diff --git a/Makefile b/Makefile
index b5619d4..eeaa5cd 100644
--- a/Makefile
+++ b/Makefile
@@ -59,6 +59,7 @@ LIB_INCLUDE_DIRS += src/goose
 LIB_INCLUDE_DIRS += src/sampled_values
 LIB_INCLUDE_DIRS += src/iec61850/inc
 LIB_INCLUDE_DIRS += src/iec61850/inc_private
+LIB_INCLUDE_DIRS += src/logging
 ifeq ($(HAL_IMPL), WIN32)
 LIB_INCLUDE_DIRS += third_party/winpcap/Include
 endif
@@ -100,6 +101,7 @@ LIB_API_HEADER_FILES += src/goose/goose_receiver.h
 LIB_API_HEADER_FILES += src/goose/goose_publisher.h
 LIB_API_HEADER_FILES += src/sampled_values/sv_subscriber.h
 LIB_API_HEADER_FILES += src/sampled_values/sv_publisher.h
+LIB_API_HEADER_FILES += src/logging/logging_api.h
 
 get_sources_from_directory  = $(wildcard $1/*.c)
 get_sources = $(foreach dir, $1, $(call get_sources_from_directory,$(dir)))
diff --git a/examples/mms_utility/mms_utility.c b/examples/mms_utility/mms_utility.c
index d34172d..3e22b24 100644
--- a/examples/mms_utility/mms_utility.c
+++ b/examples/mms_utility/mms_utility.c
@@ -172,7 +172,7 @@ int main(int argc, char** argv) {
                 printf("  read journal...\n");
              //   MmsConnection_readJournal(con, &error, domainName, name);
 
-#if 1
+#if 0
                 uint64_t timestamp = Hal_getTimeInMs();
 
                 MmsValue* startTime = MmsValue_newBinaryTime(false);
@@ -184,7 +184,7 @@ int main(int argc, char** argv) {
                 MmsConnection_readJournalTimeRange(con, &error, domainName, name, startTime, endTime);
 #endif
 
-#if 0
+#if 1
                 uint64_t timestamp = Hal_getTimeInMs();
 
                 MmsValue* startTime = MmsValue_newBinaryTime(false);
diff --git a/make/stack_includes.mk b/make/stack_includes.mk
index 3ddcc44..f1afbeb 100644
--- a/make/stack_includes.mk
+++ b/make/stack_includes.mk
@@ -8,3 +8,4 @@ INCLUDES += -I$(LIBIEC_HOME)/src/iec61850/inc_private
 INCLUDES += -I$(LIBIEC_HOME)/src/hal/inc
 INCLUDES += -I$(LIBIEC_HOME)/src/goose
 INCLUDES += -I$(LIBIEC_HOME)/src/sampled_values
+INCLUDES += -I$(LIBIEC_HOME)/src/logging
diff --git a/src/iec61850/inc/iec61850_common.h b/src/iec61850/inc/iec61850_common.h
index 938c9d1..929074a 100644
--- a/src/iec61850/inc/iec61850_common.h
+++ b/src/iec61850/inc/iec61850_common.h
@@ -30,6 +30,7 @@ extern "C" {
 
 
 #include "libiec61850_common_api.h"
+#include "logging_api.h"
 
 /**
  * @defgroup iec61850_common_api_group IEC 61850 API common parts
diff --git a/src/iec61850/inc/iec61850_model.h b/src/iec61850/inc/iec61850_model.h
index 961e640..969b35d 100644
--- a/src/iec61850/inc/iec61850_model.h
+++ b/src/iec61850/inc/iec61850_model.h
@@ -517,6 +517,9 @@ LogicalNode_hasUnbufferedReports(LogicalNode* node);
 DataSet*
 LogicalNode_getDataSet(LogicalNode* self, const char* dataSetName);
 
