Teeworlds 0.6 map download

Here is an example network traffic dump annotated using a twnet_parser script. The map download process is initiated if the map is changed or a client connects to the server. And the client does not know the map. Both times the server sends a NETMSG_MAP_CHANGE message where the client is supposed to answer with either NETMSG_CON_READY indicating that the client knows the map and is ready to enter or with NETMSG_REQUEST_MAP_DATA to start the map download process.

The message NETMSG_MAP_DATA has more fields than just chunk, data_size and last. But to keep the output simple I left those out.

            

    [TW6] 54939 -> 8303 connect
    [TW6] 8303 -> 54939 connect_accept
    [TW6] 54939 -> 8303 info
    [TW6] 8303 -> 54939 map_change
    [TW6] 54939 -> 8303 request_map_data (chunk=0)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=0 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=1)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=1 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=2)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=2 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=3)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=3 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=4)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=4 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=5)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=5 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=6)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=6 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=7)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=7 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=8)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=8 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=9)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=9 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=10)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=10 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=11)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=11 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=12)
    [TW6] 8303 -> 54939 map_data (last=0 chunk=12 data_size=896 ..)
    [TW6] 54939 -> 8303 request_map_data (chunk=13)
    [TW6] 8303 -> 54939 map_data (last=1 chunk=13 data_size=460 ..)
    [TW6] 54939 -> 8303 ready
    [TW6] 8303 -> 54939 sv_motd, con_ready
    [TW6] 54939 -> 8303 cl_start_info
    [TW6] 8303 -> 54939 sv_vote_clear_options, sv_tune_params
    [TW6] 54939 -> 8303 enter_game
            
        

As you can see the client has to request every individual chunk from the server. And the server then sets last to 1 when the last chunk of the map was sent. Informing the client that he now holds the complete map file.
The map being downloaded here is ctf5 with crc d92129a0.