diff --git a/python/protos/openolt.proto b/python/protos/openolt.proto
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+// Copyright (c) 2018 Open Networking Foundation
+//
+// 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.
+
+syntax = "proto3";
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "google/api/annotations.proto";
+import "openflow_13.proto";
+
+
+
+service Openolt {
+
+    rpc DisableOlt(Empty) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/Disable"
+          body: "*"
+        };
+    }
+
+    rpc ReenableOlt(Empty) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/Reenable"
+          body: "*"
+        };
+    }
+
+    rpc ActivateOnu(Onu) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/EnableOnu"
+          body: "*"
+        };
+    }
+
+    rpc DeactivateOnu(Onu) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/DisableOnu"
+          body: "*"
+        };
+    }
+
+    rpc DeleteOnu(Onu) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/DeleteOnu"
+          body: "*"
+        };
+    }
+
+    rpc OmciMsgOut(OmciMsg) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/OmciMsgOut"
+          body: "*"
+        };
+    }
+
+    rpc OnuPacketOut(OnuPacket) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/OnuPacketOut"
+          body: "*"
+        };
+    }
+
+    rpc UplinkPacketOut(UplinkPacket) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/UplinkPacketOut"
+          body: "*"
+        };
+    }
+
+    rpc FlowAdd(Flow) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/FlowAdd"
+          body: "*"
+        };
+    }
+
+    rpc FlowRemove(Flow) returns (Empty) {
+        option (google.api.http) = {
+          post: "/v1/FlowRemove"
+          body: "*"
+        };
+    }
+
+    rpc HeartbeatCheck(Empty) returns (Heartbeat) {
+        option (google.api.http) = {
+          post: "/v1/HeartbeatCheck"
+          body: "*"
+        };
+    }
+
+    rpc EnablePonIf(Interface) returns (Empty) {
+        option (google.api.http) = {
+            post: "/v1/EnablePonIf"
+            body: "*"
+        };
+    }
+
+    rpc DisablePonIf(Interface) returns (Empty) {
+        option (google.api.http) = {
+            post: "/v1/DisablePonIf"
+            body: "*"
+        };
+    }
+
+    rpc GetDeviceInfo(Empty) returns (DeviceInfo) {
+        option (google.api.http) = {
+            post: "/v1/GetDeviceInfo"
+            body: "*"
+        };
+    }
+
+    rpc Reboot(Empty) returns (Empty) {
+         option (google.api.http) = {
+            post: "/v1/Reboot"
+            body: "*"
+        };
+    }
+
+    rpc CollectStatistics(Empty) returns (Empty) {
+        option (google.api.http) = {
+            post: "/v1/CollectStatistics"
+            body: "*"
+        };
+    }
+
+    rpc EnableIndication(Empty) returns (stream Indication) {}
+}
+
+message Indication {
+    oneof data {
+        OltIndication olt_ind = 1;
+        IntfIndication intf_ind = 2;
+        IntfOperIndication intf_oper_ind = 3;
+        OnuDiscIndication onu_disc_ind = 4;
+        OnuIndication onu_ind = 5;
+        OmciIndication omci_ind = 6;
+        PacketIndication pkt_ind = 7;
+        PortStatistics port_stats = 8;
+        FlowStatistics flow_stats = 9;
+        AlarmIndication alarm_ind= 10;
+    }
+}
+
+message AlarmIndication {
+    oneof data {
+        LosIndication los_ind = 1;
+        DyingGaspIndication dying_gasp_ind = 2;
+        OnuAlarmIndication onu_alarm_ind = 3;