+void
+LogicalNode_setLogStorage(LogicalNode* self, const char* logName, LogStorage logStorage);
+
 bool
 DataObject_hasFCData(DataObject* dataObject, FunctionalConstraint fc);
 
diff --git a/src/iec61850/inc/iec61850_server.h b/src/iec61850/inc/iec61850_server.h
index 0c9f7ca..338f76b 100644
--- a/src/iec61850/inc/iec61850_server.h
+++ b/src/iec61850/inc/iec61850_server.h
@@ -650,6 +650,9 @@ IedServer_updateQuality(IedServer self, DataAttribute* dataAttribute, Quality qu
 /**@}*/
 
 
+void
+IedServer_setLogStorage(IedServer self, const char* logRef, LogStorage logStorage);
+
 /**
  * @defgroup IEC61850_SERVER_SETTING_GROUPS Server side setting group handling
  *
diff --git a/src/iec61850/inc_private/logging.h b/src/iec61850/inc_private/logging.h
index 2846323..70b36f8 100644
--- a/src/iec61850/inc_private/logging.h
+++ b/src/iec61850/inc_private/logging.h
@@ -25,6 +25,13 @@
 #ifndef LIBIEC61850_SRC_IEC61850_INC_PRIVATE_LOGGING_H_
 #define LIBIEC61850_SRC_IEC61850_INC_PRIVATE_LOGGING_H_
 
+typedef struct {
+    char* name;
+    LogicalNode* parentLN;
+
+    LogStorage logStorage;
+} LogInstance;
+
 typedef struct {
     char* name;
     LogControlBlock* logControlBlock;
@@ -39,6 +46,7 @@ typedef struct {
     MmsValue* mmsValue;
     MmsVariableSpecification* mmsType;
 
+    LogInstance* logInstance;
 
     bool enabled;
 
@@ -46,12 +54,22 @@ typedef struct {
 
 } LogControl;
 
+
+LogInstance*
+LogInstance_create(LogicalNode* parentLN, const char* name);
+
+void
+LogInstance_destroy(LogInstance* self);
+
 LogControl*
 LogControl_create(LogicalNode* parentLN, MmsMapping* mmsMapping);
 
 void
 LogControl_destroy(LogControl* self);
 
+void
+LogControl_setLogStorage(LogControl* self, LogStorage logStorage);
+
 MmsVariableSpecification*
 Logging_createLCBs(MmsMapping* self, MmsDomain* domain, LogicalNode* logicalNode,
         int lcbCount);
diff --git a/src/iec61850/inc_private/mms_mapping_internal.h b/src/iec61850/inc_private/mms_mapping_internal.h
index 8266079..b5c193e 100644
--- a/src/iec61850/inc_private/mms_mapping_internal.h
+++ b/src/iec61850/inc_private/mms_mapping_internal.h
@@ -37,6 +37,7 @@ struct sMmsMapping {
 
 #if (CONFIG_IEC61850_LOG_SERVICE == 1)
     LinkedList logControls;
+    LinkedList logInstances;
 #endif
 
 #if (CONFIG_INCLUDE_GOOSE_SUPPORT == 1)
diff --git a/src/iec61850/server/impl/ied_server.c b/src/iec61850/server/impl/ied_server.c
index d7e4027..5a2a467 100644
--- a/src/iec61850/server/impl/ied_server.c
+++ b/src/iec61850/server/impl/ied_server.c
@@ -1244,6 +1244,14 @@ IedServer_setEditSettingGroupConfirmationHandler(IedServer self, SettingGroupCon
 #endif
 }
 
+void
+IedServer_setLogStorage(IedServer self, const char* logRef, LogStorage logStorage)
+{
+#if (CONFIG_IEC61850_LOG_SERVICE == 1)
+    MmsMapping_setLogStorage(self->mmsMapping, logRef, logStorage);
+#endif
+}
+
 ClientConnection
 private_IedServer_getClientConnectionByHandle(IedServer self, void* serverConnectionHandle)
 {
diff --git a/src/iec61850/server/mms_mapping/logging.c b/src/iec61850/server/mms_mapping/logging.c
index 8a07a52..cdef07f 100644
--- a/src/iec61850/server/mms_mapping/logging.c
+++ b/src/iec61850/server/mms_mapping/logging.c
@@ -36,6 +36,26 @@
 #include "mms_value_internal.h"
 
