FlexRAN agent app: Add sample FlexRAN app

cmake_targets/CMakeLists.txt

@@ -1099,6 +1099,13 @@ add_library(FLEXRAN_AGENT
   )
 add_dependencies(FLEXRAN_AGENT rrc_flag)
 set(FLEXRAN_AGENT_LIB FLEXRAN_AGENT)
+add_library(flapp_sample SHARED
+  ${OPENAIR2_DIR}/ENB_APP/flexran_apps/sample.c
+)
+set_target_properties(flapp_sample PROPERTIES C_VISIBILITY_PRESET hidden)
+add_custom_target(flapp_all DEPENDS
+  flapp_sample
+)
 #include_directories(${OPENAIR2_DIR}/ENB_APP)
 
 set(PROTOBUF_LIB "protobuf-c")

openair2/ENB_APP/flexran_apps/sample.c

@@ -0,0 +1,121 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+/*! \file sample.c
+ * \brief flexran sample app
+ * \author Robert Schmidt
+ * \date 2020
+ * \version 0.1
+ */
+
+#include "flexran_agent_common.h"
+#include "flexran_agent_async.h"
+#include "flexran_agent_extern.h"
+#include "flexran_agent_timer.h"
+#include "flexran_agent_defs.h"
+#include "flexran_agent_net_comm.h"
+#include "flexran_agent_ran_api.h"
+#include "flexran_agent_phy.h"
+#include "flexran_agent_mac.h"
+#include "flexran_agent_rrc.h"
+#include "flexran_agent_pdcp.h"
+#include "flexran_agent_s1ap.h"
+#include "flexran_agent_app.h"
+#include "common/utils/LOG/log.h"
+#include "assertions.h"
+
+/* callback to be called for event: shows exemplary variable use and use of RAN
+ * API */
+int tick;
+Protocol__FlexranMessage *sample_tick(
+    mid_t mod_id,
+    const Protocol__FlexranMessage *msg) {
+  tick++;
+  const int num = flexran_get_mac_num_ues(mod_id);
+  LOG_I(FLEXRAN_AGENT, "%s(): tick %d number UEs %d\n", __func__, tick, num);
+  return NULL;
+}
+
+void print_param(Protocol__FlexAgentReconfigurationSubsystem__ParamsEntry **p, int n_p) {
+  LOG_I(FLEXRAN_AGENT, "%s(): received %d parameters\n", __func__, n_p);
+  for (int i = 0; i < n_p; ++i) {
+    switch (p[i]->value->param_case) {
+      case PROTOCOL__FLEX_AGENT_RECONFIGURATION_PARAM__PARAM__NOT_SET:
+        LOG_I(FLEXRAN_AGENT, "    param %s is not set\n", p[i]->key);
+        break;
+      case PROTOCOL__FLEX_AGENT_RECONFIGURATION_PARAM__PARAM_INTEGER:
+        LOG_I(FLEXRAN_AGENT, "    param %s is %d\n", p[i]->key, p[i]->value->integer);
+        break;
+      case PROTOCOL__FLEX_AGENT_RECONFIGURATION_PARAM__PARAM_FLOATING:
+        LOG_I(FLEXRAN_AGENT, "    param %s is %f\n", p[i]->key, p[i]->value->floating);
+        break;
+      case PROTOCOL__FLEX_AGENT_RECONFIGURATION_PARAM__PARAM_BOOLEAN:
+        LOG_I(FLEXRAN_AGENT, "    param %s is %s\n", p[i]->key, p[i]->value->boolean ? "true" : "false");
+        break;
+      case PROTOCOL__FLEX_AGENT_RECONFIGURATION_PARAM__PARAM_STR:
+        LOG_I(FLEXRAN_AGENT, "    param %s is %s\n", p[i]->key, p[i]->value->str);
+        break;
+      default:
+        LOG_W(FLEXRAN_AGENT, "    type of param %s is unknown\n", p[i]->key);
+        break;
+    };
+  }
+}
+
+/* sa_start: entry point for sample app. Installs a callback using the timer
+ * API to have function sample_tick() called every 5s */
+#define TIMER 22
+int sa_start(mid_t mod_id,
+             Protocol__FlexAgentReconfigurationSubsystem__ParamsEntry **p,
+             int n_p) {
+  LOG_W(FLEXRAN_AGENT, "%s(): enable sample app timer\n", __func__);
+  flexran_agent_create_timer(mod_id,
+                             5000,
+                             FLEXRAN_AGENT_TIMER_TYPE_PERIODIC,
+                             TIMER,
+                             sample_tick,
+                             NULL);
+  print_param(p, n_p);
+  return 0;
+}
+
+int sa_reconfig(mid_t mod_id,
+                Protocol__FlexAgentReconfigurationSubsystem__ParamsEntry **p,
+                int n_p)
+{
+  print_param(p, n_p);
+  return 0;
+}
+
+/* stop function: cleans up before app can be unloaded. Here: stop the timer */
+int sa_stop(mid_t mod_id) {
+  LOG_W(FLEXRAN_AGENT, "%s(): disable sample app timer\n", __func__);
+  flexran_agent_destroy_timer(mod_id, TIMER);
+  return 0;
+}
+
+/* app definition. visibility should be set to default so this symbol is
+ * reachable from outside */
+flexran_agent_app_t __attribute__ ((visibility ("default"))) app = {
+  .start = sa_start,
+  .reconfig = sa_reconfig,
+  .stop =  sa_stop
+};