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diff --git a/lib/fritz.py b/lib/fritz.py
new file mode 100644
index 00000000..6fd6f13a
--- /dev/null
+++ b/lib/fritz.py
@@ -0,0 +1,120 @@
+import xml.etree.ElementTree as ET
+import urllib.parse
+import urllib.request
+import time
+import hashlib
+import sys
+
+"""
+Example code Python3
+#!/usr/bin/env python3
+# vim: expandtab sw=4 ts=4
+
+FRITZ!OS WebGUI Login
+Get a sid (session ID) via PBKDF2 based challenge response algorithm. Fallback to MD5 if FRITZ!OS has no PBKDF2 support.
+AVM 2020-09-25
+"""
+
+LOGIN_SID_ROUTE = "/login_sid.lua?version=2"
+
+
+class LoginState:
+    def __init__(self, challenge: str, blocktime: int):
+        self.challenge = challenge
+        self.blocktime = blocktime
+        self.is_pbkdf2 = challenge.startswith("2$")
+
+
+def get_sid(box_url: str, username: str, password: str) -> str:
+    """ Get a sid by solving the PBKDF2 (or MD5) challenge-response process. """
+    try:
+        state = get_login_state(box_url)
+    except Exception as ex:
+        raise Exception("failed to get challenge") from ex
+    if state.is_pbkdf2:
+        print("PBKDF2 supported")
+        challenge_response = calculate_pbkdf2_response(
+            state.challenge, password)
+    else:
+        print("Falling back to MD5")
+        challenge_response = calculate_md5_response(state.challenge, password)
+    if state.blocktime > 0:
+        print(f"Waiting for {state.blocktime} seconds...")
+        time.sleep(state.blocktime)
+    try:
+        sid = send_response(box_url, username, challenge_response)
+    except Exception as ex:
+        raise Exception("failed to login") from ex
+    if sid == "0000000000000000":
+        raise Exception("wrong username or password")
+    return sid
+
+
+def get_login_state(box_url: str) -> LoginState:
+    """ Get login state from FRITZ!Box using login_sid.lua?version=2 """
+    url = box_url + LOGIN_SID_ROUTE
+    http_response = urllib.request.urlopen(url)
+    xml = ET.fromstring(http_response.read())
+    # print(f"xml: {xml}")
+    challenge = xml.find("Challenge").text
+    blocktime = int(xml.find("BlockTime").text)
+    return LoginState(challenge, blocktime)
+
+
+def calculate_pbkdf2_response(challenge: str, password: str) -> str:
+    """ Calculate the response for a given challenge via PBKDF2 """
+    challenge_parts = challenge.split("$")
+    # Extract all necessary values encoded into the challenge
+    iter1 = int(challenge_parts[1])
+    salt1 = bytes.fromhex(challenge_parts[2])
+    iter2 = int(challenge_parts[3])
+    salt2 = bytes.fromhex(challenge_parts[4])
+    # Hash twice, once with static salt...
+    # Once with dynamic salt.
+    hash1 = hashlib.pbkdf2_hmac("sha256", password.encode(), salt1, iter1)
+    hash2 = hashlib.pbkdf2_hmac("sha256", hash1, salt2, iter2)
+    return f"{challenge_parts[4]}${hash2.hex()}"
+
+
+def calculate_md5_response(challenge: str, password: str) -> str:
+    """ Calculate the response for a challenge using legacy MD5 """
+    response = challenge + "-" + password
+    # the legacy response needs utf_16_le encoding
+    response = response.encode("utf_16_le")
+    md5_sum = hashlib.md5()
+    md5_sum.update(response)
+    response = challenge + "-" + md5_sum.hexdigest()
+    return response
+
+
+def send_response(box_url: str, username: str, challenge_response: str) -> str:
+    """ Send the response and return the parsed sid. raises an Exception on error """
+    # Build response params
+    post_data_dict = {"username": username, "response": challenge_response}
+    post_data = urllib.parse.urlencode(post_data_dict).encode()
+    headers = {"Content-Type": "application/x-www-form-urlencoded"}
+    url = box_url + LOGIN_SID_ROUTE
+    # Send response
+    http_request = urllib.request.Request(url, post_data, headers)
+    http_response = urllib.request.urlopen(http_request)
+    # Parse SID from resulting XML.
