change the return type of TSCH_CALLBACK_PACKET_READY
@@ -140,7 +140,7 @@ void TSCH_CALLBACK_NEW_TIME_SOURCE(const struct tsch_neighbor *old, const struct
/* Called by TSCH every time a packet is ready to be added to the send queue */
#ifdef TSCH_CALLBACK_PACKET_READY
-void TSCH_CALLBACK_PACKET_READY(void);
+int TSCH_CALLBACK_PACKET_READY(void);
#endif
/***** External Variables *****/
