diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderRegistryClientProxy.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderRegistryClientProxy.java
new file mode 100644
index 0000000..cad0fbb
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderRegistryClientProxy.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.incubator.rpc.grpc;
+
+import java.util.Map;
+
+import org.onosproject.net.device.DeviceProvider;
+import org.onosproject.net.device.DeviceProviderRegistry;
+import org.onosproject.net.device.DeviceProviderService;
+import org.onosproject.net.provider.AbstractProviderRegistry;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.collect.Maps;
+
+import io.grpc.Channel;
+import io.grpc.ManagedChannel;
+
+// gRPC Client side
+/**
+ * Proxy object to handle DeviceProviderRegistry calls.
+ *
+ * RPC wise, this will start/stop bidirectional streaming service sessions.
+ */
+final class DeviceProviderRegistryClientProxy
+        extends AbstractProviderRegistry<DeviceProvider, DeviceProviderService>
+        implements DeviceProviderRegistry {
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    private final Channel channel;
+
+    private final Map<DeviceProvider, DeviceProviderServiceClientProxy> pServices;
+
+    DeviceProviderRegistryClientProxy(ManagedChannel channel) {
+        this.channel = channel;
+        pServices = Maps.newIdentityHashMap();
+    }
+
+    @Override
+    protected synchronized DeviceProviderService createProviderService(DeviceProvider provider) {
+
+        // Create session
+        DeviceProviderServiceClientProxy pService = new DeviceProviderServiceClientProxy(provider, channel);
+        log.debug("Created DeviceProviderServiceClientProxy", pService);
+
+        DeviceProviderServiceClientProxy old = pServices.put(provider, pService);
+        if (old != null) {
+            // sanity check, can go away
+            log.warn("Duplicate registration detected for {}", provider.id());
+        }
+        return pService;
+    }
+
+    @Override
+    public synchronized void unregister(DeviceProvider provider) {
+        DeviceProviderServiceClientProxy pService = pServices.remove(provider);
+        log.debug("Unregistering DeviceProviderServiceClientProxy", pService);
+        super.unregister(provider);
+        if (pService != null) {
+            pService.shutdown();
+        }
+    }
+}
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderServiceClientProxy.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderServiceClientProxy.java
new file mode 100644
index 0000000..498011f
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/DeviceProviderServiceClientProxy.java
@@ -0,0 +1,295 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.incubator.rpc.grpc;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static java.util.stream.Collectors.toList;
+import static org.onosproject.incubator.rpc.grpc.GrpcDeviceUtils.translate;
+import static org.onosproject.net.DeviceId.deviceId;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.onosproject.grpc.Device.DeviceProviderMsg;
+import org.onosproject.grpc.Device.DeviceProviderServiceMsg;
+import org.onosproject.grpc.Device.IsReachableRequest;
+import org.onosproject.grpc.Device.RoleChanged;
+import org.onosproject.grpc.Device.TriggerProbe;
+import org.onosproject.grpc.DeviceProviderRegistryRpcGrpc;
+import org.onosproject.grpc.DeviceProviderRegistryRpcGrpc.DeviceProviderRegistryRpcStub;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.MastershipRole;
+import org.onosproject.net.device.DeviceDescription;
+import org.onosproject.net.device.DeviceProvider;
+import org.onosproject.net.device.DeviceProviderService;
+import org.onosproject.net.device.PortDescription;
+import org.onosproject.net.device.PortStatistics;
+import org.onosproject.net.provider.AbstractProviderService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+import io.grpc.Channel;
+import io.grpc.stub.StreamObserver;
+
+// gRPC Client side
+// gRPC wise, this object represents bidirectional streaming service session
+// and deals with outgoing message stream
+/**
+ * DeviceProviderService instance associated with given DeviceProvider.
+ */
+final class DeviceProviderServiceClientProxy
+        extends AbstractProviderService<DeviceProvider>
+        implements DeviceProviderService {
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    private final StreamObserver<DeviceProviderServiceMsg> devProvService;
+    private final AtomicBoolean hasShutdown = new AtomicBoolean(false);
+
+    private final Channel channel;
+
+    DeviceProviderServiceClientProxy(DeviceProvider provider, Channel channel) {
+        super(provider);
+        this.channel = channel;
+
+        DeviceProviderRegistryRpcStub stub = DeviceProviderRegistryRpcGrpc.newStub(channel);
+        log.debug("Calling RPC register({}) against {}", provider.id(), channel.authority());
+        devProvService = stub.register(new DeviceProviderClientProxy(provider));
+
+        // send initialize message
+        DeviceProviderServiceMsg.Builder builder = DeviceProviderServiceMsg.newBuilder();
+        builder.setRegisterProvider(builder.getRegisterProviderBuilder()
+                                    .setProviderScheme(provider.id().scheme())
+                                    .build());
+        devProvService.onNext(builder.build());
+    }
+
+    @Override
+    public void deviceConnected(DeviceId deviceId,
+                                DeviceDescription deviceDescription) {
+        checkValidity();
+
+        DeviceProviderServiceMsg.Builder builder = DeviceProviderServiceMsg.newBuilder();
+        builder.setDeviceConnected(builder.getDeviceConnectedBuilder()
+                                      .setDeviceId(deviceId.toString())
+                                      .setDeviceDescription(translate(deviceDescription))
+                                      .build());
+
+        devProvService.onNext(builder.build());
+    }
+
+    @Override
+    public void deviceDisconnected(DeviceId deviceId) {
+        checkValidity();
+
+        DeviceProviderServiceMsg.Builder builder = DeviceProviderServiceMsg.newBuilder();
+        builder.setDeviceDisconnected(builder.getDeviceDisconnectedBuilder()
+                                      .setDeviceId(deviceId.toString())
+                                      .build());
+
+        devProvService.onNext(builder.build());
+    }
+
+    @Override
+    public void updatePorts(DeviceId deviceId,
+                            List<PortDescription> portDescriptions) {
+        checkValidity();
+
+        DeviceProviderServiceMsg.Builder builder = DeviceProviderServiceMsg.newBuilder();
