diff --git a/examples/download_map/download_map.py b/examples/download_map/download_map.py
index 9f0a622..2c34df3 100755
--- a/examples/download_map/download_map.py
+++ b/examples/download_map/download_map.py
@@ -1,14 +1,27 @@
 #!/usr/bin/env python
 
-import socket
+import socket, os
+
+from typing import Optional
 
 from twnet_parser.packet import TwPacket, parse7
 from twnet_parser.messages7.control.token import CtrlToken
 from twnet_parser.messages7.control.connect import CtrlConnect
 from twnet_parser.messages7.system.info import MsgInfo
+from twnet_parser.messages7.system.map_change import MsgMapChange
+from twnet_parser.messages7.system.request_map_data import MsgRequestMapData
 
-# TODO: import twnet_parser.constants.NET_MAX_PACKETSIZE
-NET_MAX_PACKETSIZE = 1400
+from twnet_parser.constants import NET_MAX_PACKETSIZE, NET_MAX_SEQUENCE
+
+def progress(have, want):
+    if os.name == 'nt':
+        os.system('cls')
+    else:
+        os.system('clear')
+    percent = int(100 * have / want)
+    bar = '=' * int(percent / 2)
+    bar = bar[0:-1] + '>'
+    print(f"[{bar:50}] {have}/{want} {percent}%")
 
 host = 'localhost'
 port = 8303
@@ -17,18 +30,30 @@ dest_srv = (host, port)
 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 sock.bind(('', 0))
 
+downloaded_chunks = 0
+downloaded_bytes = 0
+sent_vital = 0
+got_vital = 0
+got_seqs = set()
+map_info: Optional[MsgMapChange] = None
 my_token = b'\xff\xaa\xbb\xee'
 srv_token = b'\xff\xff\xff\xff'
 
 def send_msg(messages):
     global srv_token
+    global got_vital
+    global sent_vital
     if not isinstance(messages, list):
         messages = [messages]
     packet = TwPacket()
     packet.header.token = srv_token
     for msg in messages:
+        if hasattr(msg, 'header'):
+            if msg.header.flags.vital:
+                sent_vital += 1
+            msg.header.seq = sent_vital
         packet.messages.append(msg)
-    print(f"sending {packet.pack()}")
+    packet.header.ack = got_vital
     sock.sendto(packet.pack(), dest_srv)
 
 # TODO: we should be able to set this
@@ -40,20 +65,42 @@ send_msg(ctrl_token)
 while True:
     data, addr = sock.recvfrom(NET_MAX_PACKETSIZE)
     packet = parse7(data)
-    print(packet)
 
     for msg in packet.messages:
+        if hasattr(msg, 'header'):
+            if msg.header.flags.vital and not msg.header.flags.resend:
+                got_vital = (got_vital + 1) % NET_MAX_SEQUENCE
+            if msg.header.seq in got_seqs:
+                pass
+                # continue
+            got_seqs.add(msg.header.seq)
+
         if msg.message_name == 'token':
             srv_token = msg.response_token
-            print(f"got server token {srv_token}")
 
             ctrl_connect = CtrlConnect()
             ctrl_connect.response_token = my_token
             send_msg(ctrl_connect)
-        if msg.message_name == 'accept':
-            # TODO: make these default values
-            send_msg(MsgInfo(
-                    version = "0.7 802f1be60a05665f",
-                    client_version = 1797
-            ))
-            print("got accept")
+        elif msg.message_name == 'accept':
+            info = MsgInfo()
+            info.header.flags.vital = True
+            send_msg(info)
+        elif msg.message_name == 'map_change':
+            map_info = msg
+            req = MsgRequestMapData()
+            req.header.flags.vital = True
+            send_msg(req)
+        elif msg.message_name == 'map_data':
+            downloaded_chunks += 1
+            downloaded_bytes += msg.header.size
+            progress(downloaded_bytes, map_info.size)
+            if downloaded_bytes >= map_info.size:
+                print(f"finished downloading {map_info.name}")
+                continue
+            if downloaded_chunks % map_info.num_response_chunks_per_request == 0:
+                req = MsgRequestMapData()
+                req.header.flags.vital = True
+                send_msg(req)
+        elif msg.message_name == 'close':
+            print("disconnected")
+            exit(0)