diff --git a/src/core.cc b/src/core.cc
new file mode 100644
index 0000000..81444f1
--- /dev/null
+++ b/src/core.cc
@@ -0,0 +1,427 @@
+/*
+    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 "Queue.h"
+#include <iostream>
+#include <sstream>
+
+#include "core.h"
+#include "indications.h"
+
+extern "C"
+{
+#include <bcmos_system.h>
+#include <bal_api.h>
+#include <bal_api_end.h>
+}
+
+Status Enable_() {
+    static bool enabled = false;
+    bcmbal_access_terminal_cfg acc_term_obj;
+    bcmbal_access_terminal_key key = { };
+
+    if (!enabled) {
+        std::cout << "Enable OLT" << std::endl;
+        key.access_term_id = DEFAULT_ATERM_ID;
+        BCMBAL_CFG_INIT(&acc_term_obj, access_terminal, key);
+        BCMBAL_CFG_PROP_SET(&acc_term_obj, access_terminal, admin_state, BCMBAL_STATE_UP);
+        if (bcmbal_cfg_set(DEFAULT_ATERM_ID, &(acc_term_obj.hdr))) {
+            std::cout << "ERROR: Failed to enable OLT" << std::endl;
+            return Status(grpc::StatusCode::INTERNAL, "Failed to enable OLT");
+        }
+        enabled = true;
+    }
+    return Status::OK;
+}
+
+Status EnablePonIf_(uint32_t intf_id) {
+    bcmbal_interface_cfg interface_obj;
+    bcmbal_interface_key interface_key;
+
+    interface_key.intf_id = intf_id;
+    interface_key.intf_type = BCMBAL_INTF_TYPE_PON;
+
+    BCMBAL_CFG_INIT(&interface_obj, interface, interface_key);
+    BCMBAL_CFG_PROP_SET(&interface_obj, interface, admin_state, BCMBAL_STATE_UP);
+
+    if (bcmbal_cfg_set(DEFAULT_ATERM_ID, &(interface_obj.hdr))) {
+        std::cout << "ERROR: Failed to enable PON interface: " << intf_id << std::endl;
+        return Status(grpc::StatusCode::INTERNAL, "Failed to enable PON interface");
+    }
+
+    return Status::OK;
+}
+
+Status ActivateOnu_(uint32_t intf_id, uint32_t onu_id,
+    const char *vendor_id, const char *vendor_specific) {
+
+    bcmbal_subscriber_terminal_cfg sub_term_obj = {};
+    bcmbal_subscriber_terminal_key subs_terminal_key;
+    bcmbal_serial_number serial_num = {};
+    bcmbal_registration_id registration_id = {};
+
+    std::cout << "Enabling ONU " << onu_id << " on PON " << intf_id << std::endl;
+    std::cout << "Vendor Id " << vendor_id
+              << "Vendor Specific Id " << vendor_specific
+              << std::endl;
+
+    subs_terminal_key.sub_term_id = onu_id;
+    subs_terminal_key.intf_id = intf_id;
+    BCMBAL_CFG_INIT(&sub_term_obj, subscriber_terminal, subs_terminal_key);
+
+    memcpy(serial_num.vendor_id, vendor_id, 4);
+    memcpy(serial_num.vendor_specific, vendor_specific, 4);
+    BCMBAL_CFG_PROP_SET(&sub_term_obj, subscriber_terminal, serial_number, serial_num);
+
+    // FIXME - Use a default (all zeros) registration id.
+    memset(registration_id.arr, 0, sizeof(registration_id.arr));
+    BCMBAL_CFG_PROP_SET(&sub_term_obj, subscriber_terminal, registration_id, registration_id);
+
+    BCMBAL_CFG_PROP_SET(&sub_term_obj, subscriber_terminal, admin_state, BCMBAL_STATE_UP);
+
+    if (bcmbal_cfg_set(DEFAULT_ATERM_ID, &(sub_term_obj.hdr))) {
+        std::cout << "ERROR: Failed to enable ONU: " << std::endl;
+        return Status(grpc::StatusCode::INTERNAL, "Failed to enable ONU");
+    }
+
+    return SchedAdd_(intf_id, onu_id, mk_agg_port_id(onu_id));
+
+    //return Status::OK;
+}
+
+#define MAX_CHAR_LENGTH  20
+#define MAX_OMCI_MSG_LENGTH 44
+Status OmciMsgOut_(uint32_t intf_id, uint32_t onu_id, const std::string pkt) {
+    bcmbal_u8_list_u32_max_2048 buf; /* A structure with a msg pointer and length value */
+    bcmos_errno err = BCM_ERR_OK;
+
+    /* The destination of the OMCI packet is a registered ONU on the OLT PON interface */
+    bcmbal_dest proxy_pkt_dest;
+
+    proxy_pkt_dest.type = BCMBAL_DEST_TYPE_ITU_OMCI_CHANNEL;
+    proxy_pkt_dest.u.itu_omci_channel.sub_term_id = onu_id;
+    proxy_pkt_dest.u.itu_omci_channel.intf_id = intf_id;
+
+    // ???