+        List<org.onosproject.grpc.Port.PortDescription> portDescs =
+                portDescriptions.stream()
+                    .map(GrpcDeviceUtils::translate)
+                    .collect(toList());
+
+        builder.setUpdatePorts(builder.getUpdatePortsBuilder()
+                               .setDeviceId(deviceId.toString())
+                               .addAllPortDescriptions(portDescs)
+                               .build());
+
+        devProvService.onNext(builder.build());
+    }
+
+    @Override
+    public void portStatusChanged(DeviceId deviceId,
+                                  PortDescription portDescription) {
+        checkValidity();
+
+        DeviceProviderServiceMsg.Builder builder = DeviceProviderServiceMsg.newBuilder();
+        builder.setPortStatusChanged(builder.getPortStatusChangedBuilder()
+                                      .setDeviceId(deviceId.toString())
+                                      .setPortDescription(translate(portDescription))
+                                      .build());
+
+        devProvService.onNext(builder.build());
+    }
+
+    @Override
+    public void receivedRoleReply(DeviceId deviceId, MastershipRole requested,
+                                  MastershipRole response) {
+        checkValidity();
+
+        DeviceProviderServiceMsg.Builder builder = DeviceProviderServiceMsg.newBuilder();
+        builder.setReceivedRoleReply(builder.getReceivedRoleReplyBuilder()
+                                      .setDeviceId(deviceId.toString())
+                                      .setRequested(translate(requested))
+                                      .setResponse(translate(response))
+                                      .build());
+
+        devProvService.onNext(builder.build());
+    }
+
+    @Override
+    public void updatePortStatistics(DeviceId deviceId,
+                                     Collection<PortStatistics> portStatistics) {
+        checkValidity();
+
+        DeviceProviderServiceMsg.Builder builder = DeviceProviderServiceMsg.newBuilder();
+        List<org.onosproject.grpc.Port.PortStatistics> portStats =
+                portStatistics.stream()
+                    .map(GrpcDeviceUtils::translate)
+                    .collect(toList());
+        builder.setUpdatePortStatistics(builder.getUpdatePortStatisticsBuilder()
+                                      .setDeviceId(deviceId.toString())
+                                      .addAllPortStatistics(portStats)
+                                      .build());
+
+        devProvService.onNext(builder.build());
+    }
+
+    /**
+     * Shutdown this session.
+     */
+    public void shutdown() {
+        if (hasShutdown.compareAndSet(false, true)) {
+            log.info("Shutting down session over {}", channel.authority());
+            // initiate clean shutdown from client
+            devProvService.onCompleted();
+            invalidate();
+        }
+    }
+
+    /**
+     * Abnormally terminate this session.
+     * @param t error details
+     */
+    public void shutdown(Throwable t) {
+        if (hasShutdown.compareAndSet(false, true)) {
+            log.error("Shutting down session over {}", channel.authority());
+            // initiate abnormal termination from client
+            devProvService.onError(t);
+            invalidate();
+        }
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+            .add("channel", channel.authority())
+            .add("hasShutdown", hasShutdown.get())
+            .toString();
+    }
+
+    // gRPC wise, this object handles incoming message stream
+    /**
+     * Translates DeviceProvider instructions received from RPC to Java calls.
+     */
+    private final class DeviceProviderClientProxy
+            implements StreamObserver<DeviceProviderMsg> {
+
+        private final DeviceProvider provider;
+
+        DeviceProviderClientProxy(DeviceProvider provider) {
+            this.provider = checkNotNull(provider);
+        }
+
+        @Override
+        public void onNext(DeviceProviderMsg msg) {
+            try {
+                log.trace("DeviceProviderClientProxy received: {}", msg);
+                onMethod(msg);
+            } catch (Exception e) {
+                log.error("Exception caught handling {} at DeviceProviderClientProxy", msg, e);
+                // initiate shutdown from client
+                shutdown(e);
+            }
+        }
+
+        /**
+         * Translates received RPC message to {@link DeviceProvider} method calls.
+         * @param msg DeviceProvider message
+         */
+        private void onMethod(DeviceProviderMsg msg) {
+            switch (msg.getMethodCase()) {
+            case TRIGGER_PROBE:
+                TriggerProbe triggerProbe = msg.getTriggerProbe();
+                provider.triggerProbe(deviceId(triggerProbe.getDeviceId()));
+                break;
+            case ROLE_CHANGED:
+                RoleChanged roleChanged = msg.getRoleChanged();
+                provider.roleChanged(deviceId(roleChanged.getDeviceId()),
+                                     translate(roleChanged.getNewRole()));
+                break;
+            case IS_REACHABLE_REQUEST:
+                IsReachableRequest isReachableRequest = msg.getIsReachableRequest();
+                // check if reachable
+                boolean reachable = provider.isReachable(deviceId(isReachableRequest.getDeviceId()));
+
+                int xid = isReachableRequest.getXid();
+                // send response back DeviceProviderService channel
+                DeviceProviderServiceMsg.Builder builder = DeviceProviderServiceMsg.newBuilder();
+                builder.setIsReachableResponse(builder.getIsReachableResponseBuilder()
+                                               .setXid(xid)
+                                               .setIsReachable(reachable)
+                                               .build());
+                devProvService.onNext(builder.build());
+                break;
+
+            case METHOD_NOT_SET:
+            default:
+                log.warn("Unexpected method, ignoring", msg);
+                break;
+            }
+        }
+
+        @Override
+        public void onCompleted() {
+            log.info("DeviceProviderClientProxy completed");
+            // session terminated from remote
+            // TODO unregister...? how?
+
+            //devProvService.onCompleted();
+        }
+
+        @Override
+        public void onError(Throwable t) {
+            log.error("DeviceProviderClientProxy#onError", t);
+            // session terminated from remote
+            // TODO unregister...? how?
