible (if the latter, consider using DataCenterIPVersion enum)",
                                          ex);
                 }
             }
@@ -102,7 +109,7 @@ public bool IsConnected
         {
             get
             {
-                return this.tcpClient.Connected;
+                return this.tcpClient != null && this.tcpClient.Connected;
             }
         }
 

TLSharp.Core/TelegramClient.cs

@@ -32,6 +32,8 @@ public class TelegramClient : IDisposable
         private List<TLDcOption> dcOptions;
         private TcpClientConnectionHandler handler;
         private DataCenterIPVersion dcIpVersion;
+        private ISessionStore store;
+        string sessionUserId;
 
         public Session Session
         {
@@ -56,22 +58,30 @@ public TelegramClient(int apiId, string apiHash,
             if (string.IsNullOrEmpty(apiHash))
                 throw new MissingApiConfigurationException("API_HASH");
 
-            if (store == null)
-                store = new FileSessionStore();
+            this.store = store ?? new FileSessionStore();
+            this.sessionUserId = sessionUserId;
 
             this.apiHash = apiHash;
             this.apiId = apiId;
             this.handler = handler;
             this.dcIpVersion = dcIpVersion;
-
-            session = Session.TryLoadOrCreateNew(store, sessionUserId);
-            transport = new TcpTransport (session.DataCenter.Address, session.DataCenter.Port, this.handler);
         }
 
         public async Task ConnectAsync(bool reconnect = false, CancellationToken token = default(CancellationToken))
         {
             token.ThrowIfCancellationRequested();
 
+            //if (!transport.IsConnected)
+            //{
+            //    // we must recreate the session because it might track dirty information 
+            //    // of a connection that maybe was disconnected, reusing that session will cause errors
+            //    session = Session.TryLoadOrCreateNew(store, sessionUserId);
+            //    await transport.ConnectAsync();
+            //}
+
+            session = Session.TryLoadOrCreateNew(store, sessionUserId);
+            transport = new TcpTransport(session.DataCenter.Address, session.DataCenter.Port, this.handler);
+
             if (session.AuthKey == null || reconnect)
             {
                 var result = await Authenticator.DoAuthentication(transport, token).ConfigureAwait(false);
@@ -121,6 +131,8 @@ public TelegramClient(int apiId, string apiHash,
             else
                 dcs = dcOptions.Where(d => d.Id == dcId); // any
 
+            dcs = dcs.Where(d => !d.MediaOnly);
+
             TLDcOption dc;
             if (dcIpVersion != DataCenterIPVersion.Default)
             {
@@ -134,8 +146,9 @@ public TelegramClient(int apiId, string apiHash,
 
             var dataCenter = new DataCenter (dcId, dc.IpAddress, dc.Port);
 
-            transport = new TcpTransport(dc.IpAddress, dc.Port, handler);
+            //transport = new TcpTransport(dc.IpAddress, dc.Port, handler);
             session.DataCenter = dataCenter;
+            session.Save();
 
             await ConnectAsync(true, token).ConfigureAwait(false);