Starting to release GTP-U tunnels when UE disconnects.

srsepc/src/mme/s1ap.cc

@@ -968,6 +968,9 @@ s1ap::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQU
   }
   ue_set->second.erase(mme_ue_s1ap_id);
 
+  //Delete any context at the SPGW
+  m_spgw->delete_session_request(ue_ctx->imsi);
+
   //Delete UE context
   delete ue_ctx->second;
   m_active_ues.erase(ue_ctx);

srsepc/src/spgw/spgw.cc

@@ -471,6 +471,12 @@ spgw::handle_create_session_request(struct srslte::gtpc_create_session_request *
   return;
 }
 
+void
+spgw::delete_session_request(uint64_t imsi)
+{
+
+}
+
 void
 spgw::handle_modify_bearer_request(struct srslte::gtpc_pdu *mb_req_pdu, struct srslte::gtpc_pdu *mb_resp_pdu)
 {