diff --git a/README.md b/README.md
index e69de29..57471ee 100644
--- a/README.md
+++ b/README.md
@@ -0,0 +1,5 @@
+# Rocket.Chat Notification Method
+
+This method can be used to send notification via Rocket.Chat.
+Configuration in WATO. You need to enter the URL including the token which is provided
+by Rocket.Chat upon creating the respective webhook.
diff --git a/rocketchat-notification-1.0.0.mkp b/rocketchat-notification-1.0.0.mkp
new file mode 100644
index 0000000..089c936
Binary files /dev/null and b/rocketchat-notification-1.0.0.mkp differ
diff --git a/src/info b/src/info
new file mode 100644
index 0000000..62cf996
--- /dev/null
+++ b/src/info
@@ -0,0 +1,11 @@
+{'author': 'Mark-Tim Junghanns',
+ 'description': 'Send notifications via Rocket.Chat',
+ 'download_url': 'https://git.php-xpert.de/mtj/Checkmk-rocketchat-notification/',
+ 'files': {'notifications': ['rocketchat'],
+           'web': ['plugins/wato/rocketchat.py']},
+ 'name': 'rocketchat-notification',
+ 'title': 'Rocket.Chat Notification Method',
+ 'version': '1.0.0',
+ 'version.min_required': '2.2.0p3',
+ 'version.packaged': '2.2.0p3',
+ 'version.usable_until': None}
diff --git a/src/notifications/rocketchat b/src/notifications/rocketchat
new file mode 100755
index 0000000..b6829c7
--- /dev/null
+++ b/src/notifications/rocketchat
@@ -0,0 +1,124 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# Rocketchat
+
+# SPDX-FileCopyrightText: 2013 Mathias Kettner <mk@mathias-kettner.de>
+# SPDX-FileCopyrightText: 2021 Stefan Gehn <stefan+cmk@srcbox.net>
+# SPDX-FileCopyrightText: 2023 Mark Junghanns <mark@markjunghanns.de>
+#
+# SPDX-License-Identifier: GPL-2.0-only
+
+# Rocket.Chat notification based on asciimail notification from check_mk 1.2.6p16.
+
+from __future__ import unicode_literals
+
+import sys
+import requests
+from cmk.notification_plugins import utils
+
+
+tmpl_host_text = """$HOSTSTATE_EMOJI$ `$HOSTNAME$`
+```
+Host:     $HOSTNAME$
+Event:    $EVENT_TXT$
+Output:   $HOSTOUTPUT$
+```"""
+
+tmpl_service_text = """$SERVICESTATE_EMOJI$ `$HOSTNAME$/$SERVICEDESC$`
+```
+Host:     $HOSTNAME$
+Service:  $SERVICEDESC$
+Event:    $EVENT_TXT$
+Output:   $SERVICEOUTPUT$
+```"""
+
+
+def hoststate_as_emoji(hoststate):
+    if hoststate == "UP":
+        return "\ud83d\udd35"  # large blue circle
+    elif hoststate == "DOWN":
+        return "\ud83d\udd34"  # large red circle
+    elif hoststate == "UNREACH":
+        return "\u26aa\ufe0f"  # medium white circle
+    return hoststate
+
+
+def servicestate_as_emoji(servicestate):
+    if servicestate == "OK":
+        return "\ud83c\udd97"  # squared ok
+    elif servicestate == "WARN":
+        return "\u26a0\ufe0f"  # warning sign
+    elif servicestate == "CRIT":
+        return "\u2757\ufe0f"  # heavy exclamation mark symbol
+    elif servicestate == "UNKN":
+        return "\u2754"  # white question mark ornament
+    return servicestate
+
+
+def construct_message_text(context):
+    context["HOSTSTATE_EMOJI"] = hoststate_as_emoji(context.get("HOSTSHORTSTATE", ""))
+    context["SERVICESTATE_EMOJI"] = servicestate_as_emoji(
+        context.get("SERVICESHORTSTATE", "")
+    )
+
+    notification_type = context["NOTIFICATIONTYPE"]
+    if notification_type in ["PROBLEM", "RECOVERY"]:
+        txt_info = "$PREVIOUS@HARDSHORTSTATE$ -> $@SHORTSTATE$"
+    elif notification_type.startswith("FLAP"):
+        if "START" in notification_type:
+            txt_info = "Started Flapping"
+        else:
+            txt_info = "Stopped Flapping ($@SHORTSTATE$)"
+    elif notification_type.startswith("DOWNTIME"):
+        what = notification_type[8:].title()
+        txt_info = "Downtime " + what + " ($@SHORTSTATE$)"
+    elif notification_type == "ACKNOWLEDGEMENT":
+        txt_info = "Acknowledged ($@SHORTSTATE$)"
+    elif notification_type == "CUSTOM":
+        txt_info = "Custom Notification ($@SHORTSTATE$)"
+    else:
+        txt_info = notification_type  # Should never happen
+
+    context["EVENT_TXT"] = utils.substitute_context(
+        txt_info.replace("@", context["WHAT"]), context
+    )
+
+    if context["WHAT"] == "HOST":
+        tmpl_text = tmpl_host_text
+    else:
+        tmpl_text = tmpl_service_text
+
+    return utils.substitute_context(tmpl_text, context)
+
+
+def send_rocketchat_message(webhook_url, text):
+    url = format(webhook_url)
+    json = {
+	"text": text,
+	}
+    
+    r = requests.post(url=url, json=json)
+
+    if r.status_code != 200:
+        sys.stderr.write(
+            "Failed to send Rocket.Chat message. Status: {}, Response: {}\n".format(
+                r.status_code, r.text
+            )
+        )
+        return 1  # Temporary error to make Checkmk retry
+
+    sys.stdout.write(
+        "Sent message to Rocket.Chat {}\n"
+    )
+    return 0
+
+
+def main():
+    context = utils.collect_context()
+    webhook_url = context["PARAMETER_WEBHOOK_URL"]
+    text = construct_message_text(context)
+    return send_rocketchat_message(webhook_url, text)
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/src/web/plugins/wato/rocketchat.py b/src/web/plugins/wato/rocketchat.py
new file mode 100644
index 0000000..ef34486
--- /dev/null
+++ b/src/web/plugins/wato/rocketchat.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# SPDX-FileCopyrightText: 2021 Stefan Gehn <stefan+cmk@srcbox.net>
+# SPDX-FileCopyrightText: 2023 Mark-Tim Junghanns <mark@markjunghanns.de>
+#
+# SPDX-License-Identifier: GPL-2.0-only
+
+from cmk.gui.valuespec import Dictionary, TextAscii
+from cmk.gui.plugins.wato import notification_parameter_registry, NotificationParameter
+
+
+@notification_parameter_registry.register
+class NotificationParameterRocketchat(NotificationParameter):
+    @property
+    def ident(self):
+        return "rocketchat"
+
+    @property
+    def spec(self):
+        return Dictionary(
+            title=_("Create notification with the following parameters"),
+            required_keys=["webhook_url"],
+            elements=[
+                (
+                    "webhook_url",
+                    TextAscii(
+                        title=_("Webhook URL"),
+                        help=_("Webhook URL des Monitoring Users"),
+                        size=146,
+                        allow_empty=False,
+                    ),
+                ),
+            ],
+        )