---
title: Keep Alive (serverbound)
description: "Play 0x1C, client → server."
---

`play` · `0x1C` · **serverbound** (client → server)

Response to a clientbound `KeepAlive`. `keepAliveId` must match the id the server sent. The server disconnects the client if no matching reply arrives within about 30 seconds; it also uses the round-trip time for the player's latency.

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

## Fields

| Field | Type | Notes |
|---|---|---|
| `keepAliveId` | Long | also `id` |

## Send it

```ts
client.on("KeepAlive", async (data) => {
  await client.sendPacket("KeepAlive", { keepAliveId: data.keepAliveId });
});
```

Echo the ID from the server's `KeepAlive` unchanged. The vanilla server kicks a client that answers with the wrong ID or does not answer in time.

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

Source: [`src/Core/Versions/776/Packets/play/serverbound/KeepAlive.ts`](https://github.com/GDLev/mc-protocol/blob/master/src/Core/Versions/776/Packets/play/serverbound/KeepAlive.ts)