+            //devProvService.onError(t);
+        }
+
+        @Override
+        public String toString() {
+            return MoreObjects.toStringHelper(this)
+                    .add("channel", channel.authority())
+                    .toString();
+        }
+    }
+}
+
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcDeviceUtils.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcDeviceUtils.java
new file mode 100644
index 0000000..7045b0c
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcDeviceUtils.java
@@ -0,0 +1,381 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.incubator.rpc.grpc;
+
+import java.net.URI;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.onlab.packet.ChassisId;
+import org.onosproject.grpc.Device.DeviceType;
+import org.onosproject.grpc.Port.PortType;
+import org.onosproject.net.Annotations;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.Device;
+import org.onosproject.net.MastershipRole;
+import org.onosproject.net.Port;
+import org.onosproject.net.Port.Type;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.SparseAnnotations;
+import org.onosproject.net.device.DefaultDeviceDescription;
+import org.onosproject.net.device.DefaultPortDescription;
+import org.onosproject.net.device.DefaultPortStatistics;
+import org.onosproject.net.device.DeviceDescription;
+import org.onosproject.net.device.PortDescription;
+import org.onosproject.net.device.PortStatistics;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.api.client.repackaged.com.google.common.annotations.Beta;
+
+/**
+ * gRPC message conversion related utilities.
+ */
+@Beta
+public final class GrpcDeviceUtils {
+
+    private static final Logger log = LoggerFactory.getLogger(GrpcDeviceUtils.class);
+
+    /**
+     * Translates gRPC enum MastershipRole to ONOS enum.
+     *
+     * @param role mastership role in gRPC enum
+     * @return equivalent in ONOS enum
+     */
+    public static MastershipRole translate(org.onosproject.grpc.Device.MastershipRole role) {
+        switch (role) {
+        case NONE:
+            return MastershipRole.NONE;
+        case MASTER:
+            return MastershipRole.MASTER;
+        case STANDBY:
+            return MastershipRole.STANDBY;
+        case UNRECOGNIZED:
+            log.warn("Unrecognized MastershipRole gRPC message: {}", role);
+        default:
+            return MastershipRole.NONE;
+        }
+    }
+
+    /**
+     * Translates ONOS enum MastershipRole to gRPC enum.
+     *
+     * @param newRole ONOS' mastership role
+     * @return equivalent in gRPC message enum
+     */
+    public static org.onosproject.grpc.Device.MastershipRole translate(MastershipRole newRole) {
+        switch (newRole) {
+        case MASTER:
+            return org.onosproject.grpc.Device.MastershipRole.MASTER;
+        case STANDBY:
+            return org.onosproject.grpc.Device.MastershipRole.STANDBY;
+        case NONE:
+        default:
+            return org.onosproject.grpc.Device.MastershipRole.NONE;
+        }
+    }
+
+
+    /**
+     * Translates gRPC DeviceDescription to {@link DeviceDescription}.
+     *
+     * @param deviceDescription gRPC message
+     * @return {@link DeviceDescription}
+     */
+    public static DeviceDescription translate(org.onosproject.grpc.Device.DeviceDescription deviceDescription) {
+        URI uri = URI.create(deviceDescription.getDeviceUri());
+        Device.Type type = translate(deviceDescription.getType());
+        String manufacturer = deviceDescription.getManufacturer();
+        String hwVersion = deviceDescription.getHwVersion();
+        String swVersion = deviceDescription.getSwVersion();
+        String serialNumber = deviceDescription.getSerialNumber();
+        ChassisId chassis = new ChassisId(deviceDescription.getChassisId());
+        return new DefaultDeviceDescription(uri, type, manufacturer,
+                                            hwVersion, swVersion, serialNumber,
+                                            chassis,
+                                            asAnnotations(deviceDescription.getAnnotations()));
+    }
+
+    /**
+     * Translates {@link DeviceDescription} to gRPC DeviceDescription message.
+     *
+     * @param deviceDescription {@link DeviceDescription}
+     * @return gRPC DeviceDescription message
+     */
+    public static org.onosproject.grpc.Device.DeviceDescription translate(DeviceDescription deviceDescription) {
+
+        return org.onosproject.grpc.Device.DeviceDescription.newBuilder()
+            .setDeviceUri(deviceDescription.deviceUri().toString())
+            .setType(translate(deviceDescription.type()))
+            .setManufacturer(deviceDescription.manufacturer())
+            .setHwVersion(deviceDescription.hwVersion())
+            .setSwVersion(deviceDescription.swVersion())
+            .setSerialNumber(deviceDescription.serialNumber())
+            .setChassisId(deviceDescription.chassisId().toString())
+            .putAllAnnotations(asMap(deviceDescription.annotations()))
+            .build();
+    }
+
+
+    /**
+     * Translates gRPC DeviceType to {@link Device.Type}.
+     *
+     * @param type      gRPC message
+     * @return  {@link Device.Type}
+     */
+    public static Device.Type translate(org.onosproject.grpc.Device.DeviceType type) {
+        switch (type) {
+        case BALANCER:
+            return Device.Type.BALANCER;
+        case CONTROLLER:
+            return Device.Type.CONTROLLER;
+        case FIBER_SWITCH:
+            return Device.Type.FIBER_SWITCH;
+        case FIREWALL:
+            return Device.Type.FIREWALL;
+        case IDS:
+            return Device.Type.IDS;
+        case IPS:
+            return Device.Type.IPS;
+        case MICROWAVE:
+            return Device.Type.MICROWAVE;
+        case OTHER:
+            return Device.Type.OTHER;
+        case OTN:
+            return Device.Type.OTN;
+        case ROADM:
+            return Device.Type.ROADM;
+        case ROADM_OTN:
+            return Device.Type.ROADM_OTN;
+        case ROUTER:
+            return Device.Type.ROUTER;
+        case SWITCH:
+            return Device.Type.SWITCH;
+        case VIRTUAL:
+            return Device.Type.VIRTUAL;
+
+        case UNRECOGNIZED:
+        default:
+            log.warn("Unexpected DeviceType: {}", type);
+            return Device.Type.OTHER;
+        }
+    }
+
+    /**
+     * Translates {@link Type} to gRPC DeviceType.