+    if ((pkt.size()/2) > MAX_OMCI_MSG_LENGTH) {
+        buf.len = MAX_OMCI_MSG_LENGTH;
+    } else {
+        buf.len = pkt.size()/2;
+    }
+
+    /* Send the OMCI packet using the BAL remote proxy API */
+    uint16_t idx1 = 0;
+    uint16_t idx2 = 0;
+    uint8_t arraySend[buf.len];
+    char str1[MAX_CHAR_LENGTH];
+    char str2[MAX_CHAR_LENGTH];
+    memset(&arraySend, 0, buf.len);
+
+    std::cout << "Sending omci msg to ONU of length is "
+         << buf.len
+         << std::endl;
+
+    for (idx1=0,idx2=0; idx1<((buf.len)*2); idx1++,idx2++) {
+       sprintf(str1,"%c", pkt[idx1]);
+       sprintf(str2,"%c", pkt[++idx1]);
+       strcat(str1,str2);
+       arraySend[idx2] = strtol(str1, NULL, 16);
+    }
+
+    buf.val = (uint8_t *)malloc((buf.len)*sizeof(uint8_t));
+    memcpy(buf.val, (uint8_t *)arraySend, buf.len);
+
+    std::cout << "After converting bytes to hex "
+              << buf.val << buf.len << std::endl;
+
+    err = bcmbal_pkt_send(0, proxy_pkt_dest, (const char *)(buf.val), buf.len);
+
+    std::cout << "OMCI request msg of length " << buf.len
+              << " sent to ONU" << onu_id
+              << " through PON " << intf_id << std::endl;
+
+    free(buf.val);
+
+    return Status::OK;
+}
+
+Status OnuPacketOut_(uint32_t intf_id, uint32_t onu_id, const std::string pkt) {
+    bcmos_errno err = BCM_ERR_OK;
+    bcmbal_dest proxy_pkt_dest;
+    bcmbal_u8_list_u32_max_2048 buf;
+
+    proxy_pkt_dest.type = BCMBAL_DEST_TYPE_SUB_TERM,
+    proxy_pkt_dest.u.sub_term.sub_term_id = onu_id;
+    proxy_pkt_dest.u.sub_term.intf_id = intf_id;
+
+    buf.len = pkt.size();
+    buf.val = (uint8_t *)malloc((buf.len)*sizeof(uint8_t));
+    memcpy(buf.val, (uint8_t *)pkt.data(), buf.len);
+
+    err = bcmbal_pkt_send(0, proxy_pkt_dest, (const char *)(buf.val), buf.len);
+
+    std::cout << "Packet out of length " << buf.len
+              << " sent to ONU" << onu_id
+              << " through PON " << intf_id << std::endl;
+
+    free(buf.val);
+
+    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,
+                const ::openolt::Classifier& classifier,
+                const ::openolt::Action& action) {
+    bcmos_errno err;
+    bcmbal_flow_cfg cfg;
+    bcmbal_flow_key key = { };
+
+    std::cout << "flow add -"
+              << " intf_id:" << access_intf_id
+              << " onu_id:" << onu_id
+              << " flow_id:" << flow_id
+              << " flow_type:" << flow_type
+              << " gemport_id:" << gemport_id
+              << " network_intf_id:" << network_intf_id
+              << std::endl;
+
+    key.flow_id = flow_id;
+    if (flow_type.compare("upstream") == 0 ) {
+        key.flow_type = BCMBAL_FLOW_TYPE_UPSTREAM;
+    } else if (flow_type.compare("downstream") == 0) {
+        key.flow_type = BCMBAL_FLOW_TYPE_DOWNSTREAM;
+    } else {
+        std::cout << "Invalid flow type " << flow_type << std::endl;
+        return Status::CANCELLED;
+    }
+
+    BCMBAL_CFG_INIT(&cfg, flow, key);
+
+    BCMBAL_CFG_PROP_SET(&cfg, flow, admin_state, BCMBAL_STATE_UP);
+    BCMBAL_CFG_PROP_SET(&cfg, flow, access_int_id, access_intf_id);
+    BCMBAL_CFG_PROP_SET(&cfg, flow, network_int_id, network_intf_id);
+    BCMBAL_CFG_PROP_SET(&cfg, flow, sub_term_id, onu_id);
+    BCMBAL_CFG_PROP_SET(&cfg, flow, svc_port_id, gemport_id);
+
+    {
+        bcmbal_classifier val = { };
+
+        if (classifier.o_tpid()) {
