Trig a new back off period for pending TX if ACK tx is active

Change-Id: Ida77974436f77edb60f7a91146a017a14554f167

Author: Juha Heiskanen

source/MAC/IEEE802_15_4/mac_pd_sap.c

@@ -290,15 +290,22 @@ void mac_pd_sap_state_machine(protocol_interface_rf_mac_setup_s *rf_mac_setup)
 
 static void  mac_sap_cca_fail_cb(protocol_interface_rf_mac_setup_s *rf_ptr)
 {
-    rf_ptr->macRfRadioTxActive = false;
-    if (rf_ptr->mac_cca_retry > rf_ptr->macMaxCSMABackoffs || (rf_ptr->active_pd_data_request && rf_ptr->active_pd_data_request->asynch_request)) {
-        //Send MAC_CCA_FAIL
-        mac_tx_done_state_set(rf_ptr, MAC_CCA_FAIL);
+    if (rf_ptr->mac_ack_tx_active) {
+        if (rf_ptr->active_pd_data_request) {
+            mac_csma_backoff_start(rf_ptr);
+        }
     } else {
-        timer_mac_stop(rf_ptr);
-        mac_csma_BE_update(rf_ptr);
-        if (mcps_pd_data_rebuild(rf_ptr, rf_ptr->active_pd_data_request) ) {
+
+        rf_ptr->macRfRadioTxActive = false;
+        if (rf_ptr->mac_cca_retry > rf_ptr->macMaxCSMABackoffs || (rf_ptr->active_pd_data_request && rf_ptr->active_pd_data_request->asynch_request)) {
+            //Send MAC_CCA_FAIL
             mac_tx_done_state_set(rf_ptr, MAC_CCA_FAIL);
+        } else {
+            timer_mac_stop(rf_ptr);
+            mac_csma_BE_update(rf_ptr);
+            if (mcps_pd_data_rebuild(rf_ptr, rf_ptr->active_pd_data_request) ) {
+                mac_tx_done_state_set(rf_ptr, MAC_CCA_FAIL);
+            }
         }
     }
 }