Fixed mac_pd_sap CCA_PREPARE active ACK handler.

Change-Id: Ib423726b704b7ade4685e18c4941dd0e26a4131c

test/nanostack/unittest/mac/mac_pd_sap/test_mac_pd_sap.c

@@ -29,6 +29,7 @@
 #include "test_mac_pd_sap.h"
 #include "mac_header_helper_functions_stub.h"
 #include "mac_mcps_sap_stub.h"
+#include "mac_security_mib_stub.h"
 #include "nsdynmemLIB_stub.h"
 #include "fhss_config_stub.h"
 #include "sw_mac_stub.h"
@@ -817,11 +818,32 @@ bool test_mac_cca_prepare_cb()
     phy_message.message.mac15_4_pd_sap_confirm.status = PHY_LINK_CCA_PREPARE;
 
     int8_t ret = mac_pd_sap_data_cb(&rf_ptr, &phy_message);
+    if (ret != -1) {
+        return false;
+    }
+
+    rf_ptr.ack_tx_possible = true;
+    ret = mac_pd_sap_data_cb(&rf_ptr, &phy_message);
     if (ret != 0) {
         return false;
     }
 
-    rf_ptr.mac_ack_tx_active = false;
+    rf_ptr.ack_tx_possible = false;
+
+    rf_ptr.enhanced_ack_handler_timestamp = 10;
+    mlme_device_descriptor_t test_neigh;
+    mac_security_mib_stub.device_ptr = &test_neigh;
+
+    ret = mac_pd_sap_data_cb(&rf_ptr, &phy_message);
+    if (ret != 0) {
+        return false;
+    }
+    mac_security_mib_stub.device_ptr = NULL;
+
+    ret = mac_pd_sap_data_cb(&rf_ptr, &phy_message);
+    if (ret != -1 || rf_ptr.mac_ack_tx_active) {
+        return false;
+    }
 
     ret = mac_pd_sap_data_cb(&rf_ptr, &phy_message);
     if (ret != -1) {