Pocket Edition Protocol Documentation

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Revision as of 00:27, 2 February 2015 by Gurun (talk | contribs) (Added link to automatically generated spec back (why the hell someone removed that i don't know). Also added link to MiNET wiki with further notes on the protocol.)
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This is the (unofficial) protocol docs for Minecraft: PE. The protocol currently uses UDP for communication, different from PC (TCP). The usual UDP issues are still here (lost packets, wrong order, etc.), but the protocol solves a few of those problems using special packet encapsulation, based on TCP. The Minecraft: PE client uses RakNet for it's networking library. Even though it uses RakNet, you can still write software without the library.


Data Types

Minecraft packets use different data types to communicate with each other. The documented ones are listed below:

Size Range Notes
byte 1 -128 to 127
short 2 -32768 to 32767
Integer 4 -2147483648 to 2147483647
Long 8
MAGIC 16 0x00ffff00fefefefefdfdfdfd12345678 always those hex bytes, corresponding to RakNet's default OFFLINE_MESSAGE_DATA_ID
string short + string N/A Prefixed by a short containing the length of the string in characters. It appears that only the following ASCII characters can be displayed: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~

Reference

RakNet datagram and message header information: http://im/raknet/manual/systemoverview.html

The latest version of the protocol is not fully documented yet, but all of the packets can be found in the Dragonet server code https://github.com/DragonetMC/Dragonet/tree/master/src/main/java/org/dragonet/net/packet

There is also an automatically generated specification of many of the packages can be found in the MiNET server code https://github.com/NiclasOlofsson/MiNET/blob/master/src/MiNET/MiNET/Net/MCPE%20Protocol%20Documentation.md

The MiNET wiki also contain development notes around some functionality https://github.com/NiclasOlofsson/MiNET/wiki These will be migrated to this wiki in due time.