Prevent the PNF from sending P7 messages after sending a STOP.indication

Upon stopping the PNF, when sending the STOP.indication to the VNF, set pnf_p7->terminate to 1.

Add a check on the PNF P7 send functions to not send a message after pnf_p7->terminate is set

nfapi/oai_integration/nfapi_pnf.c

@@ -1801,6 +1801,9 @@ int nr_stop_request(nfapi_pnf_config_t *config, nfapi_pnf_phy_config_t *phy, nfa
                                          .header.phy_id = req->header.phy_id};
   nfapi_nr_stop_indication(config, &resp);
   has_sent_stop_ind = true;
+  // Upon sending the STOP.indication mark P7 PNF to terminate, to not send any further messages to the VNF
+  pnf_p7_t *pnf_p7 = (pnf_p7_t *)(p7_config_g);
+  pnf_p7->terminate = 1;
 #ifdef ENABLE_WLS
   wls_pnf_close(pnf_p5_init_and_receive_pthread);
 #endif

nfapi/oai_integration/socket/socket_pnf.c

@@ -78,6 +78,10 @@ static int send_p7_msg(pnf_p7_t *pnf_p7, uint8_t *msg, uint32_t len)
 
 bool pnf_nr_send_p7_message(pnf_p7_t *pnf_p7, nfapi_nr_p7_message_header_t *header, uint32_t msg_len)
 {
+  if (pnf_p7->terminate) {
+    //don't send any further P7 messages after terminating
+    return false;
+  }
   header->m_segment_sequence = NFAPI_NR_P7_SET_MSS(0, 0, pnf_p7->sequence_number);
 
   // Need to guard against different threads calling the encode function at the same time

nfapi/oai_integration/wls_integration/wls_pnf.c

@@ -201,7 +201,10 @@ bool wls_pnf_nr_send_p5_message(pnf_t *pnf, nfapi_nr_p4_p5_message_header_t *msg
 bool wls_pnf_nr_send_p7_message(pnf_p7_t *pnf_p7, nfapi_nr_p7_message_header_t *msg, uint32_t msg_len)
 {
   UNUSED_VARIABLE(msg_len);
-
+  if (pnf_p7->terminate) {
+    // don't send any further P7 messages after terminating
+    return false;
+  }
   if (!isFAPIMessageIDValid(msg->message_id)) {
     return false;
   }