diff --git a/incubator/rpc-grpc/src/main/proto/DeviceService.proto b/incubator/rpc-grpc/src/main/proto/DeviceService.proto
new file mode 100644
index 0000000..7ac8489
--- /dev/null
+++ b/incubator/rpc-grpc/src/main/proto/DeviceService.proto
@@ -0,0 +1,99 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc.net.device";
+
+import "Device.proto";
+import "Port.proto";
+
+package Device;
+
+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);
+}