diff --git a/CMakeSettings.json b/CMakeSettings.json
new file mode 100644
index 00000000..91f357d9
--- /dev/null
+++ b/CMakeSettings.json
@@ -0,0 +1,57 @@
+{
+  "configurations": [
+    {
+      "name": "x64-Debug",
+      "generator": "Ninja",
+      "configurationType": "Debug",
+      "inheritEnvironments": [ "clang_cl_x64" ],
+      "buildRoot": "${projectDir}\\out\\build\\${name}",
+      "installRoot": "${projectDir}\\out\\install\\${name}",
+      "cmakeCommandArgs": "",
+      "buildCommandArgs": "",
+      "ctestCommandArgs": "",
+      "variables": [
+        {
+          "name": "WITH_TLS",
+          "value": "False",
+          "type": "BOOL"
+        },
+        {
+          "name": "WITH_CLIENTS",
+          "value": "False",
+          "type": "BOOL"
+        },
+        {
+          "name": "WITH_WEBSOCKETS",
+          "value": "False",
+          "type": "BOOL"
+        },
+        {
+          "name": "WITH_THREADING",
+          "value": "False",
+          "type": "BOOL"
+        },
+        {
+          "name": "DOCUMENTATION",
+          "value": "False",
+          "type": "BOOL"
+        },
+        {
+          "name": "CJSON_DIR",
+          "value": "C:/Users/d.kuhn/Projekte/cJSON/",
+          "type": "STRING"
+        },
+        {
+          "name": "CJSON_INCLUDE_DIR",
+          "value": "C:/Users/d.kuhn/Projekte/cJSON/",
+          "type": "PATH"
+        },
+        {
+          "name": "CJSON_LIBRARY",
+          "value": "C:/Users/d.kuhn/Projekte/cJSON/cjson/out/build/x64-Debug/cjson.lib",
+          "type": "FILEPATH"
+        }
+      ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/config.mk b/config.mk
index 6e0139c1..bc9aeefe 100644
--- a/config.mk
+++ b/config.mk
@@ -67,7 +67,7 @@ WITH_SYSTEMD:=no
 WITH_SRV:=no
 
 # Build with websockets support on the broker.
-WITH_WEBSOCKETS:=no
+WITH_WEBSOCKETS:=yes
 
 # Use elliptic keys in broker
 WITH_EC:=yes
diff --git a/mosquitto.conf b/mosquitto.conf
index 10b0406e..6e5f7c69 100644
--- a/mosquitto.conf
+++ b/mosquitto.conf
@@ -902,3 +902,7 @@
 # given multiple times, all of the files from the first instance will be
 # processed before the next instance. See the man page for examples.
 #include_dir
+
+# plugin C:\Users\d.kuhn\Projekte\mosquitto\out\build\x64-Debug\plugins\payload-modification\mosquitto_payload_modification.dll
+
+plugin C:\Users\d.kuhn\Projekte\mosquitto\out\build\x64-Debug\plugins\wamo\wamo.dll
\ No newline at end of file
diff --git a/plugins/CMakeLists.txt b/plugins/CMakeLists.txt
index c9aa03df..e7469bcd 100644
--- a/plugins/CMakeLists.txt
+++ b/plugins/CMakeLists.txt
@@ -3,3 +3,4 @@ if(NOT WIN32)
 	add_subdirectory(message-timestamp)
 endif(NOT WIN32)
 add_subdirectory(payload-modification)
+add_subdirectory(wamo)
diff --git a/plugins/wamo/CMakeLists.txt b/plugins/wamo/CMakeLists.txt
new file mode 100644
index 00000000..470eb681
--- /dev/null
+++ b/plugins/wamo/CMakeLists.txt
@@ -0,0 +1,51 @@
+# include_directories(${mosquitto_SOURCE_DIR} ${mosquitto_SOURCE_DIR}/include
+# 			${OPENSSL_INCLUDE_DIR} ${STDBOOL_H_PATH} ${STDINT_H_PATH})
+# link_directories(${mosquitto_SOURCE_DIR})
+#
+# add_library(wamo MODULE wamo.c "json_help.c" "json_help.h")
+# set_target_properties(wamo PROPERTIES
+# 	POSITION_INDEPENDENT_CODE 1
+# )
+# set_target_properties(wamo PROPERTIES PREFIX "")
+# if(WIN32)
+#	 target_link_libraries(wamo mosquitto ${CJSON_LIBRARIES})
+# endif(WIN32)
+
+# Don't install, these are example plugins only.
