meshtastic: set SO_REUSEADDR on UDP socket to fix multicast delivery#8
Merged
aanon4 merged 1 commit intokn6plv:mainfrom Apr 1, 2026
Merged
Conversation
aanon4
reviewed
Mar 31, 2026
meshtastic.uc
Outdated
| s.bind({ | ||
| port: PORT | ||
| }); | ||
| s.setopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1); |
Contributor
There was a problem hiding this comment.
Shouldn't this be before the bind?
Contributor
Author
There was a problem hiding this comment.
Oof, yep, fixed in rebase
Localhost multicast sockets require SO_REUSEADDR so that multiple processes can bind to the same (address, port) pair and both receive multicast traffic. Without it, the kernel does not deliver multicast packets to all bound sockets
USA-RedDragon
force-pushed
the
localhost-multicast-fix
branch
from
92c0f59 to
b2c4ee4
Compare
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Localhost multicast sockets require SO_REUSEADDR so that multiple processes can bind to the same (address, port) pair and both receive multicast traffic. Without it, the kernel does not deliver multicast packets to all bound sockets.
Needed to work on a service that can run on AREDN nodes bridging any USB-connected serial meshtastic device to Raven (or any meshtastic over LAN clients) over localhost. Still testing https://github.com/USA-RedDragon/meshtastic-serial-udp