Chat

Play 0x09, client → server.

play · 0x09 · serverbound (client → server)

Sends a chat message typed by the player (max 256 characters). It includes timestamp, salt, an optional signature from the player’s chat session key, and the last-seen acknowledged bitset with offset and checksum. The server validates the signature and ordering, then broadcasts it as PlayerChat.

Sent by the client, read by the server. Listen for it with client.on("Chat", (data) => …) on the receiving side.

Fields

Send it

// Client side: unsigned chat, accepted by servers that do not enforce secure chat.
await client.sendPacket("Chat", {
  message: "hello",
  timestamp: BigInt(Date.now()),
  salt: 0n,
  signature: null,
  offset: 0,
  acknowledged: Buffer.alloc(3),
  checksum: 0,
});

signature is the 256-byte message signature or null for unsigned chat. offset and acknowledged describe which earlier messages the client has seen. A server that enforcesSecureChat rejects unsigned messages. Server side: read data.message and broadcast it with SystemChat or PlayerChat.

Field aliases listed under Notes are accepted as alternative keys when writing.

Source: src/Core/Versions/776/Packets/play/serverbound/Chat.ts