+     *
+     * @param type {@link Type}
+     * @return  gRPC message
+     */
+    public static DeviceType translate(Device.Type type) {
+        switch (type) {
+        case BALANCER:
+            return DeviceType.BALANCER;
+        case CONTROLLER:
+            return DeviceType.CONTROLLER;
+        case FIBER_SWITCH:
+            return DeviceType.FIBER_SWITCH;
+        case FIREWALL:
+            return DeviceType.FIREWALL;
+        case IDS:
+            return DeviceType.IDS;
+        case IPS:
+            return DeviceType.IPS;
+        case MICROWAVE:
+            return DeviceType.MICROWAVE;
+        case OTHER:
+            return DeviceType.OTHER;
+        case OTN:
+            return DeviceType.OTN;
+        case ROADM:
+            return DeviceType.ROADM;
+        case ROADM_OTN:
+            return DeviceType.ROADM_OTN;
+        case ROUTER:
+            return DeviceType.ROUTER;
+        case SWITCH:
+            return DeviceType.SWITCH;
+        case VIRTUAL:
+            return DeviceType.VIRTUAL;
+
+        default:
+            log.warn("Unexpected Device.Type: {}", type);
+            return DeviceType.OTHER;
+        }
+    }
+
+    /**
+     * Translates gRPC PortDescription message to {@link PortDescription}.
+     *
+     * @param portDescription gRPC message
+     * @return {@link PortDescription}
+     */
+    public static PortDescription translate(org.onosproject.grpc.Port.PortDescription portDescription) {
+        PortNumber number = PortNumber.fromString(portDescription.getPortNumber());
+        boolean isEnabled = portDescription.getIsEnabled();
+        Port.Type type = translate(portDescription.getType());
+        long portSpeed = portDescription.getPortSpeed();
+        SparseAnnotations annotations = asAnnotations(portDescription.getAnnotations());
+        // TODO How to deal with more specific Port...
+        return new DefaultPortDescription(number, isEnabled, type, portSpeed, annotations);
+    }
+
+    /**
+     * Translates {@link PortDescription} to gRPC PortDescription message.
+     *
+     * @param portDescription {@link PortDescription}
+     * @return gRPC PortDescription message
+     */
+    public static org.onosproject.grpc.Port.PortDescription translate(PortDescription portDescription) {
+        // TODO How to deal with more specific Port...
+        return org.onosproject.grpc.Port.PortDescription.newBuilder()
+                .setPortNumber(portDescription.portNumber().toString())
+                .setIsEnabled(portDescription.isEnabled())
+                .setType(translate(portDescription.type()))
+                .setPortSpeed(portDescription.portSpeed())
+                .putAllAnnotations(asMap(portDescription.annotations()))
+                .build();
+    }
+
+    /**
+     * Translates gRPC PortType to {@link Port.Type}.
+     *
+     * @param type      gRPC message
+     * @return  {@link Port.Type}
+     */
+    public static Port.Type translate(PortType type) {
+        switch (type) {
+        case COPPER:
+            return Type.COPPER;
+        case FIBER:
+            return Type.FIBER;
+        case OCH:
+            return Type.OCH;
+        case ODUCLT:
+            return Type.ODUCLT;
+        case OMS:
+            return Type.OMS;
+        case PACKET:
+            return Type.PACKET;
+        case VIRTUAL:
+            return Type.VIRTUAL;
+
+        case UNRECOGNIZED:
+        default:
+            log.warn("Unexpected PortType: {}", type);
+            return Type.COPPER;
+        }
+    }
+
+    /**
+     * Translates {@link Port.Type} to gRPC PortType.
+     *
+     * @param type      {@link Port.Type}
+     * @return  gRPC message
+     */
+    public static PortType translate(Port.Type type) {
+        switch (type) {
+        case COPPER:
+            return PortType.COPPER;
+        case FIBER:
+            return PortType.FIBER;
+        case OCH:
+            return PortType.OCH;
+        case ODUCLT:
+            return PortType.ODUCLT;
+        case OMS:
+            return PortType.OMS;
+        case PACKET:
+            return PortType.PACKET;
+        case VIRTUAL:
+            return PortType.VIRTUAL;
+
+        default:
+            log.warn("Unexpected Port.Type: {}", type);
+            return PortType.COPPER;
+        }
+    }
+
+    /**
+     * Translates gRPC PortStatistics message to {@link PortStatistics}.
+     *
+     * @param portStatistics gRPC PortStatistics message
+     * @return {@link PortStatistics}
+     */
+    public static PortStatistics translate(org.onosproject.grpc.Port.PortStatistics portStatistics) {
+        // TODO implement adding missing fields
+        return DefaultPortStatistics.builder()
+                .setPort(portStatistics.getPort())
+                .setPacketsReceived(portStatistics.getPacketsReceived())
+                .setPacketsSent(portStatistics.getPacketsSent())
+                .build();
+    }
+
+    /**
+     * Translates {@link PortStatistics} to gRPC PortStatistics message.
+     *
+     * @param portStatistics {@link PortStatistics}
+     * @return gRPC PortStatistics message
+     */
+    public static org.onosproject.grpc.Port.PortStatistics translate(PortStatistics portStatistics) {
+        // TODO implement adding missing fields
+        return org.onosproject.grpc.Port.PortStatistics.newBuilder()
+                .setPort(portStatistics.port())
+                .setPacketsReceived(portStatistics.packetsReceived())
+                .setPacketsSent(portStatistics.packetsSent())
+                .build();
+    }
+
+    // may be this can be moved to Annotation itself or AnnotationsUtils
+    /**
+     * Converts Annotations to Map of Strings.
+     *
+     * @param annotations {@link Annotations}
+     * @return Map of annotation key and values
+     */
+    public static Map<String, String> asMap(Annotations annotations) {
+        if (annotations instanceof DefaultAnnotations) {
+            return ((DefaultAnnotations) annotations).asMap();
+        }
+        Map<String, String> map = new HashMap<>();
+        annotations.keys()
+            .forEach(k -> map.put(k, annotations.value(k)));
+
+        return map;
+    }
+
+    // may be this can be moved to Annotation itself or AnnotationsUtils
+    /**
+     * Converts Map of Strings to {@link SparseAnnotations}.
