these two go static

callback_dispatcher.cc

@@ -62,11 +62,11 @@ namespace pEp {
     void CallbackDispatcher::start_sync()
     {
         pEp::Adapter::startup<CallbackDispatcher>(CallbackDispatcher::messageToSend,
-                CallbackDispatcher::notifyHandshake, this,
+                CallbackDispatcher::notifyHandshake, &callback_dispatcher,
                 &CallbackDispatcher::on_startup,
                 &CallbackDispatcher::on_shutdown);
 
-        for (auto target : targets)
+        for (auto target : callback_dispatcher.targets)
             target.notifyHandshake(nullptr, nullptr, SYNC_NOTIFY_START);
     }
 
@@ -74,7 +74,7 @@ namespace pEp {
     {
         pEp::Adapter::shutdown();
 
-        for (auto target : targets)
+        for (auto target : callback_dispatcher.targets)
             target.notifyHandshake(nullptr, nullptr, SYNC_NOTIFY_STOP);
     }
 

callback_dispatcher.hh

@@ -34,8 +34,8 @@ namespace pEp {
             );
         void remove(::messageToSend_t messageToSend);
 
-        void start_sync();
+        static void start_sync();
-        void stop_sync();
+        static void stop_sync();
 
         static PEP_STATUS messageToSend(::message *msg);
         static PEP_STATUS notifyHandshake(::pEp_identity *me,