RTL8735B (AmebaPro2) WiFi STA drops incoming multicast after WLAN update — worked before

FreeRTOS WiFi
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1

Hi,

Our app runs a standard UDP multicast listener (ONVIF WS-Discovery, 239.255.255.250:3702). Over WiFi STA, multicast packets never reach it — no matter what, even with a confirmed successful IP_ADD_MEMBERSHIP join. Send the exact same packet as unicast to the device’s own IP/port instead, and it responds instantly and correctly.

That isolates it cleanly: the socket, the join, and the app logic are all fine — this is the WiFi driver not delivering multicast-addressed frames up to the stack anymore.

Is there any known change in STA-mode multicast RX filtering in a recent WLAN component release?Or any driver-level way to force multicast acceptance in STA mode?

Thank you,

Yugandhar

2

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3

Hi @yugandhar ,

Could you provide an example code for us to replicate your issue?

Thank you.