Pocket Minecraft Protocol

string: int16 length prefix, counts number of bytes following.

MAGIC: 16 bytes of data, always hex 00ffff00fefefefefdfdfdfd12345678

Packet structure:

• int8 (packet type ID?)
• payload?

0x02 - client broadcast query:

• int8 = 0x02 (packet type ID)
• int64 = ping ID (client seems to use time in milliseconds since the program was started)
• MAGIC

UDP packet broadcast to port 19132, 25 bytes long. Connection ident changes each time - seems to increment by some amount that relates to time.

0x1d - server query response:

• int8 = 0x1d (packet type ID)
• int64 = ping ID from client
• int64 = server ID
• MAGIC
• string ("MCCPP;Demo;" + Username)

UDP packet sent to port/address that sent query. Probably variable length given the strings.

0x05 - mtu sizing request:

• int8 = 0x05
• MAGIC
• int8 = 0x04 (unknown meaning)

Sent from client after it receives packet 0x1d. The client will repeatedly send this with reducing sizes until it successfully receives a reply.

0x06 - server mtu sizing response:

• int8 = 0x06 (packet type ID)
• MAGIC
• int64 server ID
• int8 = 0 (unknown meaning)
• int16 = total bytes received in MTU sizing packet (i.e determined MTU size)

Sent from server after it receives packet 0x05.