 
+LogInstance*
+LogInstance_create(LogicalNode* parentLN, const char* name)
+{
+    LogInstance* self = (LogInstance*) GLOBAL_MALLOC(sizeof(LogInstance));
+
+
+    self->name = copyString(name);
+    self->parentLN = parentLN;
+    self->logStorage = NULL;
+
+    return self;
+}
+
+void
+LogInstance_destroy(LogInstance* self)
+{
+    GLOBAL_FREEMEM(self->name);
+    GLOBAL_FREEMEM(self);
+}
+
 LogControl*
 LogControl_create(LogicalNode* parentLN, MmsMapping* mmsMapping)
 {
@@ -47,6 +67,7 @@ LogControl_create(LogicalNode* parentLN, MmsMapping* mmsMapping)
     self->logicalNode = parentLN;
     self->mmsMapping = mmsMapping;
     self->dataSetRef = NULL;
+    self->logInstance = NULL;
 
     return self;
 }
@@ -59,6 +80,12 @@ LogControl_destroy(LogControl* self)
     }
 }
 
+void
+LogControl_setLog(LogControl* self, LogInstance* logInstance)
+{
+    self->logInstance = logInstance;
+}
+
 static LogControlBlock*
 getLCBForLogicalNodeWithIndex(MmsMapping* self, LogicalNode* logicalNode, int index)
 {
@@ -337,7 +364,86 @@ createLogControlBlock(LogControlBlock* logControlBlock,
     return lcb;
 }
 
+static LogInstance*
+getLogInstanceByLogRef(MmsMapping* self, const char* logRef)
+{
+    char refStr[130];
+    char* domainName;
+    char* lnName;
+    char* logName;
 
+    strncpy(refStr, logRef, 129);
+
+    printf("getLogInst... %s\n", refStr);
+
+    domainName = refStr;
+
+    lnName = strchr(refStr, '/');
+
+    if (lnName == NULL)
+        return NULL;
+
+    if ((lnName - domainName) > 64)
+        return NULL;
+
+    lnName[0] = 0;
+    lnName++;
+
+    logName = strchr(lnName, '$');
+
+    if (logName == NULL)
+        return NULL;
+
+    logName[0] = 0;
+    logName++;
+
+    printf("LOG: dn: %s ln: %s name: %s\n", domainName, lnName, logName);
+
+    LinkedList instance = LinkedList_getNext(self->logInstances);
+
+    while (instance != NULL) {
+
+        LogInstance* logInstance = LinkedList_getData(instance);
+
+        printf("logInstance: %s\n", logInstance->name);
+
+        if (strcmp(logInstance->name, logName) == 0) {
+            printf ("  lnName: %s\n", logInstance->parentLN->name);
+
+            if (strcmp(lnName, logInstance->parentLN->name) == 0) {
+                LogicalDevice* ld = (LogicalDevice*) logInstance->parentLN->parent;
+
+                printf("  ldName: %s\n", ld->name);
+
+                if (strcmp(ld->name, domainName) == 0)
+                    return logInstance;
+            }
+        }
+
+        instance = LinkedList_getNext(instance);
+    }
+
+    return NULL;
+}
+
+static LogInstance*
+getLogInstance(MmsMapping* self, LogicalNode* logicalNode, const char* logName)
+{
+    LinkedList logInstance = LinkedList_getNext(self->logInstances);
+
+    while (logInstance != NULL) {
+        LogInstance* instance = (LogInstance*) LinkedList_getData(logInstance);
+
+        printf("LOG: %s (%s)\n", instance->name, logName);
+
+        if ((strcmp(instance->name, logName) == 0) && (logicalNode == instance->parentLN))
+            return instance;
+
+        logInstance = LinkedList_getNext(logInstance);
+    }
+
+    return NULL;
+}
 
 MmsVariableSpecification*
 Logging_createLCBs(MmsMapping* self, MmsDomain* domain, LogicalNode* logicalNode,
@@ -366,6 +472,9 @@ Logging_createLCBs(MmsMapping* self, MmsDomain* domain, LogicalNode* logicalNode
         namedVariable->typeSpec.structure.elements[currentLcb] =
                 createLogControlBlock(logControlBlock, logControl);
 
