Fix Silabs HAL: also send commands to group bindings

[eakorolev]

Discovered on Moes ZT-B-EU2 (TS0042) that buttons bound to a Zigbee group emit nothing on press, while unicast bindings work fine.

Turns out hal_zigbee_send_cmd_to_bindings() only calls sl_zigbee_af_send_command_unicast_to_bindings() — group entries have binding.type == SL_ZIGBEE_MULTICAST_BINDING and get filtered out by the unicast walk. The SiLabs framework itself handles this by calling both _unicast_to_bindings() and _multicast_to_bindings() back-to-back after a single fill_external_buffer (see reporting.c:367-381) — mirrored here.

[eakorolev]

@romasku @andrei-lazarov should I update firmware version right now, or CI will do it after merge?

[andrei-lazarov]

This looks like a big omission, how hasn't anyone reported yet? 😯 Thanks for fixing

Not sure what to do while romasku is inactive.. I don't want to update source code and release without him

Also I've removed the image metadata (location) for your privacy...
(GitHub uploads in original -> you should do some compression before-hand)

[eakorolev]

I'm just playing around with a few devices and trying to make my smart home work exactly the way I want. Native Zigbee bindings are always better than integrations through HA, so I'm using them everywhere it's possible =)

A big update with support for a separate long-press endpoint is almost here, but one of my (battery) devices suddenly dropped off the network, so I'm doing some field testing before publishing the PR.

Thanks for the metadata, I wasn't worried about it.

[ohmstance]

Hey I built your PR and binding to group works now. Thank you!

[romasku]

Great catch, thank you!