# Client Socket

> 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/clientsocket/

_Requires Symcon >= 2.0_

The client socket opens an interface, which is often used for communication between the gateway/ splitter instance and the connected device. It uses the TCP protocol.

### Integration in IP-Symcon
On the configuration page, the IP/ host name must be specified under "Host" and the port of the device to be controlled under "Port".

If SSL is activated, it can also be selected whether the host or peer should be 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/clientsocket/dde72561f0-1790424939/io-clientsocket.png)

## CSCK_SendText

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

`bool CSCK_SendText(int $InstanceID, string $Text)`

_Requires Symcon >= 2.0_

sends a string to the I/O

**Parameters**

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

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

The string to be sent

**Example**

```php
CSCK_SendText(12345, "Any data record"); // Sends the text "Any data record" on the client socket with the ID 12345
```