diff --git a/lib/src/main/java/io/github/lonamiwebs/overgram/Overgram.java b/lib/src/main/java/io/github/lonamiwebs/overgram/Overgram.java
index a48ab8a..8807b08 100644
--- a/lib/src/main/java/io/github/lonamiwebs/overgram/Overgram.java
+++ b/lib/src/main/java/io/github/lonamiwebs/overgram/Overgram.java
@@ -1,22 +1,18 @@
 package io.github.lonamiwebs.overgram;
 
-import io.github.lonamiwebs.overgram.crypto.Authenticator;
-import io.github.lonamiwebs.overgram.network.MTProtoPlainSender;
-import io.github.lonamiwebs.overgram.network.connection.Connection;
+import io.github.lonamiwebs.overgram.network.MTProtoSender;
+import io.github.lonamiwebs.overgram.network.MTProtoState;
 import io.github.lonamiwebs.overgram.network.connection.TcpFull;
 
 import java.io.IOException;
 
 public class Overgram {
-    public static void main(final String... args) throws IOException, ClassNotFoundException {
-        final Connection connection = new TcpFull();
+    public static void main(final String... args) throws IOException {
+        final MTProtoSender sender = new MTProtoSender(new MTProtoState(), new TcpFull());
         try {
-            connection.connect("149.154.167.91", 443);
-
-            final MTProtoPlainSender sender = new MTProtoPlainSender(connection);
-            Authenticator.doAuthentication(sender);
+            sender.connect("149.154.167.91", 443);
         } finally {
-            connection.disconnect();
+            sender.disconnect();
         }
     }
 }
diff --git a/lib/src/main/java/io/github/lonamiwebs/overgram/network/MTProtoSender.java b/lib/src/main/java/io/github/lonamiwebs/overgram/network/MTProtoSender.java
new file mode 100644
index 0000000..105cadc
--- /dev/null
+++ b/lib/src/main/java/io/github/lonamiwebs/overgram/network/MTProtoSender.java
@@ -0,0 +1,349 @@
+package io.github.lonamiwebs.overgram.network;
+
+import io.github.lonamiwebs.overgram.crypto.Authenticator;
+import io.github.lonamiwebs.overgram.network.connection.Connection;
+import io.github.lonamiwebs.overgram.tl.*;
+import io.github.lonamiwebs.overgram.utils.BinaryReader;
+
+import javax.naming.OperationNotSupportedException;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.concurrent.*;
+
+public class MTProtoSender {
+    private final MTProtoState state;
+    private final Connection connection;
+    private String ip;
+    private int port;
+    private boolean userConnected;
+    private boolean reconnecting;
+
+    private Thread sendHandle;
+    private Thread recvHandle;
+    private BlockingQueue<TLMessage> sendQueue;
+    private HashMap<Long, TLMessage> pendingMessages;
+    private HashSet<Long> pendingAck;
+    private TLMessage lastAck; // to acknowledge acknowledgements
+
+    public int retries = 5;
+
+    public MTProtoSender(final MTProtoState state, final Connection connection) {
+        this.state = state;
+        this.connection = connection;
+
+        sendQueue = new LinkedBlockingQueue();
+        pendingMessages = new HashMap<>();
+        pendingAck = new HashSet<>();
+    }
+
+    public void connect(final String ip, final int port) throws IOException {
+        this.ip = ip;
+        this.port = port;
+        userConnected = true;
+        doConnect();
+    }
+
+    private void doConnect() throws IOException {
+        boolean success = false;
+        for (int i = 0; i < retries; ++i) {
+            try {
+                connection.connect(ip, port);
+                success = true;
+                break;
+            } catch (IOException ignored) {
+            }
+        }
+        if (!success) {
+            throw new IOException("Failed to connect " + retries + " times");
+        }
+
+        if (state.authKey == null) {
+            final MTProtoPlainSender plain = new MTProtoPlainSender(connection);
+            success = false;
+            for (int i = 0; i < retries; ++i) {
+                try {
+                    state.authKey = Authenticator.doAuthentication(plain);
+                    success = true;
+                    break;
+                } catch (SecurityException | IOException | ClassNotFoundException ignored) {
+                }
+            }
+
+            if (!success) {
+                disconnect();
+                throw new IOException("Failed to generate AuthKey");
+            }
+        }
+
+        sendHandle = new Thread(this::sendLoop);
+        sendHandle.setDaemon(true);
+        sendHandle.start();
+
+        recvHandle = new Thread(this::recvLoop);
+        recvHandle.setDaemon(true);
+        recvHandle.start();
+    }
+
+    public void disconnect() {
+        if (!userConnected) {
+            doDisconnect();
+        }
+    }
+