+            val.o_tpid = classifier.o_tpid();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_O_TPID;
+        }
+
+        if (classifier.o_vid()) {
+            val.o_vid = classifier.o_vid();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_O_VID;
+        }
+
+        if (classifier.i_tpid()) {
+            val.i_tpid = classifier.i_tpid();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_I_TPID;
+        }
+
+        if (classifier.i_vid()) {
+            val.i_vid = classifier.i_vid();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_I_VID;
+        }
+
+        if (classifier.o_pbits()) {
+            val.o_pbits = classifier.o_pbits();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_O_PBITS;
+        }
+
+        if (classifier.i_pbits()) {
+            val.i_pbits = classifier.i_pbits();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_I_PBITS;
+        }
+
+        if (classifier.eth_type()) {
+            val.ether_type = classifier.eth_type();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_ETHER_TYPE;
+        }
+
+        /*
+        if (classifier.dst_mac()) {
+            val.dst_mac = classifier.dst_mac();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_DST_MAC;
+        }
+
+        if (classifier.src_mac()) {
+            val.src_mac = classifier.src_mac();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_SRC_MAC;
+        }
+        */
+
+        if (classifier.ip_proto()) {
+            val.ip_proto = classifier.ip_proto();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_IP_PROTO;
+        }
+
+        /*
+        if (classifier.dst_ip()) {
+            val.dst_ip = classifier.dst_ip();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_DST_IP;
+        }
+
+        if (classifier.src_ip()) {
+            val.src_ip = classifier.src_ip();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_SRC_IP;
+        }
+        */
+
+        if (classifier.src_port()) {
+            val.src_port = classifier.src_port();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_SRC_PORT;
+        }
+
+        if (classifier.dst_port()) {
+            val.dst_port = classifier.dst_port();
+            val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_DST_PORT;
+        }
+
+        if (!classifier.pkt_tag_type().empty()) {
+            if (classifier.pkt_tag_type().compare("untagged") == 0) {
+                val.pkt_tag_type = BCMBAL_PKT_TAG_TYPE_UNTAGGED;
+                val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_PKT_TAG_TYPE;
+            } else if (classifier.pkt_tag_type().compare("single_tag") == 0) {
+                val.pkt_tag_type = BCMBAL_PKT_TAG_TYPE_SINGLE_TAG;
+                val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_PKT_TAG_TYPE;
+            } else if (classifier.pkt_tag_type().compare("double_tag") == 0) {
+                val.pkt_tag_type = BCMBAL_PKT_TAG_TYPE_DOUBLE_TAG;
+                val.presence_mask = val.presence_mask | BCMBAL_CLASSIFIER_ID_PKT_TAG_TYPE;
+            }
+        }
+
+        BCMBAL_CFG_PROP_SET(&cfg, flow, classifier, val);
+    }
+
+    {
+        bcmbal_action val = { };
+
+        const ::openolt::ActionCmd& cmd = action.cmd();
+
+        if (cmd.add_outer_tag()) {
+            val.cmds_bitmask |= BCMBAL_ACTION_CMD_ID_ADD_OUTER_TAG;
+            val.presence_mask |= BCMBAL_ACTION_ID_CMDS_BITMASK;
+        }
+