+        //getLogInstanceByLogRef(self, logControlBlock->logRef);
+        logControl->logInstance = getLogInstance(self, logicalNode, logControlBlock->logRef);
+
         LinkedList_add(self->logControls, logControl);
 
         currentLcb++;
@@ -374,4 +483,15 @@ Logging_createLCBs(MmsMapping* self, MmsDomain* domain, LogicalNode* logicalNode
     return namedVariable;
 }
 
+void
+MmsMapping_setLogStorage(MmsMapping* self, const char* logRef, LogStorage logStorage)
+{
+    LogInstance* logInstance = getLogInstanceByLogRef(self, logRef);
 
+    if (logInstance != NULL)
+        logInstance->logStorage = logStorage;
+
+    //if (DEBUG_IED_SERVER)
+        if (logInstance == NULL)
+            printf("IED_SERVER: MmsMapping_setLogStorage no matching log for %s found!\n", logRef);
+}
diff --git a/src/iec61850/server/mms_mapping/mms_mapping.c b/src/iec61850/server/mms_mapping/mms_mapping.c
index 30a1fb5..ae7d351 100644
--- a/src/iec61850/server/mms_mapping/mms_mapping.c
+++ b/src/iec61850/server/mms_mapping/mms_mapping.c
@@ -1118,6 +1118,12 @@ createMmsDomainFromIedDevice(MmsMapping* self, LogicalDevice* logicalDevice)
 
         MmsDomain_addJournal(domain, log->name);
 
+        printf("log->name: %s\n", log->name);
+
+        LogInstance* logInstance = LogInstance_create(log->parent, log->name);
+
+        LinkedList_add(self->logInstances, (void*) logInstance);
+
         log = log->sibling;
     }
 #endif /* (CONFIG_IEC61850_LOG_SERVICE == 1) */
@@ -1248,6 +1254,7 @@ MmsMapping_create(IedModel* model)
 
 #if (CONFIG_IEC61850_LOG_SERVICE == 1)
     self->logControls = LinkedList_create();
+    self->logInstances = LinkedList_create();
 #endif
 
 #if (CONFIG_INCLUDE_GOOSE_SUPPORT == 1)
@@ -1311,6 +1318,11 @@ MmsMapping_destroy(MmsMapping* self)
     LinkedList_destroy(self->settingGroups);
 #endif
 
+#if (CONFIG_IEC61850_LOG_SERVICE == 1)
+    LinkedList_destroyDeep(self->logControls, (LinkedListValueDeleteFunction) LogControl_destroy);
+    LinkedList_destroyDeep(self->logInstances, (LinkedListValueDeleteFunction) LogInstance_destroy);
+#endif
+
     LinkedList_destroy(self->observedObjects);
 
     LinkedList_destroy(self->attributeAccessHandlers);
@@ -2512,7 +2524,7 @@ MmsMapping_setConnectionIndicationHandler(MmsMapping* self, IedConnectionIndicat
     self->connectionIndicationHandlerParameter = parameter;
 }
 
-#if ((CONFIG_IEC61850_REPORT_SERVICE == 1) || (CONFIG_INCLUDE_GOOSE_SUPPORT == 1))
+
 
 static bool
 isMemberValueRecursive(MmsValue* container, MmsValue* value)
@@ -2540,6 +2552,8 @@ isMemberValueRecursive(MmsValue* container, MmsValue* value)
     return isMemberValue;
 }
 
+#if ((CONFIG_IEC61850_REPORT_SERVICE == 1) || (CONFIG_INCLUDE_GOOSE_SUPPORT == 1))
+
 static bool
 DataSet_isMemberValue(DataSet* dataSet, MmsValue* value, int* index)
 {
@@ -2569,6 +2583,38 @@ DataSet_isMemberValue(DataSet* dataSet, MmsValue* value, int* index)
 }
 #endif /* ((CONFIG_IEC61850_REPORT_SERVICE == 1) || (CONFIG_INCLUDE_GOOSE_SUPPORT)) */
 
