# WebSocket Client

> Symcon documentation · English · generated on 2026-09-26  
> Index: https://www.symcon.de/en/llms.txt

Source: https://www.symcon.de/en/service/documentation/module-reference/i-o-instances/websocketclient/

_Requires Symcon >= 5.5_

The WebSocket Client opens an interface which is often used for bidirectional communication with web applications/web servers. It uses the TCP protocol.

### Integration in IP-Symcon
The address of the web application/ web server must be specified under "URL" on the configuration page. If "Verify Certificates" is activated, the SSL certificates are checked.

Only a click on "Apply" saves the settings and then an attempt is made to establish the connection.

![Configuration page](https://www.symcon.de/media/pages/service/dokumentation/modulreferenz/io/websocketclient/aef056fc18-1790424939/io-websocketclient.png)

## WSC_SendMessage

Source: https://www.symcon.de/en/service/documentation/module-reference/i-o-instances/websocketclient/wsc-sendmessage/

`bool WSC_SendMessage(int $InstanceID, string $Message)`

_Requires Symcon >= 5.5_

sends a message using the WebSocket

**Parameters**

- `$InstanceID` (int): ID of the WebSocket client to be updated
- `$Message` (string): The string to be sent

**Returns** (bool): If the command succeeds, it returns __TRUE__, otherwise __FALSE__.

The string to be sent

**Example**

```php
// Sends the message "Hello World" to the WebSocket Client instance with ID 12345
WSC_SendMessage(12345, "Hello World");
```