Bug fix for IP Endpoint to work with NRF

etc/smf.conf

@@ -80,9 +80,6 @@ SMF =
     DEFAULT_DNS_IPV6_ADDRESS     = "2001:4860:4860::8888";            # YOUR DNS CONFIG HERE
     DEFAULT_DNS_SEC_IPV6_ADDRESS = "2001:4860:4860::8844";            # YOUR DNS CONFIG HERE
  
-    # Non standard feature, normally should be set to "no", but you may need to set to yes for UE that do not explicitly request a PDN address through NAS signalling
-    FORCE_PUSH_PROTOCOL_CONFIGURATION_OPTIONS = "no";  # STRING, {"yes", "no"}.
-
     SUPPORT_FEATURES: 
     {
       # STRING, {"yes", "no"}, 

src/common/smf.h

@@ -248,16 +248,14 @@ typedef struct nf_service_version_s {
 } nf_service_version_t;
 
 typedef struct ip_endpoint_s {
-  std::vector<struct in_addr> ipv4_addresses;
-  // std::vector<struct in6_addr> ipv6_addresses;
+  //struct in6_addr  ipv6_address;
+  struct in_addr ipv4_address;
   std::string transport;  // TCP
   unsigned int port;
   std::string to_string() const {
     std::string s = {};
-    s.append("Ipv4 Addresses: ");
-    for (auto ipv4 : ipv4_addresses) {
-      s.append(inet_ntoa(ipv4));
-    }
+    s.append("Ipv4 Address: ");
+    s.append(inet_ntoa(ipv4_address));
     s.append(", TransportProtocol: ");
     s.append(transport);
     s.append(", Port: ");

src/smf_app/smf_app.cpp

@@ -343,11 +343,12 @@ smf_app::smf_app(const std::string& config_file)
     start_upf_association(*it);
   }
 
-  // Register to NRF
+  // Register to NRF (if this option is enabled)
   if (smf_cfg.register_nrf) register_to_nrf();
 
   if (smf_cfg.discover_upf) {
-    // Trigger NFStatusNotify
+    // Trigger NFStatusNotify subscription to be noticed when a new UPF becomes
+    // available (if this option is enabled)
     unsigned int microsecond = 10000;  // 10ms
     usleep(microsecond);
     trigger_upf_status_notification_subscribe();
@@ -1863,9 +1864,7 @@ void smf_app::generate_smf_profile() {
   ip_endpoint_t endpoint = {};
   std::vector<struct in_addr> addrs;
   nf_instance_profile.get_nf_ipv4_addresses(addrs);
-  for (auto a : addrs) {
-    endpoint.ipv4_addresses.push_back(a);
-  }
+  endpoint.ipv4_address =  addrs[0]; //TODO: use first IP ADDR for now
   endpoint.transport = "TCP";
   endpoint.port      = smf_cfg.sbi.port;
   nf_service.ip_endpoints.push_back(endpoint);
@@ -1912,9 +1911,9 @@ void smf_app::generate_smf_profile() {
 
 //---------------------------------------------------------------------------------------------
 void smf_app::register_to_nrf() {
-  // create a NF profile to this instance
+  // Create a NF profile to this instance
   generate_smf_profile();
-  // send request to N11 to send NF registration to NRF
+  // Send request to N11 to send NF registration to NRF
   trigger_nf_registration_request();
 }
 

src/smf_app/smf_profile.cpp

@@ -371,10 +371,7 @@ void smf_profile::to_json(nlohmann::json& data) const {
     srv_tmp["ipEndPoints"] = nlohmann::json::array();
     for (auto endpoint : service.ip_endpoints) {
       nlohmann::json ep_tmp = {};
-      ep_tmp["ipv4Address"] = nlohmann::json::array();
-      for (auto address : endpoint.ipv4_addresses) {
-        ep_tmp["ipv4Address"].push_back(inet_ntoa(address));
-      }
+      ep_tmp["ipv4Address"] = inet_ntoa(endpoint.ipv4_address);
       ep_tmp["transport"] = endpoint.transport;
       ep_tmp["port"]      = endpoint.port;
       srv_tmp["ipEndPoints"].push_back(ep_tmp);