+    private void doDisconnect() {
+        userConnected = false;
+        connection.disconnect();
+        pendingMessages.clear();
+        pendingAck.clear();
+        lastAck = null;
+        stopHandles();
+    }
+
+    private void stopHandles() {
+        if (sendHandle != null) {
+            sendHandle.interrupt();
+            try {
+                sendHandle.join();
+            } catch (InterruptedException ignored) {
+            }
+        }
+
+        if (recvHandle != null) {
+            recvHandle.interrupt();
+            try {
+                recvHandle.join();
+            } catch (InterruptedException ignored) {
+            }
+        }
+    }
+
+    private void doReconnect() {
+        if (userConnected) {
+            final Thread thread = new Thread(this::reconnect);
+            thread.setDaemon(true);
+            thread.start();
+        }
+    }
+
+    private void reconnect() {
+        reconnecting = true;
+        stopHandles();
+        connection.disconnect();
+        reconnecting = false;
+
+        try {
+            doConnect();
+        } catch (IOException ignored) {
+            doDisconnect();
+        }
+    }
+
+    public Future send(TLRequest request) throws IOException {
+        if (!userConnected) {
+            throw new IOException("Not connected");
+        }
+
+        final TLMessage message = state.createMessage(request);
+        pendingMessages.put(message.id, message);
+        try {
+            sendQueue.put(message);
+        } catch (InterruptedException ignored) {
+            throw new IOException("Failed to put message");
+        }
+
+        return message.future;
+    }
+
+    private void sendLoop() {
+        while (userConnected) {
+            if (!pendingAck.isEmpty()) {
+                lastAck = state.createMessage(new Types.MsgsAck().msgIds(new ArrayList<>(pendingAck)));
+                try {
+                    sendQueue.put(lastAck);
+                } catch (InterruptedException ignored) {
+                    doDisconnect();
+                    return;
+                }
+            }
+
+            final TLMessage message;
+            try {
+                message = sendQueue.poll(1, TimeUnit.SECONDS);
+                if (message == null) {
+                    continue;
+                }
+            } catch (InterruptedException ignored) {
+                doDisconnect();
+                return;
+            }
+
+            final byte[] body = state.packMessage(message);
+            while (!message.future.isCancelled()) {
+                try {
+                    connection.send(body);
+                } catch (IOException ignored) {
+                    try {
+                        Thread.sleep(1000);
+                        doReconnect();
+                        return;
+                    } catch (InterruptedException ignored2) {
+                        doDisconnect();
+                        return;
+                    }
+                }
+            }
+        }
+    }
+
+
+    private void recvLoop() {
+        while (userConnected) {
+            final byte[] body;
+            try {
+                body = connection.recv();
+            } catch (IOException ignored) {
+                doReconnect();
+                return;
+            }
+
+            final TLMessage message = state.unpackMessage(body);
+            try {
+                processMessage(message);
+            } catch (InterruptedException ignored) {
+                doDisconnect();
+                return;
+            }
+        }
+    }
+
+    private void processMessage(final TLMessage message) throws InterruptedException {
+        pendingAck.add(message.id);
+        if (message.object instanceof RpcResult) {
+            handleRpcResult(message);
+        } else if (message.object instanceof MessageContainer) {
+            handleContainer(message);
+        } else if (message.object instanceof GzipPacked) {
+            handleGzipPacked(message);
+        } else if (message.object instanceof Types.MsgsAck) {
+            handleAck(message);
+        } else if (message.object instanceof Abstract.Updates || message.object instanceof Abstract.Update) {
+            handleUpdate(message);
+        } else if (message.object instanceof Types.Pong) {
+            handlePong(message);
+        } else if (message.object instanceof Types.BadServerSalt) {
+            handleBadServerSalt(message);
+        } else if (message.object instanceof Types.BadMsgNotification) {
+            handleBadNotification(message);
+        } else if (message.object instanceof Types.MsgDetailedInfo) {
+            handleDetailedInfo(message);
