diff --git a/pEpLog.cc b/pEpLog.cc
new file mode 100644
index 0000000..ec6f80d
--- /dev/null
+++ b/pEpLog.cc
@@ -0,0 +1,86 @@
+#include "pEpLog.hh"
+#include <iostream> // cout and cerr
+#include <sstream> // for stringstream
+#include <pEp/pEpEngine.h> // for log_event()
+#include "Adapter.hh" // for session()
+
+namespace pEp {
+namespace Adapter {
+namespace pEpLog {
+
+std::mutex mtx;
+
+std::atomic_bool is_initialized{false};
+std::atomic_bool is_enabled{true};
+std::atomic_bool is_enabled_backend_pEpEngine{true};
+std::atomic_bool is_enabled_backend_cout{false};
+std::atomic_bool is_enabled_backend_cerr{false};
+
+
+void set_enabled(bool enabled) {
+    is_enabled.store(enabled);
+}
+
+bool get_enabled() {
+    return is_enabled.load();
+}
+
+void set_enabled_cout(bool enabled){
+    is_enabled_backend_cout.store(enabled);
+}
+
+bool get_enabled_cout(){
+    return is_enabled_backend_cout.load();
+}
+
+void set_enabled_cerr(bool enabled){
+    is_enabled_backend_cerr.store(enabled);
+}
+
+bool get_enabled_cerr(){
+    return is_enabled_backend_cerr.load();
+}
+
+void set_enabled_pEpEngine(bool enabled){
+    is_enabled_backend_pEpEngine.store(enabled);
+}
+
+bool get_enabled_pEpEngine(){
+    return is_enabled_backend_pEpEngine.load();
+}
+
+void log_pEpEngine(std::string &msg) {
+    if (!is_initialized.load()) {
+        ::config_service_log(pEp::Adapter::session(), true);
+        ::log_service(pEp::Adapter::session(), "pEpLog init", nullptr, nullptr, nullptr);
+        is_initialized.store(true);
+    }
+    ::log_service(pEp::Adapter::session(), msg.c_str(), nullptr, nullptr, nullptr);
+}
+
+void log_cout(std::string &msg) {
+    std::cout << msg << std::endl; //std::endl also flushes
+}
+
+void log_cerr(std::string &msg) {
+    std::cerr << msg << std::endl; //std::endl also flushes
+}
+
+void log(std::string msg) {
+    std::lock_guard<std::mutex> l(mtx);
+    if (is_enabled.load()) {
+        if (is_enabled_backend_cout.load()) {
+            log_cout(msg);
+        }
+        if (is_enabled_backend_cerr.load()) {
+            log_cerr(msg);
+        }
+        if (is_enabled_backend_pEpEngine.load()) {
+            log_pEpEngine(msg);
+        }
+    }
+}
+
+} // pEpLog
+} // Adapter
+} // pEp
diff --git a/pEpLog.hh b/pEpLog.hh
index 12937e1..e515db7 100644
--- a/pEpLog.hh
+++ b/pEpLog.hh
@@ -1,7 +1,71 @@
-// TODO: put into not yet existing libpEpAdapter_utils.h, to be across whole libpEpAdapter
+#ifndef LIBPEPADAPTER_PEPLOG_HH
+#define LIBPEPADAPTER_PEPLOG_HH
+
+#include <sstream>
+#include <thread>
+
+// pEpLog
+// ======
+// a "to be kept small and simple" logging unit.
+// featuring:
+// * pEpLog macro that will be eliminated in release-builds (-DNDEBUG=1)
+// * all functions thread safe (no interleave when logging from diff threads)
+// * logging backend: pEpEngine logging API (providing platform abstractions and portability)
+// * logging backend: cout
+// * logging backend: cerr
+// * runtime enabled/disabled switch (global)
+// * runtime enabled/disabled switch per backend
+//
+// You might want more and more features, but the feature-policy is very restrictive, and there is a
+// primary design goal to keep it simple, maintainable and portable.
+//
+// How to use:
+// include <pEpLog.hh>
+// use the macro pEpLog(msg) to do logging
+// use NDEBUG=1 to turn logging on/off at compile-time
+// use set_enabled(bool) to turn logging on/off at runtime
+// use set_enabled_<backend>(bool) to turn logging on/off per backend
+// All these functions are thread-safe
+//
+// Thats all there is to it.
+
 #ifdef NDEBUG
     #define pEpLog(msg)  do{}while(0)
 #else
-    #include <iostream>
-    #define pEpLog(msg) do{std::cerr << __FILE__ << "::" << __FUNCTION__ << " - " << msg << '\n';} while(0)
-#endif
\ No newline at end of file
+    #define pEpLog(msg) \
+    do {                \
+        std::stringstream msg_ss; \
+        msg_ss << std::this_thread::get_id() << " - " << __FILE__ << "::" << __FUNCTION__ << " - " << msg;                 \
+        pEp::Adapter::pEpLog::log(msg_ss.str()); \
+    } while(0)
+#endif // NDEBUG
+
+namespace pEp {
+namespace Adapter {
+namespace pEpLog {
+
+void log(std::string msg);
+
+void set_enabled(bool is_enabled);
+
+bool get_enabled();
+
+void set_enabled_cout(bool is_enabled);
+
+bool get_enabled_cout();
+
+void set_enabled_cerr(bool is_enabled);
+
+bool get_enabled_cerr();
+
+void set_enabled_pEpEngine(bool is_enabled);
+
+bool get_enabled_pEpEngine();
+
+} // pEpLog
+} // Adapter
+} // pEp
+
+
+#endif // LIBPEPADAPTER_PEPLOG_HH
+