Wifi packet capture

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Hello ,

i am working on a wifi module board which is provisioned to run at local wifi network . the board will act as server and mobile phone will be connected to same wifi network has an app will act as a client, now i need to capture rtsp packets which will be exchanged between my board and mobile device . i nee to capture the RTSP messages in wireshark .what are set up need to be done in wireshark? please help.

Regards, Sanath Rai