+        } else if (message.object instanceof Types.MsgNewDetailedInfo) {
+            handleNewDetailedInfo(message);
+        } else if (message.object instanceof Types.NewSessionCreated) {
+            handleNewSessionCreated(message);
+        } else if (message.object instanceof Types.FutureSalts) {
+            handleFutureSalts(message);
+        } else if (message.object instanceof Types.MsgsStateReq) {
+            handleStateForgotten(message);
+        } else if (message.object instanceof Types.MsgResendReq) {
+            handleStateForgotten(message);
+        } else if (message.object instanceof Types.MsgsAllInfo) {
+            handleMsgAll(message);
+        }
+    }
+
+    private void handleRpcResult(final TLMessage message) {
+        final RpcResult result = (RpcResult) message.object;
+        final TLMessage replyMessage = pendingMessages.remove(result.reqMsgId());
+
+        // TODO RPC error
+        final BinaryReader reader = new BinaryReader(ByteBuffer.wrap(result.result()));
+        replyMessage.future.complete(((TLRequest) replyMessage.object).readResult(reader));
+    }
+
+    public void handleContainer(final TLMessage message) throws InterruptedException {
+        final MessageContainer result = (MessageContainer) message.object;
+        for (final TLMessage innerMessage : result.messages()) {
+            processMessage(innerMessage);
+        }
+    }
+
+    public void handleGzipPacked(final TLMessage message) throws InterruptedException {
+        final GzipPacked result = (GzipPacked) message.object;
+        message.object = result.packedObject();
+        processMessage(message);
+    }
+
+    public void handleUpdate(final TLMessage message) {
+    }
+
+    public void handlePong(final TLMessage message) {
+        final Types.Pong result = (Types.Pong) message.object;
+        final TLMessage replyMessage = pendingMessages.remove(result.msgId());
+        if (replyMessage != null) {
+            replyMessage.future.complete(result);
+        }
+    }
+
+    public void handleBadServerSalt(final TLMessage message) throws InterruptedException {
+        final Types.BadServerSalt result = (Types.BadServerSalt) message.object;
+        state.salt = result.newServerSalt();
+        if (lastAck != null && result.badMsgId() == lastAck.id) {
+            sendQueue.put(lastAck);
+        }
+
+        final TLMessage badMessage = pendingMessages.get(result.badMsgId());
+        if (badMessage != null) {
+            sendQueue.put(badMessage);
+        }
+    }
+
+    public void handleBadNotification(final TLMessage message) {
+        final Types.BadMsgNotification result = (Types.BadMsgNotification) message.object;
+        final TLMessage badMessage = pendingMessages.get(result.badMsgId());
+
+        if (result.errorCode() == 16 || result.errorCode() == 17) {
+            if (badMessage != null) {
+                // resend and update time offset
+                throw new UnsupportedOperationException();
+            }
+            return;
+        }
+
+        throw new UnsupportedOperationException();
+    }
+
+    public void handleDetailedInfo(final TLMessage message) {
+        final Types.MsgDetailedInfo result = (Types.MsgDetailedInfo) message.object;
+        pendingAck.add(result.answerMsgId());
+    }
+
+    public void handleNewDetailedInfo(final TLMessage message) {
+        final Types.MsgNewDetailedInfo result = (Types.MsgNewDetailedInfo) message.object;
+        pendingAck.add(result.answerMsgId());
+    }
+
+    public void handleNewSessionCreated(final TLMessage message) {
+        final Types.NewSessionCreated result = (Types.NewSessionCreated) message.object;
+        state.salt = result.serverSalt();
+    }
+
+    public void handleAck(final TLMessage message) {
+        // check if ack-ed logout
+    }
+
+    public void handleFutureSalts(final TLMessage message) {
+        // check if there's request
+    }
+
+    public void handleStateForgotten(final TLMessage message) {
+        // send MsgsStateInfo(req_msg_id=message.msg_id, info=chr(1) * len(message.obj.msg_ids)
+    }
+
+    public void handleMsgAll(final TLMessage message) {
+        // send MsgsStateInfo(req_msg_id=message.msg_id, info=chr(1) * len(message.obj.msg_ids)
+    }
+}
diff --git a/lib/src/main/java/io/github/lonamiwebs/overgram/network/MTProtoState.java b/lib/src/main/java/io/github/lonamiwebs/overgram/network/MTProtoState.java
index 76fa68b..2a9ea49 100644
--- a/lib/src/main/java/io/github/lonamiwebs/overgram/network/MTProtoState.java
+++ b/lib/src/main/java/io/github/lonamiwebs/overgram/network/MTProtoState.java
@@ -1,11 +1,15 @@
 package io.github.lonamiwebs.overgram.network;
 
