pbio/sys/status: Temporarily maintain Contiki broadcast on status change.

We have already updated the parts that handle status change events, but there are still some processes that await status changes by asynchronously polling.

This change ensures we keep doing that until all processes have been converted to the new pattern.

Author: laurensvalk

lib/pbio/sys/status.c

@@ -9,6 +9,8 @@
 
 #include <contiki.h>
 
+#include <pbio/os.h>
+
 #include <pbdrv/clock.h>
 #include <pbsys/status.h>
 
@@ -38,6 +40,14 @@ static void pbsys_status_update_flag(pbio_pybricks_status_t status, bool set) {
     // directly. All other processes just poll the status as needed. If we ever
     // need more subscribers, we could register callbacks and call them here.
     pbsys_hmi_handle_status_change(set ? PBSYS_STATUS_CHANGE_SET : PBSYS_STATUS_CHANGE_CLEARED, status);
+
+    // Other processes may be awaiting status changes, so poll.
+    pbio_os_request_poll();
+
+    // REVISIT: Can be deleted once all processes that poll the status are
+    // updated to use the new pbio os event loop.
+    process_post(PROCESS_BROADCAST, PROCESS_EVENT_COM, NULL);
+
 }
 
 /**