+     *
+     * @param annotations Map of annotation key and values
+     * @return {@link SparseAnnotations}
+     */
+    public static SparseAnnotations asAnnotations(Map<String, String> annotations) {
+        DefaultAnnotations.Builder builder = DefaultAnnotations.builder();
+        annotations.entrySet().forEach(e -> {
+                if (e.getValue() != null) {
+                    builder.set(e.getKey(), e.getValue());
+                } else {
+                    builder.remove(e.getKey());
+                }
+            });
+        return builder.build();
+    }
+
+    // Utility class not intended for instantiation.
+    private GrpcDeviceUtils() {}
+}
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceContext.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceContext.java
new file mode 100644
index 0000000..b419a34
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceContext.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.incubator.rpc.grpc;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.onosproject.incubator.rpc.RemoteServiceContext;
+import org.onosproject.net.device.DeviceProviderRegistry;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+import io.grpc.ManagedChannel;
+
+// gRPC Client side
+// Probably there should be plug-in mechanism in the future.
+/**
+ * RemoteServiceContext based on gRPC.
+ *
+ * <p>
+ * Currently it supports {@link DeviceProviderRegistry}.
+ */
+public class GrpcRemoteServiceContext implements RemoteServiceContext {
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    private final Map<Class<? extends Object>, Object> services = new ConcurrentHashMap<>();
+
+    private final ManagedChannel channel;
+
+    public GrpcRemoteServiceContext(ManagedChannel channel) {
+        this.channel = checkNotNull(channel);
+        services.put(DeviceProviderRegistry.class, new DeviceProviderRegistryClientProxy(channel));
+    }
+
+
+    @Override
+    public <T> T get(Class<T> serviceClass) {
+        @SuppressWarnings("unchecked")
+        T service = (T) services.get(serviceClass);
+        if (service != null) {
+            return service;
+        }
+        log.error("{} not supported", serviceClass);
+        throw new NoSuchElementException(serviceClass.getTypeName() + " not supported");
+    }
+
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("services", services.keySet())
+                .add("channel", channel.authority())
+                .toString();
+    }
+
+}
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceProvider.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceProvider.java
new file mode 100644
index 0000000..7496218
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceProvider.java
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.incubator.rpc.grpc;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import java.net.URI;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onosproject.incubator.rpc.RemoteServiceContext;
+import org.onosproject.incubator.rpc.RemoteServiceContextProvider;
+import org.onosproject.incubator.rpc.RemoteServiceContextProviderService;
+import org.onosproject.incubator.rpc.RemoteServiceProviderRegistry;
+import org.onosproject.net.provider.ProviderId;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import io.grpc.ManagedChannel;
+import io.grpc.netty.NegotiationType;
+import io.grpc.netty.NettyChannelBuilder;
+
+
+// gRPC Client side
+/**
+ * RemoteServiceContextProvider based on gRPC.
+ */
+@Component(immediate = true)
+public class GrpcRemoteServiceProvider implements RemoteServiceContextProvider {
+
+    public static final String GRPC_SCHEME = "grpc";
+
+    public static final String RPC_PROVIDER_NAME = "org.onosproject.rpc.provider.grpc";
+
+    private static final ProviderId PID = new ProviderId(GRPC_SCHEME, RPC_PROVIDER_NAME);
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected RemoteServiceProviderRegistry rpcRegistry;
+
+    private Map<URI, ManagedChannel> channels = new ConcurrentHashMap<>();
+
+    private RemoteServiceContextProviderService providerService;
+
+
+    @Activate
+    protected void activate() {
+        providerService = rpcRegistry.register(this);
+
+        // FIXME remove me. test code to see if gRPC loads in karaf
+        //getChannel(URI.create("grpc://localhost:8080"));
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        rpcRegistry.unregister(this);
+
+        // shutdown all channels
+        channels.values().stream()
+            .forEach(ManagedChannel::shutdown);
+        // Should we wait for shutdown? How?
+        channels.clear();
+        log.info("Stopped");
+    }
+
+    @Override
+    public ProviderId id() {
+        return PID;
+    }
+
+    @Override
+    public RemoteServiceContext get(URI uri) {
+        // Create gRPC client
+        return new GrpcRemoteServiceContext(getChannel(uri));
+    }
+
+    private ManagedChannel getChannel(URI uri) {
+        checkArgument(Objects.equals(GRPC_SCHEME, uri.getScheme()),
+                      "Invalid URI scheme: %s", uri.getScheme());
+
+        return channels.compute(uri, (u, ch) -> {
+            if (ch != null && !ch.isShutdown()) {
+                return ch;
+            } else {
+                return createChannel(u);
+            }
+        });
+    }
+
+    private ManagedChannel createChannel(URI uri) {
+        log.debug("Creating channel for {}", uri);
+        return NettyChannelBuilder.forAddress(uri.getHost(), uri.getPort())
+                .negotiationType(NegotiationType.PLAINTEXT)
+                .build();
+    }
+
+}
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceServer.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceServer.java
new file mode 100644
index 0000000..4f43fa6
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/GrpcRemoteServiceServer.java
@@ -0,0 +1,385 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.incubator.rpc.grpc;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static java.util.stream.Collectors.toList;
+import static org.onosproject.incubator.rpc.grpc.GrpcDeviceUtils.translate;
+import static org.onosproject.net.DeviceId.deviceId;
+
+import java.io.IOException;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Modified;
+import org.apache.felix.scr.annotations.Property;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onosproject.grpc.Device.DeviceConnected;
+import org.onosproject.grpc.Device.DeviceDisconnected;
+import org.onosproject.grpc.Device.DeviceProviderMsg;
+import org.onosproject.grpc.Device.DeviceProviderServiceMsg;
+import org.onosproject.grpc.Device.IsReachableResponse;
+import org.onosproject.grpc.Device.PortStatusChanged;
+import org.onosproject.grpc.Device.ReceivedRoleReply;
+import org.onosproject.grpc.Device.RegisterProvider;
+import org.onosproject.grpc.Device.UpdatePortStatistics;
+import org.onosproject.grpc.Device.UpdatePorts;
+import org.onosproject.grpc.DeviceProviderRegistryRpcGrpc;
+import org.onosproject.grpc.DeviceProviderRegistryRpcGrpc.DeviceProviderRegistryRpc;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.MastershipRole;
+import org.onosproject.net.device.DeviceProvider;
+import org.onosproject.net.device.DeviceProviderRegistry;
+import org.onosproject.net.device.DeviceProviderService;
+import org.onosproject.net.provider.ProviderId;
+import org.osgi.service.component.ComponentContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.collect.Sets;
+
+import io.grpc.Server;
+import io.grpc.netty.NettyServerBuilder;
+import io.grpc.stub.StreamObserver;
+
+// gRPC Server on Metro-side
+// Translates request received on RPC channel, and calls corresponding Service on
+// Metro-ONOS cluster.