+#install(TARGETS wamo RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}" LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
+
+
+if (CJSON_FOUND )
+	add_definitions("-DWITH_CJSON")
+
+	set( CLIENT_INC ${mosquitto_SOURCE_DIR} ${mosquitto_SOURCE_DIR}/include
+		${STDBOOL_H_PATH} ${STDINT_H_PATH} ${mosquitto_SOURCE_DIR}/deps 
+		${mosquitto_SOURCE_DIR}/src ${CJSON_INCLUDE_DIRS} )
+
+	set( CLIENT_DIR ${mosquitto_BINARY_DIR}/lib ${CJSON_DIR})
+
+	include_directories(${CLIENT_INC})
+	link_directories(${CLIENT_DIR} ${mosquitto_SOURCE_DIR})
+
+	add_library(wamo MODULE
+		json_help.c
+		json_help.h
+		wamo.c)
+
+	set_target_properties(wamo PROPERTIES
+		POSITION_INDEPENDENT_CODE 1
+	)
+	set_target_properties(wamo PROPERTIES PREFIX "")
+
+	target_link_libraries(wamo ${CJSON_LIBRARIES})
+	if(WIN32)
+		target_link_libraries(wamo mosquitto)
+		install(TARGETS wamo
+			DESTINATION "${CMAKE_INSTALL_BINDIR}")
+	else()
+		install(TARGETS wamo
+			RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+			LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
+	endif()
+
+endif()
diff --git a/plugins/wamo/Makefile b/plugins/wamo/Makefile
new file mode 100644
index 00000000..24beff4d
--- /dev/null
+++ b/plugins/wamo/Makefile
@@ -0,0 +1,53 @@
+include ../../config.mk
+
+.PHONY : all binary check clean reallyclean test install uninstall
+
+PLUGIN_NAME=wamo
+LOCAL_CPPFLAGS=-I../../src/ -DWITH_CJSON
+
+OBJS=	\
+		
+		json_help.o \
+		wamo.o 
+		
+
+ifeq ($(WITH_CJSON),yes)
+ALL_DEPS:= binary
+else
+ALL_DEPS:=
+endif
+else
+ALL_DEPS:=
+endif
+
+all : ${ALL_DEPS}
+binary : ${PLUGIN_NAME}.so
+
+${PLUGIN_NAME}.so : ${OBJS}
+	${CROSS_COMPILE}${CC} $(PLUGIN_LDFLAGS) -fPIC -shared $^ -o $@ -lcjson
+
+
+
+json_help.o : json_help.c 
+	${CROSS_COMPILE}${CC} $(LOCAL_CPPFLAGS) $(PLUGIN_CPPFLAGS) $(PLUGIN_CFLAGS) -c $< -o $@
+
+wamo.o : wamo.c 
+	${CROSS_COMPILE}${CC} $(LOCAL_CPPFLAGS) $(PLUGIN_CPPFLAGS) $(PLUGIN_CFLAGS) -c $< -o $@
+
+
+reallyclean : clean
+clean:
+	-rm -f *.o ${PLUGIN_NAME}.so *.gcda *.gcno
+
+check: test
+test:
+
+install: all
+ifeq ($(WITH_CJSON),yes)
+	$(INSTALL) -d "${DESTDIR}$(libdir)"
+	$(INSTALL) ${STRIP_OPTS} ${PLUGIN_NAME}.so "${DESTDIR}${libdir}/${PLUGIN_NAME}.so"
+endif
+endif
+
+uninstall :
+	-rm -f "${DESTDIR}${libdir}/${PLUGIN_NAME}.so"
diff --git a/plugins/wamo/json_help.c b/plugins/wamo/json_help.c
new file mode 100644
index 00000000..8c06a898
--- /dev/null
+++ b/plugins/wamo/json_help.c
@@ -0,0 +1,182 @@
+/*
+
+Contributors:
+   Dominik Kuhn - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <cjson/cJSON.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "json_help.h"
+#include "mosquitto.h"
+#include "mosquitto_broker.h"
+
+int json_create_array(cJSON* json, const char* name) {