+        if (cmd.remove_outer_tag()) {
+            val.cmds_bitmask |= BCMBAL_ACTION_CMD_ID_REMOVE_OUTER_TAG;
+            val.presence_mask |= BCMBAL_ACTION_ID_CMDS_BITMASK;
+        }
+
+        if (cmd.trap_to_host()) {
+            val.cmds_bitmask |= BCMBAL_ACTION_CMD_ID_TRAP_TO_HOST;
+            val.presence_mask |= BCMBAL_ACTION_ID_CMDS_BITMASK;
+        }
+
+        if (action.o_vid()) {
+            val.o_vid = action.o_vid();
+            val.presence_mask = val.presence_mask | BCMBAL_ACTION_ID_O_VID;
+        }
+
+        if (action.o_pbits()) {
+            val.o_pbits = action.o_pbits();
+            val.presence_mask = val.presence_mask | BCMBAL_ACTION_ID_O_PBITS;
+        }
+
+        if (action.o_tpid()) {
+            val.o_tpid = action.o_tpid();
+            val.presence_mask = val.presence_mask | BCMBAL_ACTION_ID_O_TPID;
+        }
+
+        if (action.i_vid()) {
+            val.i_vid = action.i_vid();
+            val.presence_mask = val.presence_mask | BCMBAL_ACTION_ID_I_VID;
+        }
+
+        if (action.i_pbits()) {
+            val.i_pbits = action.i_pbits();
+            val.presence_mask = val.presence_mask | BCMBAL_ACTION_ID_I_PBITS;
+        }
+
+        if (action.i_tpid()) {
+            val.i_tpid = action.i_tpid();
+            val.presence_mask = val.presence_mask | BCMBAL_ACTION_ID_I_TPID;
+        }
+
+        BCMBAL_CFG_PROP_SET(&cfg, flow, action, val);
+    }
+
+    {
+        bcmbal_tm_sched_id val;
+        val = (bcmbal_tm_sched_id) mk_sched_id(onu_id);
+        BCMBAL_CFG_PROP_SET(&cfg, flow, dba_tm_sched_id, val);
+    }
+
+    if (bcmbal_cfg_set(DEFAULT_ATERM_ID, &(cfg.hdr))) {
+        std::cout << "ERROR: flow add failed" << std::endl;
+        return Status(grpc::StatusCode::INTERNAL, "flow add failed");
+    }
+
+    return Status::OK;
+}
+
+Status SchedAdd_(int intf_id, int onu_id, int agg_port_id) {
+    bcmbal_tm_sched_cfg cfg;
+    bcmbal_tm_sched_key key = { };
+    bcmbal_tm_sched_type sched_type;
+
+    key.id = mk_sched_id(onu_id);
+    key.dir = BCMBAL_TM_SCHED_DIR_US;
+
+    BCMBAL_CFG_INIT(&cfg, tm_sched, key);
+
+    {
+        bcmbal_tm_sched_owner val = { };
+
+        val.type = BCMBAL_TM_SCHED_OWNER_TYPE_AGG_PORT;
+        val.u.agg_port.intf_id = (bcmbal_intf_id) intf_id;
+	val.u.agg_port.presence_mask = val.u.agg_port.presence_mask | BCMBAL_TM_SCHED_OWNER_AGG_PORT_ID_INTF_ID;
+        val.u.agg_port.sub_term_id = (bcmbal_sub_id) onu_id;
+        val.u.agg_port.presence_mask = val.u.agg_port.presence_mask | BCMBAL_TM_SCHED_OWNER_AGG_PORT_ID_SUB_TERM_ID;
+
+	val.u.agg_port.agg_port_id = (bcmbal_aggregation_port_id) agg_port_id;
+	val.u.agg_port.presence_mask = val.u.agg_port.presence_mask | BCMBAL_TM_SCHED_OWNER_AGG_PORT_ID_AGG_PORT_ID;
+
+        BCMBAL_CFG_PROP_SET(&cfg, tm_sched, owner, val);
+    }
+
+    if (bcmbal_cfg_set(DEFAULT_ATERM_ID, &(cfg.hdr))) {
+        std::cout << "ERROR: Failed to create upstream DBA sched"
+                  << " id:" << key.id
+                  << " intf_id:" << intf_id
+                  << " onu_id:" << onu_id << std::endl;
+        return Status(grpc::StatusCode::INTERNAL, "Failed to create upstream DBA sched");
+        //return 1;
+    }
+    std::cout << "create upstream DBA sched"
+              << " id:" << key.id
+              << " intf_id:" << intf_id
+              << " onu_id:" << onu_id << std::endl;
+
+    return Status::OK;
+    //return 0;
+}