burst_timeslot_filter: implement and expose GET/SET API
diff --git a/lib/flow_control/burst_timeslot_filter_impl.h b/lib/flow_control/burst_timeslot_filter_impl.h
index f7b0b2d..130047e 100644
--- a/lib/flow_control/burst_timeslot_filter_impl.h
+++ b/lib/flow_control/burst_timeslot_filter_impl.h
@@ -36,6 +36,10 @@
       burst_timeslot_filter_impl(unsigned int timeslot);
       ~burst_timeslot_filter_impl();
       void process_burst(pmt::pmt_t msg);
+
+      /* External API */
+      unsigned int get_tn(void);
+      unsigned int set_tn(unsigned int tn);
     };
 
   } // namespace gsm