+	cJSON* jtmp;
+
+	jtmp = cJSON_GetObjectItem(json, name);
+	if (jtmp) {
+		if (cJSON_IsArray(jtmp) == true) {
+			return MOSQ_ERR_INVAL;
+		}
+		else {
+			cJSON_AddArrayToObject(json, name);
+		}
+				
+	}
+	else {
+		cJSON_AddArrayToObject(json, name);
+	}
+
+	return MOSQ_ERR_SUCCESS;
+
+}
+
+int json_add_id_to_array(cJSON* json, const char* name, const char * id)
+{	
+	cJSON* jtmp;
+	cJSON* tid;
+
+	jtmp = cJSON_GetObjectItem(json, name);
+	if (jtmp) {
+		if (cJSON_IsArray(jtmp) == true) {
+			tid = cJSON_CreateString(id);
+			cJSON_AddItemToArray(jtmp, tid);
+		}
+		else {
+			return MOSQ_ERR_INVAL;
+		}
+
+	}
+	else {
+		return MOSQ_ERR_INVAL;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+
+}
+
+int json_del_id_from_array(cJSON* json, const char* name, const char* id)
+{
+	cJSON* jtmp = NULL;
+	cJSON* tid = NULL;
+	cJSON* detached_item = NULL;
+
+	int array_index = 0;
+
+	jtmp = cJSON_GetObjectItem(json, name);
+	if (jtmp) {
+		mosquitto_log_printf(MOSQ_LOG_INFO, "wamo: deleting item from array .. debug 1");
+		if (cJSON_IsArray(jtmp) == true) {
+			// cJSON_DeleteItemFromObject(json, name);
+			mosquitto_log_printf(MOSQ_LOG_INFO, "wamo: deleting item from array .. debug 2");
+			cJSON_ArrayForEach(tid, jtmp)
+			{	
+								
+				if ( strcmp( cJSON_GetStringValue(tid),id) == 0)
+				{
+					mosquitto_log_printf(MOSQ_LOG_INFO, "wamo: deleting item from array .. debug 3");
+					detached_item = cJSON_DetachItemFromArray(jtmp, array_index);
+						
+				}
+				else
+				{
+					mosquitto_log_printf(MOSQ_LOG_INFO, "wamo: deleting item from array .. debug 4");
+				}			
+				array_index++;
+			}
+			// cJSON_ReplaceItemInObject(json, name, jtmp);
+			// cJSON_AddItemToObject(json, id, jtmp);
+		}
+		else {
+			return MOSQ_ERR_INVAL;
+		}
+
+	}
+	else {
+		return MOSQ_ERR_INVAL;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+
+}
+
+int json_get_bool(cJSON *json, const char *name, bool *value, bool optional, bool default_value)
+{
+	cJSON *jtmp;
+
+	if(optional == true){
+		*value = default_value;
+	}
+
+	jtmp = cJSON_GetObjectItem(json, name);
+	if(jtmp){
+		if(cJSON_IsBool(jtmp) == false){
+			return MOSQ_ERR_INVAL;
+		}
+		*value = cJSON_IsTrue(jtmp);
+	}else{
+		if(optional == false){
+			return MOSQ_ERR_INVAL;
+		}
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int json_get_int(cJSON *json, const char *name, int *value, bool optional, int default_value)
+{
+	cJSON *jtmp;
+
+	if(optional == true){
+		*value = default_value;
+	}
+
+	jtmp = cJSON_GetObjectItem(json, name);
+	if(jtmp){
+		if(cJSON_IsNumber(jtmp) == false){
+			return MOSQ_ERR_INVAL;
+		}
+		*value  = jtmp->valueint;
+	}else{
+		if(optional == false){
+			return MOSQ_ERR_INVAL;
