--- a
+++ b/src/ohservice.hxx
@@ -0,0 +1,49 @@
+/* Copyright (C) 2016 J.F.Dockes
+ *	 This program is free software; you can redistribute it and/or modify
+ *	 it under the terms of the GNU General Public License as published by
+ *	 the Free Software Foundation; either version 2 of the License, or
+ *	 (at your option) any later version.
+ *
+ *	 This program is distributed in the hope that it will be useful,
+ *	 but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	 GNU General Public License for more details.
+ *
+ *	 You should have received a copy of the GNU General Public License
+ *	 along with this program; if not, write to the
+ *	 Free Software Foundation, Inc.,
+ *	 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#ifndef _OHSERVICE_H_X_INCLUDED_
+#define _OHSERVICE_H_X_INCLUDED_
+
+#include <string>         
+#include <unordered_map>  
+#include <vector>         
+
+#include "libupnpp/device/device.hxx"
+#include "upmpd.hxx"
+
+using namespace UPnPP;
+
+// A parent class for all openhome service, to share a bit of state
+// variable and event management code.
+class OHService : public UPnPProvider::UpnpService {
+public:
+    OHService(const std::string& servtp, const std::string &servid, UpMpd *dev)
+        : UpnpService(servtp, servid, dev), m_dev(dev) {
+    }
+    virtual ~OHService() { }
+
+    // Implementation in upmpd.cxx
+    virtual bool getEventData(bool all, std::vector<std::string>& names, 
+                              std::vector<std::string>& values);
+
+protected:
+    virtual bool makestate(std::unordered_map<std::string, std::string> &) = 0;
+    // State variable storage
+    std::unordered_map<std::string, std::string> m_state;
+    UpMpd *m_dev;
+};
+
+#endif /* _OHSERVICE_H_X_INCLUDED_ */