+/**
+ * Server side implementation of gRPC based RemoteService.
+ */
+@Component(immediate = true)
+public class GrpcRemoteServiceServer {
+
+    private static final String RPC_PROVIDER_NAME = "org.onosproject.rpc.provider.grpc";
+
+    // TODO pick a number
+    public static final int DEFAULT_LISTEN_PORT = 11984;
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DeviceProviderRegistry deviceProviderRegistry;
+
+
+    @Property(name = "listenPort", intValue = DEFAULT_LISTEN_PORT,
+            label = "Port to listen on")
+    protected int listenPort = DEFAULT_LISTEN_PORT;
+
+    private Server server;
+    private final Set<DeviceProviderServerProxy> registeredProviders = Sets.newConcurrentHashSet();
+
+    @Activate
+    protected void activate(ComponentContext context) throws IOException {
+        modified(context);
+
+        log.debug("Server starting on {}", listenPort);
+        try {
+            server  = NettyServerBuilder.forPort(listenPort)
+                    .addService(DeviceProviderRegistryRpcGrpc.bindService(new DeviceProviderRegistryServerProxy()))
+                    .build().start();
+        } catch (IOException e) {
+            log.error("Failed to start gRPC server", e);
+            throw e;
+        }
+
+        log.info("Started on {}", listenPort);
+    }
+
+    @Deactivate
+    protected void deactivate() {
+
+        registeredProviders.stream()
+            .forEach(deviceProviderRegistry::unregister);
+
+        server.shutdown();
+        // Should we wait for shutdown?
+        log.info("Stopped");
+    }
+
+    @Modified
+    public void modified(ComponentContext context) {
+        // TODO support dynamic reconfiguration and restarting server?
+    }
+
+    // RPC Server-side code
+    // RPC session Factory
+    /**
+     * Relays DeviceProviderRegistry calls from RPC client.
+     */
+    class DeviceProviderRegistryServerProxy implements DeviceProviderRegistryRpc {
+
+        @Override
+        public StreamObserver<DeviceProviderServiceMsg> register(StreamObserver<DeviceProviderMsg> toDeviceProvider) {
+            log.trace("DeviceProviderRegistryServerProxy#register called!");
+
+            DeviceProviderServerProxy provider = new DeviceProviderServerProxy(toDeviceProvider);
+
+            return new DeviceProviderServiceServerProxy(provider, toDeviceProvider);
+        }
+    }
+
+    // Lower -> Upper Controller message
+    // RPC Server-side code
+    // RPC session handler
+    private final class DeviceProviderServiceServerProxy
+            implements StreamObserver<DeviceProviderServiceMsg> {
+
+        // intentionally shadowing
+        private final Logger log = LoggerFactory.getLogger(getClass());
+
+        private final DeviceProviderServerProxy pairedProvider;
+        private final StreamObserver<DeviceProviderMsg> toDeviceProvider;
+
+        private final Cache<Integer, CompletableFuture<Boolean>> outstandingIsReachable;
+
+        // wrapped providerService
+        private DeviceProviderService deviceProviderService;
+
+
+        DeviceProviderServiceServerProxy(DeviceProviderServerProxy provider,
+                                         StreamObserver<DeviceProviderMsg> toDeviceProvider) {
+            this.pairedProvider = provider;
+            this.toDeviceProvider = toDeviceProvider;
+            outstandingIsReachable = CacheBuilder.newBuilder()
+                        .expireAfterWrite(1, TimeUnit.MINUTES)
+                        .build();
+
+            // pair RPC session in other direction
+            provider.pair(this);
+        }
+
+        @Override
+        public void onNext(DeviceProviderServiceMsg msg) {
+            try {
+                log.trace("DeviceProviderServiceServerProxy received: {}", msg);
+                onMethod(msg);
+            } catch (Exception e) {
+                log.error("Exception thrown handling {}", msg, e);
+                onError(e);
+                throw e;
+            }
+        }
+
+        /**
+         * Translates received RPC message to {@link DeviceProviderService} method calls.
+         * @param msg DeviceProviderService message
+         */
+        private void onMethod(DeviceProviderServiceMsg msg) {
+            switch (msg.getMethodCase()) {
+            case REGISTER_PROVIDER:
+                RegisterProvider registerProvider = msg.getRegisterProvider();
+                // TODO Do we care about provider name?