+		}
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+int json_get_string(cJSON *json, const char *name, char **value, bool optional)
+{
+	cJSON *jtmp;
+
+	*value = NULL;
+
+	jtmp = cJSON_GetObjectItem(json, name);
+	if(jtmp){
+		if(cJSON_IsString(jtmp) == false){
+			return MOSQ_ERR_INVAL;
+		}
+		*value  = jtmp->valuestring;
+	}else{
+		if(optional == false){
+			return MOSQ_ERR_INVAL;
+		}
+	}
+	return MOSQ_ERR_SUCCESS;
+}
+
+
+cJSON *cJSON_AddIntToObject(cJSON * const object, const char * const name, int number)
+{
+	char buf[30];
+
+	snprintf(buf, sizeof(buf), "%d", number);
+	return cJSON_AddRawToObject(object, name, buf);
+}
diff --git a/plugins/wamo/json_help.h b/plugins/wamo/json_help.h
new file mode 100644
index 00000000..f11eea3e
--- /dev/null
+++ b/plugins/wamo/json_help.h
@@ -0,0 +1,23 @@
+#ifndef JSON_HELP_H
+#define JSON_HELP_H
+/*
+
+Contributors:
+   Dominik Kuhn Light - initial implementation and documentation.
+*/
+#include <cjson/cJSON.h>
+#include <stdbool.h>
+
+int json_create_array(cJSON* json, const char* name);
+int json_add_id_to_array(cJSON* json, const char* name, const char* id);
+int json_del_id_from_array(cJSON* json, const char* name, const char* id);
+
+/* "optional==false" can also be taken to mean "only return success if the key exists and is valid" */
+int json_get_bool(cJSON *json, const char *name, bool *value, bool optional, bool default_value);
+int json_get_int(cJSON *json, const char *name, int *value, bool optional, int default_value);
+int json_get_string(cJSON *json, const char *name, char **value, bool optional);
+
+cJSON *cJSON_AddIntToObject(cJSON * const object, const char * const name, int number);
+cJSON *cJSON_CreateInt(int num);
+
+#endif
diff --git a/plugins/wamo/wamo.c b/plugins/wamo/wamo.c
new file mode 100644
index 00000000..a5740a04
--- /dev/null
+++ b/plugins/wamo/wamo.c
@@ -0,0 +1,167 @@
+/*
+Copyright (c) 2020 Roger Light <roger@atchoo.org>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License 2.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   https://www.eclipse.org/legal/epl-2.0/
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+
+/*
+ * This is an *example* plugin which demonstrates how to modify the payload of
+ * a message after it is received by the broker and before it is sent on to
+ * other clients.
+ *
+ * You should be very sure of what you are doing before making use of this feature.
+ *
+ * Compile with:
+ *   gcc -I<path to mosquitto-repo/include> -fPIC -shared mosquitto_payload_modification.c -o mosquitto_payload_modification.so
+ *
+ * Use in config with:
+ *
+ *   plugin /path/to/mosquitto_payload_modification.so
+ *
+ * Note that this only works on Mosquitto 2.0 or later.
