**:bulb: See its usage example [below](#1-implementation-using-opencv-with-netgear-api)**
*`filter` (_string_): A custom user-defined filter to allow only specific Server port at the Clients-End in Multi-Server Mode. Therefore only Server port for certain signature/value will be allowed to send data to the client. It can be used as follows:
```python
options={multiserver_mode:True,filter:'5565'}#activate Multi-Server Mode and set filter to allow data from port 5565 only
options={'multiserver_mode':True,'filter':'5565'}#activate Multi-Server Mode and set filter to allow data from port 5565 only
```
**:bulb: See its usage example [below](#2-implementation-using-various-vidgear-apis-with-netgear-api)**