+    xml = ET.fromstring(http_response.read())
+    return xml.find("SID").text
+
+
+def main():
+    if len(sys.argv) < 4:
+        print(
+            f"Usage: {sys.argv[0]} http://fritz.box user pass"
+        )
+        exit(1)
+    url = sys.argv[1]
+    username = sys.argv[2]
+    password = sys.argv[3]
+    sid = get_sid(url, username, password)
+    print(f"Successful login for user: {username}")
+    print(f"sid: {sid}")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/main.js b/main.js
index a2d5424b..396f92ad 100644
--- a/main.js
+++ b/main.js
@@ -51,8 +51,8 @@ var fritzTimeout;
 512 = ON_OFF
 513 = LEVEL_CTRL
 514 = COLOR_CTRL 
-516 = ? detected with blinds
-517 = ? detected with blinds
+516 = ? detected with blinds, different alert?
+517 = ? detected with blinds, different alerttimestamp
 772 = SIMPLE_BUTTON 
 1024 = SUOTA-Update
 */
@@ -1734,6 +1734,7 @@ function main() {
 			},
 			native: {}
 		});
+		adapter.setState(typ + newId + '.blindsopen', { val: false, ack: true }); //Button auf Ausgangszustand
 		adapter.setObjectNotExists(typ + newId + '.blindsclose', {
 			type: 'state',
 			common: {
@@ -1746,6 +1747,7 @@ function main() {
 			},
 			native: {}
 		});
+		adapter.setState(typ + newId + '.blindsclose', { val: false, ack: true }); //Button auf Ausgangszustand
 		adapter.setObjectNotExists(typ + newId + '.blindsstop', {
 			type: 'state',
 			common: {
@@ -1758,6 +1760,7 @@ function main() {
 			},
 			native: {}
 		});
+		adapter.setState(typ + newId + '.blindsstop', { val: false, ack: true }); //Button auf Ausgangszustand
 	}
 
 	function createDevices() {
diff --git a/test/lib/fritzserver.js b/test/lib/fritzserver.js
index a558a83b..065df0d7 100644
--- a/test/lib/fritzserver.js
+++ b/test/lib/fritzserver.js
@@ -56,7 +56,7 @@ function handleHttpRequest(request, response) {
 				'</Challenge><BlockTime>0</BlockTime><Rights></Rights></SessionInfo>'
 		);
 		response.end();
-	} else if (request.url == '/login_sid.lua?version=2') {
+	} else if (request.url == '/login_sid.lua?version=2' && request.method == 'GET') {
 		//check the URL of the current request
 		response.writeHead(200, { 'Content-Type': 'application/xml' });
 		response.write(
@@ -85,7 +85,7 @@ function handleHttpRequest(request, response) {
 				'</Challenge><BlockTime>0</BlockTime><Rights><Name>Dial</Name><Access>2</Access><Name>App</Name><Access>2</Access><Name>HomeAuto</Name><Access>2</Access><Name>BoxAdmin</Name><Access>2</Access><Name>Phone</Name><Access>2</Access><Name>NAS</Name><Access>2</Access></Rights></SessionInfo>'
 		);
 		response.end();
-	} else if (request.url == '/login_sid.lua?version=2?username=admin&response=' + challengeResponse) {
+	} else if (request.url == '/login_sid.lua?version=2' && request.method == 'POST') {
 		//check the URL of the current request
 		response.writeHead(200, { 'Content-Type': 'application/xml' });
 		response.write(