Player Movement

Packet ID	Direction	Mojang Name	MCP Name
0x0A	Both	MovePlayerPacket	Packet10Flying

This packet is sent to the server to determine if the player is on the ground or airborne.

WARNING

This value is unreliable for fall damage and cheat detection as it can be spoofed by the client.

Clientbound

Field	Type	Description
On Ground	Boolean	false for walking/swimming, true for jumping/falling

MISSING

It's currently untested what the client does when it receives an OnGround packet. Most likely it just resets its vertical velocity.

Serverbound

Field	Type	Description
On Ground	Boolean	false for walking/swimming, true for jumping/falling

Example Packet

Field	Value
On Ground	true