Fix Silabs HAL: also send commands to group bindings (#437)

Author: eakorolev

docs/changelog_fw.md

@@ -51,6 +51,7 @@ Please describe what you are working on, under ## Upcoming
   - Changing device type breaks Silabs NVM data
   - Reset needed 11 presses instead of 10
   - ZHA quirk silently failed to apply on relay-less devices with LED indicators (scene remotes), leaving firmware attributes unreachable from the UI
+  - Silabs: bindings to Zigbee groups ignored when emitting commands
 - **New**
   - SONOFF ZBMINIL2 version updates broken?
 

src/silabs/hal/zigbee.c

@@ -305,8 +305,11 @@ hal_zigbee_status_t hal_zigbee_send_cmd_to_bindings(const hal_zigbee_cmd *cmd) {
     fill_cmd(cmd);
 
     sl_zigbee_af_set_command_endpoints(cmd->endpoint, cmd->endpoint);
-    sl_status_t st = sl_zigbee_af_send_command_unicast_to_bindings();
-    return (st == SL_STATUS_OK) ? HAL_ZIGBEE_OK : HAL_ZIGBEE_ERR_SEND_FAILED;
+    sl_status_t st_unicast   = sl_zigbee_af_send_command_unicast_to_bindings();
+    sl_status_t st_multicast = sl_zigbee_af_send_command_multicast_to_bindings();
+
+    return (st_unicast == SL_STATUS_OK || st_multicast == SL_STATUS_OK)
+           ? HAL_ZIGBEE_OK : HAL_ZIGBEE_ERR_SEND_FAILED;
 }
 
 hal_zigbee_status_t