+import io.github.lonamiwebs.overgram.crypto.AuthKey;
+import io.github.lonamiwebs.overgram.tl.TLMessage;
 import io.github.lonamiwebs.overgram.tl.TLObject;
 
 import java.security.SecureRandom;
 
 public class MTProtoState {
 
+    public AuthKey authKey;
+    public long salt;
     private final long id;
     private long timeOffset;
     private int sequence;
@@ -16,11 +20,11 @@ public class MTProtoState {
         timeOffset = 0;
         sequence = 0;
         lastMsgId = 0;
-
-        // TODO auth_key, salt
+        authKey = null;
+        salt = 0;
     }
 
-    public Object createMessage(final TLObject object, final long afterId) {
+    public TLMessage createMessage(final TLObject object) {
         throw new UnsupportedOperationException();
     }
 
@@ -28,11 +32,11 @@ public class MTProtoState {
         throw new UnsupportedOperationException();
     }
 
-    public byte[] packMessage(final Object message) {
+    public byte[] packMessage(final TLMessage message) {
         throw new UnsupportedOperationException();
     }
 
-    public Object unpackMessage(final byte[] body) {
+    public TLMessage unpackMessage(final byte[] body) {
         throw new UnsupportedOperationException();
     }
 
diff --git a/lib/src/main/java/io/github/lonamiwebs/overgram/tl/GzipPacked.java b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/GzipPacked.java
new file mode 100644
index 0000000..bb087a9
--- /dev/null
+++ b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/GzipPacked.java
@@ -0,0 +1,22 @@
+package io.github.lonamiwebs.overgram.tl;
+
+import io.github.lonamiwebs.overgram.utils.BinaryReader;
+import io.github.lonamiwebs.overgram.utils.BinaryWriter;
+
+public class GzipPacked extends TLObject {
+    public static final int CONSTRUCTOR_ID = 812830625;
+
+    @Override
+    public void serialize(BinaryWriter writer) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void deserialize(BinaryReader reader) throws ClassNotFoundException {
+        throw new UnsupportedOperationException();
+    }
+
+    public TLObject packedObject() {
+        throw new UnsupportedOperationException();
+    }
+}
diff --git a/lib/src/main/java/io/github/lonamiwebs/overgram/tl/MessageContainer.java b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/MessageContainer.java
new file mode 100644
index 0000000..8507cc9
--- /dev/null
+++ b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/MessageContainer.java
@@ -0,0 +1,24 @@
+package io.github.lonamiwebs.overgram.tl;
+
+import io.github.lonamiwebs.overgram.utils.BinaryReader;
+import io.github.lonamiwebs.overgram.utils.BinaryWriter;
+
+import java.util.List;
+
+public class MessageContainer extends TLObject {
+    public static final int CONSTRUCTOR_ID = 1945237724;
+
+    @Override
+    public void serialize(BinaryWriter writer) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void deserialize(BinaryReader reader) throws ClassNotFoundException {
+        throw new UnsupportedOperationException();
+    }
+
+    public List<TLMessage> messages() {
+        throw new UnsupportedOperationException();
+    }
+}
diff --git a/lib/src/main/java/io/github/lonamiwebs/overgram/tl/RpcResult.java b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/RpcResult.java
new file mode 100644
index 0000000..1793a24
--- /dev/null
+++ b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/RpcResult.java
@@ -0,0 +1,26 @@
+package io.github.lonamiwebs.overgram.tl;
+
+import io.github.lonamiwebs.overgram.utils.BinaryReader;
+import io.github.lonamiwebs.overgram.utils.BinaryWriter;
+
+public class RpcResult extends TLObject {
+    public static final int CONSTRUCTOR_ID = -212046591;
+
+    @Override
+    public void serialize(BinaryWriter writer) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void deserialize(BinaryReader reader) throws ClassNotFoundException {
+        throw new UnsupportedOperationException();
+    }
+
+    public long reqMsgId() {
+        throw new UnsupportedOperationException();
+    }
+
+    public byte[] result() {
+        throw new UnsupportedOperationException();
+    }
+}
diff --git a/lib/src/main/java/io/github/lonamiwebs/overgram/tl/TLMessage.java b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/TLMessage.java
new file mode 100644
index 0000000..3c50f44
--- /dev/null
+++ b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/TLMessage.java
@@ -0,0 +1,10 @@
+package io.github.lonamiwebs.overgram.tl;
+
+import java.util.concurrent.CompletableFuture;
+
+public class TLMessage {
+    public CompletableFuture<Object> future;
+    public long id;
+
+    public TLObject object;
+}
diff --git a/lib/src/main/java/io/github/lonamiwebs/overgram/tl/TLRequest.java b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/TLRequest.java
index 2a9249c..acb1787 100644
--- a/lib/src/main/java/io/github/lonamiwebs/overgram/tl/TLRequest.java
+++ b/lib/src/main/java/io/github/lonamiwebs/overgram/tl/TLRequest.java
@@ -1,4 +1,7 @@
 package io.github.lonamiwebs.overgram.tl;
 
-public abstract class TLRequest extends TLObject {
+import io.github.lonamiwebs.overgram.utils.BinaryReader;
+
+public abstract class TLRequest<T extends TLObject> extends TLObject {
+    public abstract T readResult(final BinaryReader reader);
 }