diff --git a/extensions/openpower-pels/data_interface.hpp b/extensions/openpower-pels/data_interface.hpp
new file mode 100644
index 0000000..34bb173
--- /dev/null
+++ b/extensions/openpower-pels/data_interface.hpp
@@ -0,0 +1,155 @@
+#pragma once
+
+#include <sdbusplus/bus.hpp>
+#include <sdbusplus/bus/match.hpp>
+
+namespace openpower
+{
+namespace pels
+{
+
+using DBusValue = sdbusplus::message::variant<std::string>;
+using DBusProperty = std::string;
+using DBusInterface = std::string;
+using DBusService = std::string;
+using DBusPath = std::string;
+using DBusInterfaceList = std::vector<DBusInterface>;
+using DBusPropertyMap = std::map<DBusProperty, DBusValue>;
+
+/**
+ * @class DataInterface
+ *
+ * An abstract interface class for gathering data about the system
+ * for use in PELs. Implemented this way to facilitate mocking.
+ */
+class DataInterfaceBase
+{
+  public:
+    DataInterfaceBase() = default;
+    virtual ~DataInterfaceBase() = default;
+    DataInterfaceBase(const DataInterfaceBase&) = default;
+    DataInterfaceBase& operator=(const DataInterfaceBase&) = default;
+    DataInterfaceBase(DataInterfaceBase&&) = default;
+    DataInterfaceBase& operator=(DataInterfaceBase&&) = default;
+
+    /**
+     * @brief Pure virtual for returning the MTM
+     *
+     * @return string - The machine Type/Model string
+     */
+    virtual std::string getMachineTypeModel() const = 0;
+
+    /**
+     * @brief Pure virtual for returning the machine SN
+     *
+     * @return string - The machine serial number
+     */
+    virtual std::string getMachineSerialNumber() const = 0;
+};
+
+/**
+ * @class DataInterface
+ *
+ * Concrete implementation of DataInterfaceBase.
+ */
+class DataInterface : public DataInterfaceBase
+{
+  public:
+    DataInterface() = delete;
+    ~DataInterface() = default;
+    DataInterface(const DataInterface&) = default;
+    DataInterface& operator=(const DataInterface&) = default;
+    DataInterface(DataInterface&&) = default;
+    DataInterface& operator=(DataInterface&&) = default;
+
+    /**
+     * @brief Constructor
+     *
+     * @param[in] bus - The sdbusplus bus object
+     */
+    explicit DataInterface(sdbusplus::bus::bus& bus);
+
+    /**
+     * @brief Returns the machine type/model value
+     *
+     * @return string - The machine Type/Model string
+     */
+    std::string getMachineTypeModel() const override
+    {
+        return _machineTypeModel;
+    }
+
+    /**
+     * @brief Returns the machine SN
+     *
+     * @return string - The machine serial number
+     */
+    std::string getMachineSerialNumber() const override
+    {
+        return _machineSerialNumber;
+    }
+
+  private:
+    /**
+     * @brief Reads the machine type/model and SN from D-Bus.
+     *
+     * Looks for them on the 'system' inventory object, and also
+     * places a properties changed watch on them to obtain any changes
+     * (or read them for the first time if the inventory isn't ready
+     * when this function runs.)
+     */
+    void readMTMS();
+
+    /**
+     * @brief Finds the D-Bus service name that hosts the
+     *        passed in path and interface.
+     *
+     * @param[in] objectPath - The D-Bus object path
+     * @param[in] interface - The D-Bus interface
+     */
+    DBusService getService(const std::string& objectPath,
+                           const std::string& interface);
+    /**
+     * @brief Wrapper for the 'GetAll' properties method call
+     *
+     * @param[in] service - The D-Bus service to call it on
+     * @param[in] objectPath - The D-Bus object path
+     * @param[in] interface - The interface to get the props on
+     *
+     * @return DBusPropertyMap - The property results
+     */
+    DBusPropertyMap getAllProperties(const std::string& service,
+                                     const std::string& objectPath,
+                                     const std::string& interface);
+
+    /**
+     * @brief The properties changed callback for the Asset iface
+     *        on the system inventory object.
+     *
+     * @param[in] msg - The sdbusplus message of the signal
+     */
+    void sysAssetPropChanged(sdbusplus::message::message& msg);
+
+    /**
+     * @brief The machine type-model.  Always kept up to date
+     */
+    std::string _machineTypeModel;
+
+    /**
+     * @brief The machine serial number.  Always kept up to date
+     */
+    std::string _machineSerialNumber;
+
+    /**
+     * @brief The match object for the system path's properties
+     */
+    std::unique_ptr<sdbusplus::bus::match_t> _sysInventoryPropMatch;
+
+    /**
+     * @brief The sdbusplus bus object for making D-Bus calls.
+     */
+    sdbusplus::bus::bus& _bus;
+};
+
+} // namespace pels
+} // namespace openpower