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diff --git a/src/du_app/du_tmr.c b/src/du_app/du_tmr.c
new file mode 100644
index 000000000..d63583618
--- /dev/null
+++ b/src/du_app/du_tmr.c
@@ -0,0 +1,175 @@
+/*******************************************************************************
+################################################################################
+#   Copyright (c) [2017-2019] [Radisys]                                        #
+#                                                                              #
+#   Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0                             #
+#                                                                              #
+#   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.                                             #
+################################################################################
+*******************************************************************************/
+
+#include "common_def.h"
+#include "lkw.h"
+#include "lkw.x"
+#include "lrg.h"
+#include "lrg.x"
+#include "du_tmr.h"
+#include "du_app_rlc_inf.h"
+#include "du_app_mac_inf.h"
+#include "du_cfg.h"
+#include "du_e2ap_mgr.h"
+#include "du_mgr.h"
+#include "du_e2ap_msg_hdl.h"
+
+/**
+ * @brief Handler to check if the timer is running
+ *
+ * @param[in] cb        Control block depending on the type of the timer event.
+ *                      It can be uplink/downlink rbCb or rgu sap control block
+ * @param[in] tmrEvnt   Timer event to be started
+ *
+ * @return  Bool indicating whether the timer is running or not
+ *      -# ROK
+ *      -# RFAILED
+*/
+
+bool duChkTmr(PTR cb, int16_t tmrEvnt)
+{
+   switch (tmrEvnt)
+   {
+      case EVENT_E2_SETUP_TMR:
+      {
+         if(((E2apDb *)cb)->e2Timers.e2SetupTimer.tmrEvnt == EVENT_E2_SETUP_TMR)
+         {
+             DU_LOG("\nERROR  -->  DU_APP : duChkTmr: Invalid tmr Evnt [%d]", tmrEvnt);
+             return TRUE;
+         }
+      }
+      
+      default:
+      {
+         DU_LOG("\nERROR  -->  DU_APP : duChkTmr: Invalid tmr Evnt [%d]", tmrEvnt);
+      }
+   }
+
+   return FALSE;
+}
+
+/**
+ * @brief Handler to start timer
+ *
+ * @param[in] cb        Control block depending on the type of the timer event.
+ *                      It can be uplink/downlink rbCb or rgu sap control block
+ * @param[in] tmrEvnt   Timer event to be started
+ *
+ * @return  Void
+*/
+
+void duStartTmr(PTR cb, int16_t tmrEvnt, uint8_t timerValue)
+{
+   E2apDb *e2apDb;
+   CmTmrArg arg;
+   arg.wait = 0;
+   
+   switch (tmrEvnt)
+   {
+      case EVENT_E2_SETUP_TMR:
+      {
+         e2apDb = ((E2apDb *)cb);
+         DU_TMR_CALCUATE_WAIT(arg.wait, timerValue, duCb.duTimersInfo.tmrRes);
+
+         arg.timers = &e2apDb->e2Timers.e2SetupTimer;
+         arg.max = MAX_E2_SETUP_TMR;
+         break;
+      }
+      default:
+      {
+         DU_LOG("\nERROR  -->  DU : duStartTmr: Invalid tmr Evnt [%d]", tmrEvnt);
+      }
+   }
+
+   if(arg.wait != 0)
+   {
+      arg.tqCp   = &(duCb.duTimersInfo.tmrTqCp);
+      arg.tq     = duCb.duTimersInfo.tmrTq;
+      arg.cb     = cb;
+      arg.evnt   = tmrEvnt;
+      arg.tNum   = 0;
+
+      cmPlcCbTq(&arg);
+   }
+   return;
+}
+
+/**
+ * @brief Handler to invoke events on expiry of timer.
+ *
+ * @details
+ *    This function is used to handle expiry of timer,it invokes relevant
+ *    functions.
+ *
+ * @param[in] cb        Control block depending on the type of the timer event.
+ *                      It can be uplink/downlink rbCb or rgu sap control block
+ * @param[in] tmrEvnt   Timer event to be started
+ *
+ * @return  Void
+*/
+
+void duTmrExpiry(PTR cb,int16_t tmrEvnt)
+{
+   switch (tmrEvnt)
+   {
+      case EVENT_E2_SETUP_TMR:
+      {
+         BuildAndSendE2SetupReq();
+         break;
+      }
+      default:
+      {
+         DU_LOG("\nERROR  -->  DU : duStartTmr: Invalid tmr Evnt [%d]", tmrEvnt);
+         break;
+      }
+   }
+
+   return;
+}
+
+/**
+ * @brief DU instance timer call back function registered with system services.
+ *
+ * @details
+ *
+ *     Function :  duActvTmr
+ *
+ *     This function is invoked for every timer activation
+ *     period expiry. Note that SS_MT_TMR flag needs to be enabled for this
+ *     as isntId is needed.As part of SRegTmr call for du instance
+ *     SS_MT_TMR flag needs to be enabled and duActvTmr needs to be given as
+ *     callback function
+ *
+ *  @return  short int
+ *      -# ROK
+ **/
+
+short int duActvTmr(Ent ent,Inst inst)
+{
+   /* Check if any timer in the du instance has expired */
+   cmPrcTmr(&(duCb.duTimersInfo.tmrTqCp), duCb.duTimersInfo.tmrTq, (PFV) duTmrExpiry);
+
+   return ROK;
+
+} /* end of duActvTmr */
+
+/**********************************************************************
+
+         End of file
+**********************************************************************/
+