+#if (CONFIG_IEC61850_LOG_SERVICE == 1)
+
+static bool
+DataSet_isMemberValueWithRef(DataSet* dataSet, MmsValue* value, char* dataRef)
+{
+    int i = 0;
+
+     DataSetEntry* dataSetEntry = dataSet->fcdas;
+
+     while (dataSetEntry != NULL) {
+
+         MmsValue* dataSetValue = dataSetEntry->value;
+
+         if (dataSetValue != NULL) { /* prevent invalid data set members */
+             if (isMemberValueRecursive(dataSetValue, value)) {
+                 if (dataRef != NULL)
+                     sprintf(dataRef, "%s/%s", dataSetEntry->logicalDeviceName, dataSetEntry->variableName);
+
+                 return true;
+             }
+         }
+
+         i++;
+
+         dataSetEntry = dataSetEntry->sibling;
+     }
+
+     return false;
+}
+
+#endif /* (CONFIG_IEC61850_LOG_SERVICE == 1) */
+
 #if (CONFIG_IEC61850_REPORT_SERVICE == 1)
 void
 MmsMapping_triggerReportObservers(MmsMapping* self, MmsValue* value, ReportInclusionFlag flag)
@@ -2622,9 +2668,6 @@ MmsMapping_triggerLogging(MmsMapping* self, MmsValue* value, LogInclusionFlag fl
 
         if ((lc->enabled) && (lc->dataSet != NULL)) {
 
-
-            int index;
-
             switch (flag) {
 
             case LOG_CONTROL_VALUE_UPDATE:
@@ -2650,8 +2693,32 @@ MmsMapping_triggerLogging(MmsMapping* self, MmsValue* value, LogInclusionFlag fl
                 continue;
             }
 
-            if (DataSet_isMemberValue(lc->dataSet, value, &index)) {
-                printf("Log value - flag:%i\n", flag);
+            char dataRef[130];
+
+            if (DataSet_isMemberValueWithRef(lc->dataSet, value, dataRef)) {
+                printf("Log value - dataRef: %s flag: %i\n", dataRef, flag);
+
+                //TODO log to logInstance
+
+                if (lc->logInstance != NULL) {
+
+                    LogStorage logStorage = lc->logInstance->logStorage;
+
+                    if (logStorage != NULL) {
+
+                        uint64_t entryID = LogStorage_addEntry(logStorage, Hal_getTimeInMs());
+
+                        int dataSize = MmsValue_encodeMmsData(value, NULL, 0, false);
+
+                        uint8_t* data = GLOBAL_MALLOC(dataSize);
+
+                        MmsValue_encodeMmsData(value, data, 0, true);
+
+                        LogStorage_addEntryData(logStorage, entryID, dataRef, data, dataSize, flag);
+
+
+                    }
+                }
             }
 
 
diff --git a/src/iec61850/server/model/model.c b/src/iec61850/server/model/model.c
index 9b96b70..b6ced89 100644
--- a/src/iec61850/server/model/model.c
+++ b/src/iec61850/server/model/model.c
@@ -372,7 +372,7 @@ LogicalNode_hasFCData(LogicalNode* node, FunctionalConstraint fc)
 DataSet*
 LogicalNode_getDataSet(LogicalNode* self, const char* dataSetName)
 {
-	assert(self->modelType == LogicalNodeModelType);
+    assert(self->modelType == LogicalNodeModelType);
 	assert(dataSetName != NULL);
 
 	char dsName[66];
@@ -409,6 +409,20 @@ exit_error:
 	return NULL;
 }
 
+
+void
+LogicalNode_setLogStorage(LogicalNode* self, const char* logName, LogStorage logStorage)
+{
+    assert(self->modelType == LogicalNodeModelType);
+    assert(logName != NULL);
+
+    LogicalDevice* ld = (LogicalDevice*) self->parent;
+
+    IedModel* iedModel = (IedModel*) ld->parent;
+
+
+}
+
 int
 LogicalDevice_getLogicalNodeCount(LogicalDevice* logicalDevice)
 {
diff --git a/src/logging/log_storage_sqlite.c b/src/logging/log_storage_sqlite.c
deleted file mode 100644
index df76632..0000000
--- a/src/logging/log_storage_sqlite.c
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- *  log_storage_sqlite.c
- *
- */
-
-
-#include "logging_api.h"
-
-
-static bool
-SqLiteLogStorage_initializeLog(const char* logName, int logSize);
-
-static bool
-SqLiteLogStorage_storeEntry(const char* logName, uint64_t entryID, MmsValue* timestamp,
-        int entrySize, uint8_t* entryData);
-
-static bool
-SqLiteLogStorage_getEntries(const char* logName, MmsValue* timestamp,
-        LogEntryCallback callback, void* parameter);
-
-static bool
-SqLiteLogStorage_getEntriesAfter(const char* logName, MmsValue* timestamp, uint64_t entryID,
-        LogEntryCallback callback, void* parameter);
-
-static struct sLogStorage logStorageInstance = {
-        SqLiteLogStorage_initializeLog,
-        SqLiteLogStorage_storeEntry,
-        SqLiteLogStorage_getEntries,
-        SqLiteLogStorage_getEntriesAfter
-};
-
-LogStorage
-SqLiteStorage_createInstance()
-{
-    return &logStorageInstance;
-}
-
-static bool
-SqLiteLogStorage_initializeLog(const char* logName, int logSize)
-{
-    return true;
-}
-
-static bool
-SqLiteLogStorage_storeEntry(const char* logName, uint64_t entryID, MmsValue* timestamp,
-        int entrySize, uint8_t* entryData)
-{
-    return true;
-}
-
-static bool
-SqLiteLogStorage_getEntries(const char* logName, MmsValue* timestamp,
-        LogEntryCallback callback, void* parameter)
-{
-    return true;
-}
-
-static bool
-SqLiteLogStorage_getEntriesAfter(const char* logName, MmsValue* timestamp, uint64_t entryID,
-        LogEntryCallback callback, void* parameter)
-{
-    return true;
-}
-
-
-
-
diff --git a/src/logging/logging_api.h b/src/logging/logging_api.h
index deb0a9c..575e590 100644
--- a/src/logging/logging_api.h
+++ b/src/logging/logging_api.h
@@ -1,6 +1,24 @@
 /*
- * logging_api.h
+ *  logging_api.h
  *
+ *  Copyright 2016 Michael Zillgith
+ *
+ *  This file is part of libIEC61850.
+ *
+ *  libIEC61850 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  libIEC61850 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 libIEC61850.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  See COPYING file for the complete license text.
  */
 
 #ifndef LIBIEC61850_SRC_LOGGING_LOGGING_API_H_
@@ -8,24 +26,59 @@
 
 #include <stdint.h>
 #include <stdbool.h>
-#include "mms_value.h"
 
 typedef struct sLogStorage* LogStorage;
 
-typedef void (*LogEntryCallback) (void* parameter, MmsValue* timestamp, uint64_t entryID, int entrySize,
-        uint8_t* entryData);
+/**
+ *
+ * \param moreFollow - more data will follow - if false, the data is not valid
+ *
+ * \return true ready to receive new data, false abort operation
+ */
+typedef bool (*LogEntryCallback) (void* parameter, uint64_t timestamp, uint64_t entryID, bool moreFollow);
+
+typedef bool (*LogEntryDataCallback) (void* parameter, const char* dataRef, uint8_t* data, int dataSize, uint8_t reasonCode, bool moreFollow);
 
 struct sLogStorage {
-    bool (*initializeLog) (const char* logName, int logSize);
 
-    bool (*storeEntry) (const char* logName, uint64_t entryID, MmsValue* timestamp, int entrySize,
-            uint8_t* entryData);
+    void* instanceData;
 
-    bool (*getEntries) (const char* logName, MmsValue* timestamp,
-            LogEntryCallback callback, void* parameter);
+    LogEntryCallback entryCallback;
+    LogEntryDataCallback entryDataCallback;
 
-    bool (*getEntriesAfter) (const char* logName, MmsValue* timestamp, uint64_t entryID,
-            LogEntryCallback callback, void* parameter);
+    void* callbackParameter;
+
+    // bool (*initializeLog) (const char* logName, int logSize);
+
+    uint64_t (*addEntry) (LogStorage self, uint64_t timestamp);
+
+    bool (*addEntryData) (LogStorage self, uint64_t entryID, const char* dataRef, uint8_t* data, int dataSize, uint8_t reasonCode);
+
+    bool (*getEntries) (LogStorage self, uint64_t startingTime, uint64_t endingTime);
+
+    bool (*getEntriesAfter) (LogStorage self, uint64_t startingTime, uint64_t entryID);
+
+    void (*destroy) (LogStorage self);
 };
 
+
+
+uint64_t
+LogStorage_addEntry(LogStorage self, uint64_t timestamp);
+
+bool
+LogStorage_addEntryData(LogStorage self, uint64_t entryID, const char* dataRef, uint8_t* data, int dataSize, uint8_t reasonCode);
+
+bool
+LogStorage_getEntries(LogStorage self, uint64_t startingTime, uint64_t endingTime);
+
+bool
+LogStorage_getEntriesAfter(LogStorage self, uint64_t startingTime, uint64_t entryID);
+
+void
+LogStorage_setCallbacks(LogStorage self, LogEntryCallback entryCallback, LogEntryDataCallback entryDataCallback, void* callbackParameter);
+
+void
+LogStorage_destroy(LogStorage self);
+
 #endif /* LIBIEC61850_SRC_LOGGING_LOGGING_API_H_ */
diff --git a/src/mms/iso_mms/server/mms_journal_service.c b/src/mms/iso_mms/server/mms_journal_service.c
index a9ef4ad..8b8843c 100644
--- a/src/mms/iso_mms/server/mms_journal_service.c
+++ b/src/mms/iso_mms/server/mms_journal_service.c
@@ -23,6 +23,7 @@
 
 #include "libiec61850_platform_includes.h"
 #include "mms_server_internal.h"
+#include "mms_value_internal.h"
 
 #if (MMS_JOURNAL_SERVICE == 1)
 
@@ -69,8 +70,21 @@ mmsServer_handleReadJournalRequest(
 
     char domainId[65];
     char logName[65];
+    char entryIdBuf[64]; /* maximum size of entry id is 64 bytes! */
+
+    MmsValue entrySpec;
+    entrySpec.type = MMS_OCTET_STRING;
+    entrySpec.value.octetString.buf = entryIdBuf;
+    entrySpec.value.octetString.maxSize = 64;
+
+    MmsValue rangeStart;
+    MmsValue rangeStop;
 
     bool hasNames = false;
+    bool hasRangeStartSpec = false;
+    bool hasRangeStopSpec = false;
+    bool hasTimeSpec = false;
+    bool hasEntrySpec = false;
 
     while (bufPos < maxBufPos) {
         uint8_t tag = requestBuffer[bufPos++];
@@ -85,7 +99,7 @@ mmsServer_handleReadJournalRequest(
 
         switch (tag) {
 
-        case 0xa0:
+        case 0xa0: /* journalName */
             {
 
                 uint8_t objectIdTag = requestBuffer[bufPos++];
@@ -93,7 +107,7 @@ mmsServer_handleReadJournalRequest(
 
                 switch (objectIdTag) {
                 case 0xa1: /* domain-specific */
-                    printf("  domain-specific-log\n");
+                    printf("domain-specific-log  \n");
 
                     if (!parseStringWithMaxLength(domainId, 64, requestBuffer, &bufPos, bufPos + length, invokeId, response)) {
                         return;
@@ -105,8 +119,9 @@ mmsServer_handleReadJournalRequest(
 
                     printf("  domain: %s log: %s\n", domainId, logName);
 
-                    break;
+                    hasNames = true;
 
+                    break;
 
                 default:
                     mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_UNRECOGNIZED_MODIFIER, response);
@@ -117,13 +132,142 @@ mmsServer_handleReadJournalRequest(
 
             break;
 