+ */
+#include <stdio.h>
+#include <string.h>
+
+#include "mosquitto_broker.h"
+#include "mosquitto_plugin.h"
+#include "mosquitto.h"
+#include "mqtt_protocol.h"
+
+#include "json_help.h"
+
+#define UNUSED(A) (void)(A)
+
+static mosquitto_plugin_id_t* mosq_pid = NULL;
+static cJSON* subscribedTopics = NULL;
+
+static int callback_control(int event, void* event_data, void* userdata)
+{
+	struct mosquitto_evt_acl_check* ed = event_data;
+
+	UNUSED(event);
+	UNUSED(userdata);
+
+	const char * client_id = mosquitto_client_id(ed->client);
+	const char* topic = ed->topic;
+	const int access = ed->access;
+
+
+
+	if (access == MOSQ_ACL_SUBSCRIBE) {
+		json_create_array(subscribedTopics, topic);
+		json_add_id_to_array(subscribedTopics, topic, client_id);
+		char* json_string = cJSON_Print(subscribedTopics);
+		mosquitto_log_printf(MOSQ_LOG_INFO, "wamo: client with id %s subscribed to topic %s", client_id, topic);
+		mosquitto_log_printf(MOSQ_LOG_INFO, "wamo: subscribed topics %s", json_string);
+	}
+	else if (access == MOSQ_ACL_UNSUBSCRIBE) {
+		json_del_id_from_array(subscribedTopics, topic, client_id);
+		char* json_string = cJSON_Print(subscribedTopics);
+		mosquitto_log_printf(MOSQ_LOG_INFO, "wamo: client with id %s unscribed to topic %s", client_id, topic);
+		mosquitto_log_printf(MOSQ_LOG_INFO, "wamo: subscribed topics %s", json_string);
+	}
+
+
+
+	return MOSQ_ERR_SUCCESS; 
+}
+
+
+static int callback_message(int event, void* event_data, void* userdata)
+{
+	struct mosquitto_evt_message* ed = event_data;
+	char* new_payload;
+	uint32_t new_payloadlen;
+
+	UNUSED(event);
+	UNUSED(userdata);
+
+	/* This simply adds "hello " to the front of every payload. You can of
+	 * course do much more complicated message processing if needed. */
+
+	 /* Calculate the length of our new payload */
+	new_payloadlen = ed->payloadlen + (uint32_t)strlen("hello ") + 1;
+
+	/* Allocate some memory - use
+	 * mosquitto_calloc/mosquitto_malloc/mosquitto_strdup when allocating, to
+	 * allow the broker to track memory usage */
+	new_payload = mosquitto_calloc(1, new_payloadlen);
+	if (new_payload == NULL) {
+		return MOSQ_ERR_NOMEM;
+	}
+
+	/* Print "hello " to the payload */
+	snprintf(new_payload, new_payloadlen, "hello ");
+	memcpy(new_payload + (uint32_t)strlen("hello "), ed->payload, ed->payloadlen);
+
+	/* Assign the new payload and payloadlen to the event data structure. You
+	 * must *not* free the original payload, it will be handled by the
+	 * broker. */
+	ed->payload = new_payload;
+	ed->payloadlen = new_payloadlen;
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+int mosquitto_plugin_version(int supported_version_count, const int* supported_versions)
+{
+	int i;
+
+	for (i = 0; i < supported_version_count; i++) {
+		if (supported_versions[i] == 5) {
+			return 5;
+		}
+	}
+	return -1;
+}
+
+int mosquitto_plugin_init(mosquitto_plugin_id_t* identifier, void** user_data, struct mosquitto_opt* opts, int opt_count)
+{
+	int rc;
+
+	UNUSED(user_data);
+	
+	mosq_pid = identifier;
+
+	subscribedTopics = cJSON_CreateObject();
+
+	rc = mosquitto_callback_register(mosq_pid, MOSQ_EVT_ACL_CHECK, callback_control, NULL, NULL);
+	if (rc == MOSQ_ERR_ALREADY_EXISTS) {
+		mosquitto_log_printf(MOSQ_LOG_ERR, "Error: WaMo plugin can currently only be loaded once.");
+		mosquitto_log_printf(MOSQ_LOG_ERR, "Note that this was previously incorrectly allowed but could cause problems with duplicate entries in the config.");
+		return rc;
+	}
+	else if (rc == MOSQ_ERR_NOMEM) {
+		mosquitto_log_printf(MOSQ_LOG_ERR, "Error: Out of memory.");
+		return rc;
+	}
+	else if (rc != MOSQ_ERR_SUCCESS) {
+		return rc;
+	}
+
+	return MOSQ_ERR_SUCCESS;
+	
+
+}
+
+int mosquitto_plugin_cleanup(void* user_data, struct mosquitto_opt* opts, int opt_count)
+{
+	UNUSED(user_data);
+	UNUSED(opts);
+	UNUSED(opt_count);
+
+	return mosquitto_callback_unregister(mosq_pid, MOSQ_EVT_ACL_CHECK, callback_control, NULL);
+}