diff --git a/ChangeLog.md b/ChangeLog.md
index 5c33aca8..31668364 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -7,16 +7,19 @@
 * fix some compiler warnings
 * fix non-unique message keys in HTTP JSON output with "full" query parameter
 * fix for message after debian install
+* fix for replacing already existing message definitions
+* fix missing length in CSV dump for some data types
 
 ## Features
 * added DTM and BDZ data types
 * added "-n" argument to "hex" and "direct" commands for automatically determining message length from input
-* added level/pollprio/condition to HTTP JSON output
+* added level/pollprio/condition/field flags and field result type as well as list of types to HTTP JSON output
 * added message dump from commandline in JSON format
 * added support for newer MQTT broker versions
 * added some PIC calibration data to "ebuspicloader" verbose output
 * added support for upcoming adapter 3 firmware enhancements
 * added config override path
+* added support for adding message definition via HTTP port
 
 ## Breaking Changes
 * remove support for Debian 8 Jessie in docker
diff --git a/src/ebusd/mainloop.cpp b/src/ebusd/mainloop.cpp
index 4069f56b..70d74b16 100644
--- a/src/ebusd/mainloop.cpp
+++ b/src/ebusd/mainloop.cpp
@@ -2199,8 +2199,13 @@ result_t MainLoop::executeGet(const vector<string>& args, bool* connected, ostri
       *ostream << ",\n  \"reconnects\": " << m_reconnectCount
                << ",\n  \"masters\": " << m_busHandler->getMasterCount()
                << ",\n  \"messages\": " << m_messages->size()
-               << ",\n  \"lastup\": " << static_cast<unsigned>(maxLastUp)
-               << "\n }"
+               << ",\n  \"lastup\": " << static_cast<unsigned>(maxLastUp);
+      if (withDefinition) {
+        *ostream << ",\n  \"types\": [";
+        DataTypeList::getInstance()->dump(verbosity, true, ostream);
+        *ostream << "\n  ]";
+      }
+      *ostream << "\n }"
                << "\n}";
       type = 6;
     }
diff --git a/src/lib/ebus/datatype.cpp b/src/lib/ebus/datatype.cpp
index 65cecad1..ea172563 100755
--- a/src/lib/ebus/datatype.cpp
+++ b/src/lib/ebus/datatype.cpp
@@ -1116,6 +1116,31 @@ DataTypeList* DataTypeList::getInstance() {
   return &s_instance;
 }
 
+void DataTypeList::dump(OutputFormat outputFormat, bool appendDivisor, ostream* output) const {
+  bool json = outputFormat & OF_JSON;
+  string sep = "\n";
+  for (int withLength=0; withLength<2; withLength++) {
+    const map<string, const DataType*>* types = withLength==0 ? &m_typesById : &m_typesByIdLength;
+    for (const auto &it: *types) {
+      const DataType *dataType = it.second;
+      if (json) {
+        *output << sep << "    {";
+      }
+      if ((dataType->getBitCount() % 8) != 0) {
+        dataType->dump(outputFormat, dataType->getBitCount(), appendDivisor, output);
+      } else {
+        dataType->dump(outputFormat, dataType->getBitCount() / 8, appendDivisor, output);
+      }
+      if (json) {
+        *output << "}";
+        sep = ",\n";
+      } else {
+        *output << "\n";
+      }
+    }
+  }
+}
+
 void DataTypeList::clear() {
   for (auto& it : m_cleanupTypes) {
     delete it;
diff --git a/src/lib/ebus/datatype.h b/src/lib/ebus/datatype.h
index 2945d51a..92c32b89 100755
--- a/src/lib/ebus/datatype.h
+++ b/src/lib/ebus/datatype.h
@@ -575,6 +575,14 @@ class DataTypeList {
    */
   static DataTypeList* getInstance();
 
+  /**
+   * Dump the type list optionally including the divisor to the output.
+   * @param outputFormat the @a OutputFormat options.
+   * @param appendDivisor whether to append the divisor (if available).
+   * @param output the @a ostream to dump to.
+   */
+  void dump(OutputFormat outputFormat, bool appendDivisor, ostream* output) const;
+
   /**
    * Removes all @a DataType instances.
    */