From 3b3d194916c8a39219c319311fcc7872dd16b53f Mon Sep 17 00:00:00 2001
From: Ollo <Ollo@host>
Date: Sun, 19 Apr 2026 14:02:13 +0200
Subject: [PATCH] Search serial device, if not provided

---
 mqttclient/fanATserial2mqtt.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/mqttclient/fanATserial2mqtt.py b/mqttclient/fanATserial2mqtt.py
index 644ac69..62ae8ef 100644
--- a/mqttclient/fanATserial2mqtt.py
+++ b/mqttclient/fanATserial2mqtt.py
@@ -18,7 +18,15 @@ COMMAND_PREFIX = "ollpe"
 mqtt_server=os.environ['MQTT_SERVER']
 mqtt_topic=os.environ['MQTT_TOPIC']
 # SERIAL Port
-serial_device=os.environ['SERIAL_DEVICE']
+try:
+    serial_device=os.environ['SERIAL_DEVICE']
+except (KeyError):
+    # search serial device
+    for root, dirs, files in os.walk("/dev/serial/by-id/"):
+        for name in files:
+            abspath=os.path.join(root, name)
+            serial_device=abspath
+
 
 # Logging
 try: