diff --git a/cold-redundancy/util.hpp b/cold-redundancy/util.hpp
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+++ b/cold-redundancy/util.hpp
@@ -0,0 +1,59 @@
+/*
+// Copyright (c) 2019 Intel Corporation
+//
+// 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.
+*/
+
+#pragma once
+#include <boost/container/flat_map.hpp>
+#include <chrono>
+#include <cstdint>
+#include <iostream>
+#include <sdbusplus/asio/connection.hpp>
+
+namespace CR
+{
+
+using BasicVariantType =
+    std::variant<std::vector<std::string>, std::vector<uint64_t>,
+                 std::vector<uint8_t>, std::string, int64_t, uint64_t, double,
+                 int32_t, uint32_t, int16_t, uint16_t, uint8_t, bool>;
+
+using PropertyMapType =
+    boost::container::flat_map<std::string, BasicVariantType>;
+
+using GetSubTreeType = std::vector<
+    std::pair<std::string,
+              std::vector<std::pair<std::string, std::vector<std::string>>>>>;
+
+constexpr std::chrono::microseconds dbusTimeout(5000);
+static std::string psuEventPath = "/xyz/openbmc_project/State/Decorator/";
+
+enum class PSUState
+{
+    normal,
+    acLost
+};
+
+/**
+ * Getting PSU Event from PSU D-Bus interfaces
+ *
+ * @param[in] dbusConnection - D-Bus connection
+ * @param[in] psuName - PSU name such as "PSU1"
+ * @param[out] state - PSU state, normal or acLost
+ */
+void getPSUEvent(
+    const std::shared_ptr<sdbusplus::asio::connection>& dbusConnection,
+    const std::string& psuName, PSUState& state);
+
+} // namespace CR