diff --git a/README.md b/README.md
index 4da93f9..3f10e0b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,22 @@
 # mac_watcher
 
-Scrap the MAC table from HP ProCurve switch and altert if a untrusted MAC is found.
\ No newline at end of file
+Scrape the MAC table from HP ProCurve switch and altert if a untrusted MAC is found.
+
+
+## Overview ##
+Scrape all known MAC addresses via snmp from a HP ProCurve switch.
+If a reported MAC is not i a white list, a alert is sent via email.
+
+
+## Install ##
+
+- `pip install mac-vendor-lookup`
+- `cd /opt/`
+- `git clone https://git.mosad.xyz/localhorst/mac_watcher.git`
+- `cd /opt/mac_watcher/`
+- Set the constants in `config.py`
+- `chmod +x /opt/mac_watcher/mac_watcher.py` 
+- `cp scripts/mac-watcher.service /etc/systemd/system/mac-watcher.service`
+- `systemctl daemon-reload && systemctl enable --now mac-watcher.service`
+
+
diff --git a/config.py b/config.py
new file mode 100644
index 0000000..7826577
--- /dev/null
+++ b/config.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+""" Author:                     Hendrik Schutter, mail@hendrikschutter.com
+    Date of creation:           2023/02/26
+    Date of last modification:  2023/02/26
+"""
+
+#   switch
+switch_ip_addr = "10.0.0.2"
+switch_snmp_community = "public"
+
+# email
+mail_server_domain = 'smtp.maildomain.dev'
+mail_server_port = 587
+mail_server_password = "__PW_DB__"
+mail_from_address = "sender@domain.com"
+mail_from_name = "MAC-Watcher"
+mail_to_address = "dummy@example.com"
+mail_to_name = "Joe Doe"
+
+# trusted macs
+trusted_mac_addresses = [
+"00:EE:00:EE:40:EE", #Router
+"00:EE:C2:EE:82:EE", #Smartphone
+]
+
+
+
diff --git a/mac_watcher.py b/mac_watcher.py
new file mode 100644
index 0000000..d582fd0
--- /dev/null
+++ b/mac_watcher.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+""" Author:                     Hendrik Schutter, mail@hendrikschutter.com
+    Date of creation:           2023/02/26
+    Date of last modification:  2023/02/26
+"""
+
+from subprocess import PIPE, Popen
+from mac_vendor_lookup import MacLookup
+import smtplib
+import email.utils
+from email.mime.text import MIMEText
+import time
+import config
+
+def send_alert_mail(mac_addr):
+    server = smtplib.SMTP(config.mail_server_domain, config.mail_server_port)
+    server.starttls()
+    server.login(config.mail_from_address, config.mail_server_password)
+
+    try:
+        mac_vendor = MacLookup().lookup(mac_addr)
+    except:
+        mac_vendor = " Vendor not found"
+
+    timeLong = time.strftime("%d.%m.%Y %H:%M:%S")
+    body = "Hallo Admin,\n\nneue MAC-Adresse gefunden!\n\nDatum: "+ timeLong + "\nMAC: " + str(mac_addr) +"\nVendor: " + mac_vendor + "\n\nVersion: 1.0 - 26.02.2023"
+    msg = MIMEText(body)
+    msg['Subject'] = 'New MAC found: ' + str(mac_addr) + " - " + mac_vendor
+    msg['To'] = email.utils.formataddr((config.mail_to_name, config.mail_to_address ))
+    msg['From'] = email.utils.formataddr((config.mail_from_name, config.mail_from_address))
+
+    server.sendmail(config.mail_from_address, config.mail_to_address , msg.as_string())
+    server.quit()
+
+def query_mac_from_switch():
+    mac_addresses = list()
+    command = "snmpwalk -v 2c -O vqe -c " + config.switch_snmp_community + " " + config.switch_ip_addr + " 1.3.6.1.2.1.17.4.3.1.1"
+    with Popen(command, stdout=PIPE, stderr=None, shell=True) as process:
+        output = process.communicate()[0].decode("utf-8")
+        for mac in output.split("\n"):
+            mac = mac.replace(" ", ":")
+            mac = mac.replace('"', "")
+            mac = mac[0:-1]
+            if(len(mac) == 17):
+                mac_addresses.append(mac)
+    return mac_addresses
+
+def watch():
+
+    alerted_mac_addresses = list()
+
+    while(True):
+        mac_addresses = query_mac_from_switch()
+        for mac_address in mac_addresses:
+            if mac_address not in config.trusted_mac_addresses:
+                if mac_address not in alerted_mac_addresses:
+                    alerted_mac_addresses.append(mac_address)
+                    send_alert_mail(mac_address)
+        time.sleep(10)
+
+if __name__ == "__main__":
+
+    print("updating MAC vendors ...")
+    MacLookup().update_vendors()
+    print("update done\n")
+
+    try:
+        watch()
+    except:
+        pass
+    
+            
\ No newline at end of file
diff --git a/scripts/mac-watcher.service b/scripts/mac-watcher.service
new file mode 100644
index 0000000..70243d7
--- /dev/null
+++ b/scripts/mac-watcher.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=MAC-Watcher
+After=syslog.target
+After=network.target
+
+[Service]
+RestartSec=2s
+Type=oneshot
+User=root
+Group=root
+WorkingDirectory=/home/hendrik/git/mac_watcher/
+ExecStart=/usr/bin/python3 /opt/mac_watcher/mac_watcher.py
+
+[Install]
+WantedBy=multi-user.target