diff --git a/mods/utcp.py b/mods/utcp.py
index b13acd1..21053a5 100644
--- a/mods/utcp.py
+++ b/mods/utcp.py
@@ -8,6 +8,7 @@ import hashlib
 import simplecrypto
 from struct import Struct
 import uuid
+import bisect
 
 DATA_DIVIDE_LENGTH = 8000
 PACKET_HEADER_SIZE = 512                            # Pickle service info
@@ -17,16 +18,11 @@ LAST_CONNECTION = -1
 FIRST = 0
 PACKET_END = b'___+++^^^END^^^+++___'
 
-# need for emulate
-AF_INET = None
-SOCK_STREAM = None
-
 class Connection:
     SMALLEST_STARTING_SEQ = 0
     HIGHEST_STARTING_SEQ = 4294967295
     def __init__(self, remote, encrypted=False):
         self.peer_addr = remote
-        self.ack = 0
         self.seq = Connection.gen_starting_seq_num()
         self.my_key = None
         if encrypted:
@@ -36,7 +32,6 @@ class Connection:
         self.recv_lock = threading.Lock()
         self.send_lock = threading.Lock()
         self.packet_buffer = {
-            'SYN': [],
             'ACK': [],
             'SYN-ACK': [],
             'DATA': [],
@@ -52,43 +47,50 @@ class Connection:
         self.ack = ack
         return ack
 
-class Ack:
+class UTCPPacket:
+    def __cmp__(self, other):
+        return (self.seq > other.seq) - (self.seq < other.seq)
+
+class Ack(UTCPPacket):
     type = 'ACK'
-    def __init__(self, id_):
+    def __init__(self, id_, seq):
         self.id = id_
-class Fin:
+        self.seq = seq
+class Fin(UTCPPacket):
     type = 'FIN'
-    def __init__(self):
+    def __init__(self, seq):
         self.id = uuid.uuid4().bytes
-class FinAck:
+        self.seq = seq
+class FinAck(UTCPPacket):
     type = 'FIN-ACK'
-    def __init__(self, id_):
+    def __init__(self, id_, seq):
         self.id = id_
-class Syn:
+        self.seq = seq
+class Syn(UTCPPacket):
     type = 'SYN'
     checksum = None
-    def __init__(self):
+    def __init__(self, seq):
         self.id = uuid.uuid4().bytes
+        self.seq = seq
     def set_pub(self, pubkey):
         self.checksum = TCP.checksum(pubkey)
         self.pubkey = pubkey
-class SynAck:
+class SynAck(UTCPPacket):
     type = 'SYN-ACK'
     checksum = None
-    def __init__(self, id_):
+    def __init__(self, id_, seq):
         self.id = id_
+        self.seq = seq
     def set_pub(self, pubkey):
         self.checksum = TCP.checksum(pubkey)
         self.pubkey = pubkey
 
-class Packet:
-    def __init__(self):
+class Packet(UTCPPacket):
+    def __init__(self, seq):
         self.id = uuid.uuid4().bytes
-        self.flag_ack = 0
-        self.flag_syn = 0
-        self.flag_fin = 0
         self.checksum = 0
         self.data = b''
+        self.seq = seq
     def __repr__(self):
         return f'TCPpacket(type={self.packet_type()})'
 
@@ -164,13 +166,13 @@ class ConnectedSOCK(object):
         if not self.closed:
             conn = self.low_sock.connections[self.client_addr]
             with conn.recv_lock:
-                has_data = self.client_addr in self.packets_received['DATA or FIN']
+                has_data = len(conn.packet_buffer['DATA'])
             if has_data:
                 return True
             else:
                 self.incoming_packet_event.wait(timeout)
                 with conn.recv_lock:
-                    return self.client_addr in self.packets_received['DATA or FIN']
+                    return len(conn.packet_buffer['DATA'])
         return False
 
 class TCP(object):
@@ -188,19 +190,19 @@ class TCP(object):
         self.channel = None
         self.connections = {}
         self.connection_queue = []
-        self.packets_received = {'SYN': {}, 'ACK': {}, 'SYN-ACK': {}, 'DATA or FIN': {}, 'FIN-ACK': {}}
+        self.syn_received = {}
     def poll(self, timeout):
         if len(self.connections):
             connection = list(self.connections.keys())[0]
             conn = self.connections[connection]
             with conn.recv_lock:
-                has_data = connection in self.packets_received['DATA or FIN']
+                has_data = len(conn.packet_buffer['DATA'])
             if has_data:
                 return True
             else:
                 self.incoming_packet_event.wait(timeout)
                 with conn.recv_lock:
-                    return connection in self.packets_received['DATA or FIN']
+                    return len(conn.packet_buffer['DATA'])
         return False
     def get_free_port(self):
         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
@@ -274,7 +276,7 @@ class TCP(object):
                 else:
                     raise EOFError('Connection not in connected devices')
 
-            data = self.find_correct_packet('DATA or FIN', connection, size)
+            data = self.find_correct_packet('DATA', connection, size)
             if not self.status:
                 raise EOFError('Disconnecting')
             return data
@@ -375,8 +377,6 @@ class TCP(object):
         with self.connection_lock:
             if len(self.connections):
                 self.connections.pop(connection)
-            for k in list(self.packets_received.keys()):
-                self.packets_received[k].pop(connection)
     def close(self, connection=None):
         try:
             if connection not in list(self.connections.keys()):
@@ -434,12 +434,12 @@ class TCP(object):
             try:
                 not_found = False
                 if address[0] == 'Any':
-                    order = self.packets_received[condition].popitem()  # to reverse the tuple received
+                    order = self.syn_received.popitem()  # to reverse the tuple received
                     return order[1], order[0]
                 conn = self.connections[address]
                 if condition in ['ACK', 'SYN-ACK', 'FIN-ACK']:
                     tries += 1
-                if condition == 'DATA or FIN':
+                if condition == 'DATA':
                     with conn.recv_lock:
                         packet = self.packets_received[condition][address][:size]
                         self.packets_received[condition][address] = self.packets_received[condition][address][size:]
@@ -474,9 +474,9 @@ class TCP(object):
                 data_chunk = packet.data if not self.encrypted else conn.my_key.decrypt_raw(packet.data)
                 if data_chunk != PACKET_END:
                     with conn.recv_lock:
-                        if address not in self.packets_received['DATA or FIN']:
-                            self.packets_received['DATA or FIN'][address] = b''
-                        self.packets_received['DATA or FIN'][address] += data_chunk
+                        if address not in self.packets_received['DATA']:
+                            self.packets_received['DATA'][address] = b''
+                        self.packets_received['DATA'][address] += data_chunk
                 ack = Ack(packet.id)
                 self.send_ack(address, ack)
             self.blink_incoming_packet_event()