#39 IGMP multicast support for STM32

[Woodrow Douglass]

Attached is a patch against 2.6.6 that enables multicast on stm32 targets. It requires MAC_ENABLE_MULTICAST to be set to TRUE in halconf.h; i've also added a default value of FALSE for that symbol because of extra CPU usage required.

[Giovanni Di Sirio]

Hi,

Thanks for the patch. A feature like this could eventually go in the 3.0 branch, 2.6.x is closed for new features.
The only problem I can see with the patch is exposing the feature from the high level driver, while this is not guaranteed to be present on different devices. I would make it a low level setting in mcuconf.h and then export a capability key MAC_SUPPORTS_MULTICAST to the higher levels.

Giovanni

[Woodrow Douglass]

Thanks for the reply. If i make any more patches, i'll be sure to port and test against 3.0 before submission. Also, I can see why you'd want to expose the feature from the lld instead of the high level abstraction, it does make things cleaner.