Multicast and Unicast server on same port

Question

Multicast and Unicast server on same port

HRogge opened this issue 3 years ago · comments

Henning Rogge commented 3 years ago

Is it possible for a server using this library to receive both unicast and multicast messages on the same UDP port?

Jozef Kralik · Answer 1 · Mon Jan 03 2022 23:10:35 GMT+0800 (China Standard Time)

Hi. The multicast messages support only the server and yes you can use the same port. Pls look to example:

create listen port:
https://github.com/plgd-dev/go-coap/blob/master/examples/mcast/client/main.go#L66
create the server
https://github.com/plgd-dev/go-coap/blob/master/examples/mcast/client/main.go#L80

Henning Rogge · Answer 2 · Tue Jan 04 2022 15:43:20 GMT+0800 (China Standard Time)

Thank you for the quick answer, it made me notice that I got drawn to the old (v1?) codebase by an example on pkg.go.dev. I will now look at the new codebase...

Henning Rogge · Answer 3 · Tue Jan 04 2022 17:13:38 GMT+0800 (China Standard Time)

Is there also an example for sending a multicast message (udp message, non-confirmable, Option NoResponse-2) instead of a Discovery?
Edit: resolved the problem by using WriteMessage() and turning of the blockwise transfer of the coap session. I think I run into a bug: #272

Henning Rogge · Answer 4 · Mon Jan 17 2022 22:31:54 GMT+0800 (China Standard Time)

solved by #291 and some explanations.
thank you for merging the code that quickly