+        case 0xa1: /* rangeStartSpecification */
+            {
+                uint8_t subTag = requestBuffer[bufPos++];
+                bufPos = BerDecoder_decodeLength(requestBuffer, &length, bufPos, maxBufPos);
+
+                if (subTag != 0x80) {
+                    mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_UNRECOGNIZED_MODIFIER, response);
+                    return;
+                }
+
+
+                if ((length == 4) || (length == 6)) {
+
+                    rangeStart.type = MMS_BINARY_TIME;
+                    rangeStart.value.binaryTime.size = length;
+
+                    memcpy(rangeStart.value.binaryTime.buf, requestBuffer + bufPos, length);
+
+                    char stringBuf[100];
+                    MmsValue_printToBuffer(&rangeStart, stringBuf, 100);
+
+                    printf("rangeStartSpec: %s\n", stringBuf);
+
+                    hasRangeStartSpec = true;
+                }
+                else {
+                    mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_REQUEST_INVALID_ARGUMENT, response);
+                    return;
+                }
+
+                bufPos += length;
+            }
+
+            break;
+
+        case 0xa2: /* rangeStopSpecification */
+            {
+                uint8_t subTag = requestBuffer[bufPos++];
+                bufPos = BerDecoder_decodeLength(requestBuffer, &length, bufPos, maxBufPos);
+
+                if (subTag != 0x80) {
+                    mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_UNRECOGNIZED_MODIFIER, response);
+                    return;
+                }
+
+
+                if ((length == 4) || (length == 6)) {
+                    rangeStop.type = MMS_BINARY_TIME;
+                    rangeStop.value.binaryTime.size = length;
+
+                    memcpy(rangeStop.value.binaryTime.buf, requestBuffer + bufPos, length);
+
+                    char stringBuf[100];
+                    MmsValue_printToBuffer(&rangeStop, stringBuf, 100);
+
+                    printf("rangeStopSpec: %s\n", stringBuf);
+
+                    hasRangeStopSpec = true;
+                }
+                else {
+                    mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_REQUEST_INVALID_ARGUMENT, response);
+                    return;
+                }
+
+                bufPos += length;
+            }
+
+            break;
+
+        case 0xa5: /* entryToStartAfter */
+            {
+                printf("entryToStartAfter\n");
+                int maxSubBufPos = bufPos + length;
+
+                while (bufPos < maxSubBufPos) {
+                    uint8_t subTag = requestBuffer[bufPos++];
+                    bufPos = BerDecoder_decodeLength(requestBuffer, &length, bufPos, maxBufPos);
+
+                    switch (subTag) {
+                    case 0x80: /* timeSpecification */
+
+                        if ((length == 4) || (length == 6)) {
+                            rangeStart.type = MMS_BINARY_TIME;
+                            rangeStart.value.binaryTime.size = length;
+
+                            memcpy(rangeStart.value.binaryTime.buf, requestBuffer + bufPos, length);
+
+                            char stringBuf[100];
+                            MmsValue_printToBuffer(&rangeStart, stringBuf, 100);
+
+                            printf("timeSpecification: %s\n", stringBuf);
+
+                            hasRangeStopSpec = true;
+                        }
+                        else {
+                            mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_REQUEST_INVALID_ARGUMENT, response);
+                            return;
+                        }
+
+                        break;
+
+                    case 0x81: /* entrySpecification */
+
+                        if (length <= entrySpec.value.octetString.maxSize) {
+                            memcpy(entrySpec.value.octetString.buf, requestBuffer + bufPos, length);
+                            entrySpec.value.octetString.size = length;
+
+                            printf("EntrySpecification with size %i\n", length);
+
+                            hasEntrySpec = true;
+                        }
+                        else {
+                            mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_REQUEST_INVALID_ARGUMENT, response);
+                            return;
+                        }
+
+                        break;
+
+                    default:
+                        mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_UNRECOGNIZED_MODIFIER, response);
+                        return;
+                    }
+
+                    bufPos += length;
+                }
+
+            }
+            break;
+
         default:
             mmsServer_writeMmsRejectPdu(&invokeId, MMS_ERROR_REJECT_INVALID_PDU, response);
             return;
         }
-
-        bufPos += length;
     }
+
+    //TODO check if required fields are present
 }
 
 #endif /* (MMS_JOURNAL_SERVICE == 1) */