rp2040/rp2350: Support multicast TTL socket option - #11174
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Signed-off-by: Daniil Mordanov <mordanovdania@gmail.com>
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@todbot want to test this? The issue from jepler says it is needed for your MicroOSC. |
Yep, verified this change lets MicroOSC receive & send Multicast UDP OSC messages on RP2040 Pico W. Thanks! |
Daniiiil1
marked this pull request as ready for review
August 6, 2026 15:20
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Closes #9938.
The Raspberry Pi port uses lwIP's raw API rather than its socket API, so it cannot delegate this option to
lwip_setsockopt()as the Espressif port does. HandleIPPROTO_IP/IP_MULTICAST_TTLfor UDP sockets by updating the UDP PCB's multicast TTL directly.The implementation also:
EOPNOTSUPPfor non-datagram sockets;EINVALfor a closed UDP PCB or an empty option value;IP_MULTICAST_TTLrepresentation.Testing:
pre-commit run --files ports/raspberrypi/common-hal/socketpool/Socket.cgmake -C ports/raspberrypi BOARD=raspberry_pi_pico_w -j4gmake -C ports/raspberrypi BOARD=raspberry_pi_pico2_w -j4udp_pcb.mcast_ttlBoth builds produced
firmware.uf2. I do not have a Pico W/Pico 2 W connected, so I have not performed an on-device multicast packet capture.