+        OnuStartupFailureIndication onu_startup_fail_ind = 4;
+        OnuSignalDegradeIndication onu_signal_degrade_ind = 5;
+        OnuDriftOfWindowIndication onu_drift_of_window_ind = 6;
+        OnuLossOfOmciChannelIndication onu_loss_omci_ind = 7;
+        OnuSignalsFailureIndication onu_signals_fail_ind = 8;
+        OnuTransmissionInterferenceWarning onu_tiwi_ind = 9;
+        OnuActivationFailureIndication onu_activation_fail_ind = 10;
+        OnuProcessingErrorIndication onu_processing_error_ind = 11;
+    }
+}
+
+message OltIndication {
+    string oper_state = 1;	// up, down
+}
+
+message IntfIndication {
+    fixed32 intf_id = 1;
+    string oper_state = 2;      // up, down
+}
+
+message OnuDiscIndication {
+    fixed32 intf_id = 1;
+    SerialNumber serial_number = 2;
+}
+
+message OnuIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string oper_state = 3;      // up, down
+    string admin_state = 5;     // up, down
+    SerialNumber serial_number = 4;
+}
+
+message IntfOperIndication {
+    string type = 1;		// nni, pon
+    fixed32 intf_id = 2;
+    string oper_state = 3;      // up, down
+}
+
+message OmciIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    bytes pkt = 3;
+}
+
+message PacketIndication {
+    string intf_type = 5;		// nni, pon, unknown
+    fixed32 intf_id = 1;
+    fixed32 gemport_id = 2;
+    fixed32 flow_id = 3;
+    bytes pkt = 4;
+}
+
+message Interface {
+    fixed32 intf_id = 1;
+}
+
+message Heartbeat {
+    fixed32 heartbeat_signature = 1;
+}
+
+message Onu {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    SerialNumber serial_number = 3;
+    fixed32 pir = 4;   // peak information rate assigned to onu
+    fixed32 alloc_id = 5;
+}
+
+message OmciMsg {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    bytes pkt = 3;
+}
+
+message OnuPacket {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    bytes pkt = 3;
+}
+
+message UplinkPacket {
+    fixed32 intf_id = 1;
+    bytes pkt = 2;
+}
+
+message DeviceInfo {
+    string vendor = 1;
+    string model = 2;
+    string hardware_version = 3;
+    string firmware_version = 4;
+
+    // Total number of pon intf ports on the device
+    fixed32 pon_ports = 12;
+
+    // If using global per-device technology profile. To be deprecated
+    string technology = 5;
+    fixed32 onu_id_start = 6;
+    fixed32 onu_id_end = 7;
+    fixed32 alloc_id_start = 8;
+    fixed32 alloc_id_end = 9;
+    fixed32 gemport_id_start = 10;
+    fixed32 gemport_id_end = 11;
+    fixed32 flow_id_start = 13;
+    fixed32 flow_id_end = 14;
+
+    message DeviceResourceRanges {
+
+        // List of 0 or more intf_ids that use the same technology and pools.
+        // If 0 intf_ids supplied, it implies ALL interfaces
+        repeated fixed32 intf_ids = 1;
+
+        // Technology profile for this pool
+        string technology = 2;
+
+        message Pool {
+            enum PoolType {
+                ONU_ID = 0;
+                ALLOC_ID = 1;
+                GEMPORT_ID = 2;
+                FLOW_ID = 3;
+            }
+
+            enum SharingType {
+                DEDICATED_PER_INTF = 0;
+                SHARED_BY_ALL_INTF_ALL_TECH = 1; // Shared across all interfaces in all technologies in all ranges
+                SHARED_BY_ALL_INTF_SAME_TECH = 2; // Shared across all interfaces of the same technology used in this range
+            }
+
+            PoolType type = 1;
+	    SharingType sharing = 2;
+	    fixed32 start = 3; // lower bound on IDs allocated from this pool