+                pairedProvider.setProviderId(new ProviderId(registerProvider.getProviderScheme(), RPC_PROVIDER_NAME));
+                registeredProviders.add(pairedProvider);
+                deviceProviderService = deviceProviderRegistry.register(pairedProvider);
+                break;
+
+            case DEVICE_CONNECTED:
+                DeviceConnected deviceConnected = msg.getDeviceConnected();
+                deviceProviderService.deviceConnected(deviceId(deviceConnected.getDeviceId()),
+                                                      translate(deviceConnected.getDeviceDescription()));
+                break;
+            case DEVICE_DISCONNECTED:
+                DeviceDisconnected deviceDisconnected = msg.getDeviceDisconnected();
+                deviceProviderService.deviceDisconnected(deviceId(deviceDisconnected.getDeviceId()));
+                break;
+            case UPDATE_PORTS:
+                UpdatePorts updatePorts = msg.getUpdatePorts();
+                deviceProviderService.updatePorts(deviceId(updatePorts.getDeviceId()),
+                                                  updatePorts.getPortDescriptionsList()
+                                                      .stream()
+                                                          .map(GrpcDeviceUtils::translate)
+                                                          .collect(toList()));
+                break;
+            case PORT_STATUS_CHANGED:
+                PortStatusChanged portStatusChanged = msg.getPortStatusChanged();
+                deviceProviderService.portStatusChanged(deviceId(portStatusChanged.getDeviceId()),
+                                                        translate(portStatusChanged.getPortDescription()));
+                break;
+            case RECEIVED_ROLE_REPLY:
+                ReceivedRoleReply receivedRoleReply = msg.getReceivedRoleReply();
+                deviceProviderService.receivedRoleReply(deviceId(receivedRoleReply.getDeviceId()),
+                                                        translate(receivedRoleReply.getRequested()),
+                                                        translate(receivedRoleReply.getResponse()));
+                break;
+            case UPDATE_PORT_STATISTICS:
+                UpdatePortStatistics updatePortStatistics = msg.getUpdatePortStatistics();
+                deviceProviderService.updatePortStatistics(deviceId(updatePortStatistics.getDeviceId()),
+                                                           updatePortStatistics.getPortStatisticsList()
+                                                             .stream()
+                                                                .map(GrpcDeviceUtils::translate)
+                                                                .collect(toList()));
+                break;
+
+            // return value of DeviceProvider#isReachable
+            case IS_REACHABLE_RESPONSE:
+                IsReachableResponse isReachableResponse = msg.getIsReachableResponse();
+                int xid = isReachableResponse.getXid();
+                boolean isReachable = isReachableResponse.getIsReachable();
+                CompletableFuture<Boolean> result = outstandingIsReachable.asMap().remove(xid);
+                if (result != null) {
+                    result.complete(isReachable);
+                }
+                break;
+
+            case METHOD_NOT_SET:
+            default:
+                log.warn("Unexpected message received {}", msg);
+                break;
+            }
+        }
+
+        @Override
+        public void onCompleted() {
+            log.info("DeviceProviderServiceServerProxy completed");
+            deviceProviderRegistry.unregister(pairedProvider);
+            registeredProviders.remove(pairedProvider);
+            toDeviceProvider.onCompleted();
+        }
+
+        @Override
+        public void onError(Throwable e) {
+            log.error("DeviceProviderServiceServerProxy#onError", e);
+            deviceProviderRegistry.unregister(pairedProvider);
+            registeredProviders.remove(pairedProvider);
+            // TODO What is the proper clean up for bi-di stream on error?
+            // sample suggests no-op
+            toDeviceProvider.onError(e);
+        }
+
+
+        /**
+         * Registers Future for {@link DeviceProvider#isReachable(DeviceId)} return value.
+         * @param xid   IsReachable call ID.
+         * @param reply Future to
+         */
+        void register(int xid, CompletableFuture<Boolean> reply) {
+            outstandingIsReachable.put(xid, reply);
+        }
+
+    }
+
+    // Upper -> Lower Controller message
+    /**
+     * Relay DeviceProvider calls to RPC client.
+     */
+    private final class DeviceProviderServerProxy
+            implements DeviceProvider {
+
+        private final Logger log = LoggerFactory.getLogger(getClass());
+
+        // xid for isReachable calls
+        private final AtomicInteger xidPool = new AtomicInteger();
+        private final StreamObserver<DeviceProviderMsg> toDeviceProvider;
+
+        private DeviceProviderServiceServerProxy deviceProviderServiceProxy = null;
+        private ProviderId providerId;
+
+        DeviceProviderServerProxy(StreamObserver<DeviceProviderMsg> toDeviceProvider) {
+            this.toDeviceProvider = toDeviceProvider;
+        }
+
+        void setProviderId(ProviderId pid) {
+            this.providerId = pid;
+        }
+
+        /**
+         * Registers RPC stream in other direction.
+         * @param deviceProviderServiceProxy {@link DeviceProviderServiceServerProxy}
+         */
+        void pair(DeviceProviderServiceServerProxy deviceProviderServiceProxy) {
+            this.deviceProviderServiceProxy  = deviceProviderServiceProxy;
+        }
+
+        @Override
+        public void triggerProbe(DeviceId deviceId) {
+            log.trace("triggerProbe({})", deviceId);
+            DeviceProviderMsg.Builder msgBuilder = DeviceProviderMsg.newBuilder();
+            msgBuilder.setTriggerProbe(msgBuilder.getTriggerProbeBuilder()
+                                       .setDeviceId(deviceId.toString())
+                                       .build());
+            DeviceProviderMsg triggerProbeMsg = msgBuilder.build();
+            toDeviceProvider.onNext(triggerProbeMsg);
+            // TODO Catch Exceptions and call onError()
+        }
+
+        @Override
+        public void roleChanged(DeviceId deviceId, MastershipRole newRole) {
+            log.trace("roleChanged({}, {})", deviceId, newRole);
+            DeviceProviderMsg.Builder msgBuilder = DeviceProviderMsg.newBuilder();
+            msgBuilder.setRoleChanged(msgBuilder.getRoleChangedBuilder()
+                                          .setDeviceId(deviceId.toString())
+                                          .setNewRole(translate(newRole))
+                                          .build());
+            toDeviceProvider.onNext(msgBuilder.build());
+            // TODO Catch Exceptions and call onError()
+        }
+
+        @Override
+        public boolean isReachable(DeviceId deviceId) {
+            log.trace("isReachable({})", deviceId);
+            CompletableFuture<Boolean> result = new CompletableFuture<>();
+            final int xid = xidPool.incrementAndGet();
+
+            DeviceProviderMsg.Builder msgBuilder = DeviceProviderMsg.newBuilder();
+            msgBuilder.setIsReachableRequest(msgBuilder.getIsReachableRequestBuilder()
+                                                 .setXid(xid)
+                                                 .setDeviceId(deviceId.toString())
+                                                 .build());
+
+            // Associate xid and register above future some where
+            // in DeviceProviderService channel to receive reply
+            if (deviceProviderServiceProxy != null) {
+                deviceProviderServiceProxy.register(xid, result);
+            }
+
+            // send message down RPC
+            toDeviceProvider.onNext(msgBuilder.build());
+
+            // wait for reply
+            try {
+                return result.get(10, TimeUnit.SECONDS);
+            } catch (InterruptedException e) {
+                log.debug("isReachable({}) was Interrupted", deviceId, e);
+                Thread.currentThread().interrupt();
+            } catch (TimeoutException e) {
+                log.warn("isReachable({}) Timed out", deviceId, e);
+            } catch (ExecutionException e) {
+                log.error("isReachable({}) Execution failed", deviceId, e);
+                // close session?
