diff --git a/sim/core.cc b/sim/core.cc
new file mode 100644
index 0000000..ce3d1fa
--- /dev/null
+++ b/sim/core.cc
@@ -0,0 +1,130 @@
+/*
+    Copyright (C) 2018 Open Networking Foundation
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <iostream>
+#include <memory>
+#include <string>
+#include <unistd.h>
+
+#include "Queue.h"
+#include <iostream>
+#include <sstream>
+
+#include "core.h"
+#include "state.h"
+
+State state;
+
+void* RunSim(void *) {
+    while (!state.is_connected()) {
+        sleep(5);
+    }
+
+    // Send Olt up indication
+    {
+        openolt::Indication ind;
+        openolt::OltIndication* olt_ind = new openolt::OltIndication;
+        olt_ind->set_oper_state("up");
+        ind.set_allocated_olt_ind(olt_ind);
+        std::cout << "olt indication, oper_state:" << ind.olt_ind().oper_state() << std::endl;
+        oltIndQ.push(ind);
+    }
+
+    // TODO - Add interface and onu indication events
+}
+
+Status Enable_(int argc, char *argv[]) {
+    pthread_t simThread;
+
+    pthread_create(&simThread, NULL, RunSim, NULL);
+    return Status::OK;
+}
+
+Status Disable_() {
+    return Status::OK;
+}
+
+Status Reenable_() {
+    return Status::OK;
+}
+
+Status EnablePonIf_(uint32_t intf_id) {
+    return Status::OK;
+}
+
+Status DisableUplinkIf_(uint32_t intf_id) {
+    return Status::OK;
+}
+
+Status EnableUplinkIf_(uint32_t intf_id) {
+    return Status::OK;
+}
+
+Status DisablePonIf_(uint32_t intf_id) {
+    return Status::OK;
+}
+
+Status ActivateOnu_(uint32_t intf_id, uint32_t onu_id,
+    const char *vendor_id, const char *vendor_specific, uint32_t pir) {
+    return Status::OK;
+}
+
+Status DeactivateOnu_(uint32_t intf_id, uint32_t onu_id,
+    const char *vendor_id, const char *vendor_specific) {
+    return Status::OK;
+}
+
+Status DeleteOnu_(uint32_t intf_id, uint32_t onu_id,
+    const char *vendor_id, const char *vendor_specific) {
+    return Status::OK;;
+}
+
+Status OmciMsgOut_(uint32_t intf_id, uint32_t onu_id, const std::string pkt) {
+    return Status::OK;
+}
+
+Status OnuPacketOut_(uint32_t intf_id, uint32_t onu_id, const std::string pkt) {
+    return Status::OK;
+}
+
+Status UplinkPacketOut_(uint32_t intf_id, const std::string pkt) {
+    return Status::OK;
+}
+
+Status FlowAdd_(uint32_t onu_id,
+                uint32_t flow_id, const std::string flow_type,
+                uint32_t access_intf_id, uint32_t network_intf_id,
+                uint32_t gemport_id, uint32_t priority_value,
+                const ::openolt::Classifier& classifier,
+                const ::openolt::Action& action) {
+    return Status::OK;
+}
+
+Status SchedAdd_(int intf_id, int onu_id, int agg_port_id) {
+    return Status::OK;
+}
+
+Status SchedRemove_(int intf_id, int onu_id, int agg_port_id) {
+    return Status::OK;
+}
+
+Status FlowRemove_(uint32_t flow_id, const std::string flow_type) {
+    return Status::OK;
+}
+
+void* stats_collection() {
+}