Login Flow

The general order of packets used to log in is usually:

• C->S Handshake
• S->C Handshake
• C->S Login
• S->C Login
• S->C Spawn Point
• S->C Time
• S->C Health
• S->C Window Items

This is followed by a bunch of Pre-Chunk packets to load the chunks, and Chunk packets which contain the actual chunk data.

Minimal Login

The bare minimum to join a Server with a vanilla client is:

• C->S Handshake
• S->C Handshake
• C->S Login
• S->C Login
• S->C Player Position and Look

A vanilla client will become responsive upon receiving the player's initial starting position and rotation from the server. After this, the client will continuously send Position and Look packets.