Game Protocol FAQ

From ASSS Wiki

Contents 1 How are the news.txt and map checksums computed? 2 Why do I get disconnected for no data? 3 Why do I sometimes get two position packets with the same timestamp? 4 Can I get LVZ by using the VIE protocol? 5 Do file transfers use compression? 6 What port should I be using?

[edit] How are the news.txt and map checksums computed?

They both use a CRC32 algorithm. The popular zlib library has these functions.

[edit] Why do I get disconnected for no data?

Once you have entered an arena you must send position packets regularly to stay connected.

[edit] Why do I sometimes get two position packets with the same timestamp?

Chances are you got two 0x05 weapon packets or one 0x05 weapon and one 0x28 position. It is possible to fire a weapon right after the client has just sent a position.

[edit] Can I get LVZ by using the VIE protocol?

Yes, but you can either get all the LVZ, or none. You do not have a choice when it comes to optional LVZ. This currently only works on ASSS. See Game Protocol's login packet.

[edit] Do file transfers use compression?

The news.txt and the map are sent by the server compressed with zlib. All other filetrans are uncompressed.

[edit] What port should I be using?

Connect using the server's main port. Port + 1 is used for measuring pings and getting the player count.