+	    fixed32 end = 4; // upper bound on IDs allocated from this pool
+	}
+        repeated Pool pools = 3;
+    }
+    repeated DeviceResourceRanges ranges = 15;
+}
+
+message Classifier {
+    fixed32 o_tpid = 1;
+    fixed32 o_vid = 2;
+    fixed32 i_tpid = 3;
+    fixed32 i_vid = 4;
+    fixed32 o_pbits = 5;
+    fixed32 i_pbits = 6;
+    fixed32 eth_type = 7;
+    bytes dst_mac = 8;
+    bytes src_mac = 9;
+    fixed32 ip_proto = 10;
+    fixed32 dst_ip = 11;
+    fixed32 src_ip = 12;
+    fixed32 src_port = 13;
+    fixed32 dst_port = 14;
+    string pkt_tag_type = 15;	// untagged, single_tag, double_tag
+}
+
+message ActionCmd {
+    bool add_outer_tag = 1;
+    bool remove_outer_tag = 2;
+    bool trap_to_host = 3;
+}
+
+message Action {
+    ActionCmd cmd = 1;
+    fixed32 o_vid = 2;
+    fixed32 o_pbits = 3;
+    fixed32 o_tpid = 4;
+    fixed32 i_vid = 5;
+    fixed32 i_pbits = 6;
+    fixed32 i_tpid = 7;
+}
+
+message Flow {
+    sfixed32 access_intf_id = 1;
+    sfixed32 onu_id = 2;
+    fixed32 flow_id = 3;
+    string flow_type = 4;	// upstream, downstream, broadcast, multicast
+    sfixed32 alloc_id = 10;
+    sfixed32 network_intf_id = 5;
+    sfixed32 gemport_id = 6;
+    Classifier classifier = 7;
+    Action action = 8;
+    sfixed32 priority = 9;
+}
+
+message SerialNumber {
+    bytes vendor_id = 1;
+    bytes vendor_specific = 2;
+}
+
+message PortStatistics {
+    fixed32 intf_id = 1;
+    fixed64 rx_bytes = 2;
+    fixed64 rx_packets = 3;
+    fixed64 rx_ucast_packets = 4;
+    fixed64 rx_mcast_packets = 5;
+    fixed64 rx_bcast_packets = 6;
+    fixed64 rx_error_packets = 7;
+    fixed64 tx_bytes = 8;
+    fixed64 tx_packets = 9;
+    fixed64 tx_ucast_packets = 10;
+    fixed64 tx_mcast_packets = 11;
+    fixed64 tx_bcast_packets = 12;
+    fixed64 tx_error_packets = 13;
+    fixed64 rx_crc_errors = 14;
+    fixed64 bip_errors = 15;
+    fixed32 timestamp = 16;
+}
+
+message FlowStatistics {
+    fixed32 flow_id = 1;
+    fixed64 rx_bytes = 2;
+    fixed64 rx_packets = 3;
+    fixed64 tx_bytes = 8;
+    fixed64 tx_packets = 9;
+    fixed32 timestamp = 16;
+}
+
+message LosIndication {
+    fixed32 intf_id = 1;
+    string status = 2;
+}
+
+message DyingGaspIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string status = 3;
+}
+
+message OnuAlarmIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string los_status = 3;
+    string lob_status = 4;
+    string lopc_miss_status = 5;
+    string lopc_mic_error_status = 6;
+}
+
+message OnuStartupFailureIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string status = 3;
+}
+
+message OnuSignalDegradeIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string status = 3;
+    fixed32 inverse_bit_error_rate = 4;
+}
+
+message OnuDriftOfWindowIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string status = 3;
+    fixed32 drift = 4;
+    fixed32 new_eqd = 5;
+}
+
+message OnuLossOfOmciChannelIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string status = 3;
+}
+
+message OnuSignalsFailureIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string status = 3;
+    fixed32 inverse_bit_error_rate = 4;
+}
+
+message OnuTransmissionInterferenceWarning {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+    string status = 3;
+    fixed32 drift = 4;
+}
+
+message OnuActivationFailureIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+}
+
+message OnuProcessingErrorIndication {
+    fixed32 intf_id = 1;
+    fixed32 onu_id = 2;
+}
+
+
+message Empty {}