+            }
+            return false;
+            // TODO Catch Exceptions and call onError()
+        }
+
+        @Override
+        public ProviderId id() {
+            return checkNotNull(providerId, "not initialized yet");
+        }
+
+    }
+}
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/package-info.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/package-info.java
new file mode 100644
index 0000000..d667ea7
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.
+ */
+
+/**
+ * gRPC based RemoteServiceProvider implementation.
+ */
+package org.onosproject.incubator.rpc.grpc;
diff --git a/incubator/rpc-grpc/src/main/proto/Device.proto b/incubator/rpc-grpc/src/main/proto/Device.proto
new file mode 100644
index 0000000..aae46d9
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/proto/Device.proto
@@ -0,0 +1,131 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc";
+
+import "Port.proto";
+package Device;
+
+enum DeviceType {
+  OTHER = 0;
+  SWITCH = 1;
+  ROUTER = 2;
+  ROADM = 3;
+  OTN = 4;
+  ROADM_OTN = 5;
+  FIREWALL = 6;
+  BALANCER = 7;
+  IPS = 8;
+  IDS = 9;
+  CONTROLLER = 10;
+  VIRTUAL = 11;
+  FIBER_SWITCH = 12;
+  MICROWAVE = 13;
+}
+
+message DeviceDescription {
+  string device_Uri = 1;
+  DeviceType type = 2;
+  string manufacturer = 3;
+  string hw_version = 4;
+  string sw_version = 5;
+  string serial_number = 6;
+  string chassis_id = 7;
+  map<string, string> annotations = 8;
+}
+
+enum MastershipRole {
+  NONE = 0;
+  MASTER = 1;
+  STANDBY = 2;
+}
+
+message DeviceConnected {
+  // DeviceID as String DeviceId#toString
+  string device_id = 1;
+  DeviceDescription device_description = 2;
+}
+
+message DeviceDisconnected {
+  // DeviceID as String DeviceId#toString
+  string device_id = 1;
+}
+
+message UpdatePorts {
+  // DeviceID as String DeviceId#toString
+  string device_id = 1;
+  repeated Port.PortDescription port_descriptions= 2;
+}
+
+message PortStatusChanged {
+  // DeviceID as String DeviceId#toString
+  string device_id = 1;
+  Port.PortDescription port_description= 2;
+}
+
+message ReceivedRoleReply {
+  // DeviceID as String DeviceId#toString
+  string device_id = 1;
+  MastershipRole requested = 2;
+  MastershipRole response = 3;
+}
+
+message UpdatePortStatistics {
+  // DeviceID as String DeviceId#toString
+  string device_id = 1;
+  repeated Port.PortStatistics port_statistics = 2;
+}
+
+message RegisterProvider {
+  // DeviceProvider's ProviderId scheme
+  string provider_scheme = 1;
+}
+
+message DeviceProviderServiceMsg {
+  oneof method {
+    DeviceConnected device_connected= 1;
+    DeviceDisconnected device_disconnected = 2;
+    UpdatePorts update_ports= 3;
+    PortStatusChanged port_status_changed = 4;
+    ReceivedRoleReply received_role_reply = 5;
+    UpdatePortStatistics update_port_statistics = 6;
+
+    // This message is for return value of DeviceProvider#isReachable
+    IsReachableResponse is_reachable_response = 7;
+
+    // This MUST be the 1st message over the stream
+    RegisterProvider register_provider = 8;
+  }
+}
+
+message TriggerProbe {
+  // DeviceID as String DeviceId#toString
+  string device_id = 1;
+}
+
+message RoleChanged {
+  // DeviceID as String DeviceId#toString
+  string device_id = 1;
+  MastershipRole new_role = 2;
+}
+
+message IsReachableRequest {
+  int32 xid = 1;
+  // DeviceID as String DeviceId#toString
+  string device_id = 2;
+}
+
+message IsReachableResponse {
+  int32 xid = 1;
+  bool is_reachable = 2;
+}
+
+message DeviceProviderMsg {
+  oneof method {
+    TriggerProbe trigger_probe = 1;
+    RoleChanged role_changed = 2;
+    IsReachableRequest is_reachable_request= 3;
+  }
+}
+
+service DeviceProviderRegistryRpc {
+  rpc Register(stream DeviceProviderServiceMsg) returns (stream DeviceProviderMsg);
+}
diff --git a/incubator/rpc-grpc/src/main/proto/Port.proto b/incubator/rpc-grpc/src/main/proto/Port.proto
new file mode 100644
index 0000000..f32193c
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/proto/Port.proto
@@ -0,0 +1,40 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc";
+
+package Port;
+
+enum PortType {
+  // Signifies copper-based connectivity.
+  COPPER = 0;
+  // Signifies optical fiber-based connectivity.
+  FIBER = 1;
+  // Signifies optical fiber-based packet port.
+  PACKET = 2;
+  // Signifies optical fiber-based optical tributary port (called T-port).
+  //The signal from the client side will be formed into a ITU G.709 (OTN) frame.
+  ODUCLT = 3;
+  // Signifies optical fiber-based Line-side port (called L-port).
+  OCH = 4;
+  // Signifies optical fiber-based WDM port (called W-port).
+  //Optical Multiplexing Section (See ITU G.709).
+  OMS = 5;
+  // Signifies virtual port.
+  VIRTUAL = 6;
+}
+
+// TODO What are we going to do with more specific PortDescription ...
+message PortDescription {
+  // PortNumber as String PortNumber#toString
+  string port_number = 1;
+  bool is_enabled = 2;
+  PortType type = 3;
+  int64 port_speed = 4;
+  map<string, string> annotations = 8;
+}
+
+message PortStatistics {
+  int32 port = 1;
+  int64 packets_received = 2;
+  int64 packets_sent = 3;
+  // TODO add all other fields
+}