> ## Documentation Index
> Fetch the complete documentation index at: https://developer.wooxpro.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Stay Connected And Limit

<aside class="warning">
  * If there is a network problem, the connection will be automatically disconnected,
    please set up the reconnection mechanism <br />
</aside>

### How Stay Connected

WebSocket uses the Ping/Pong mechanism to maintain the connection. Once the connection is opened, a Ping frame is sent every N seconds, and the remote endpoint will return a Pong frame to keep responding. This is an approach to stay active. It helps to keep the connection open, especially if there is a short timeout proxy on an inactive connection.

**If no data is returned after connecting to WebSocket, the link will be automatically disconnected after 20s. It is recommended that the user do the following:**

1. After each message is received, the user sets a timer for N seconds (N\<20).
2. If the timer is triggered (no new message is received within N seconds), send a ping frame or send a string 'ping'.
3. Expect for a text string 'pong' as a response. If not received within N seconds, please issue an error or reconnect.
4. We do not actively disconnect when there is a continuous message interaction between the two parties.

**The following is the data format of ping:** (Example in Java pseudocode)

* Standard Ping frame

<code>ws.send(new PingWebSocketFrame());</code>

* Ping Text

<code>ws.send(new TextWebSocketFrame('\{"action":"ping"}'));</code>

### Connection Limit

* A maximum of 500 connections can be maintained between each IP and WOO X Pro server.

#### Lifeless connection

Connection that do not send task subscription data within 5 seconds will be considered lifeless and the server will close the connection.