Use Python code to detect the correct serial port.

Dockerfile

@@ -2,11 +2,10 @@ FROM debian:bookworm
 MAINTAINER yohan <783b8c87@scimetis.net>
 ENV DEBIAN_FRONTEND noninteractive
 ENV TZ Europe/Paris
-RUN apt-get update && apt-get -y install gunicorn sqlite3 python3-pip python3-requests python3-yaml python3-flask python3-serial udev
+RUN apt-get update && apt-get -y install gunicorn sqlite3 python3-pip python3-requests python3-yaml python3-flask python3-serial
 ENV PIP_BREAK_SYSTEM_PACKAGES 1
 RUN pip install flask-restx==1.3.0
 WORKDIR /root
-COPY find_ttyUSB.sh /root/
 COPY relay.py /root/
 COPY thermostat.py /root/
 ENV FLASK_APP thermostat.py

find_ttyUSB.sh

@@ -1,10 +0,0 @@
-#!/bin/bash
-
-for sysdevpath in $(find /sys/bus/usb/devices/usb*/ -name dev); do
-    syspath="${sysdevpath%/dev}"
-    devname="$(udevadm info -q name -p $syspath)"
-    [[ "$devname" == "ttyUSB"* ]] || continue
-    eval "$(udevadm info -q property --export -p $syspath)"
-    [[ -z "$ID_SERIAL" ]] && exit
-    echo "/dev/$devname - $ID_SERIAL"
-done

relay.py

@@ -2,6 +2,7 @@
 # Pilotage GCE USB 8 Relay Board
 import time
 import serial
+import serial.tools.list_ports
 import argparse
 import sys
 import subprocess
@@ -34,17 +35,24 @@ else:
 
 #print(relays)
 
-find_ttyUSB_output = subprocess.check_output(["./find_ttyUSB.sh"])
+port = None
-device = None
-for line in find_ttyUSB_output.decode('utf-8').split("\n"):
-  if "FTDI_FT232R_USB_UART_A50285BI" in line:
-    device = line.split(" ")[0]
-    break
     
-if device is None:
+def list_serial_ports():
-  print ("Relay board not found.")
+    ports = serial.tools.list_ports.comports()
-  sys.exit(1)
+    for port, desc, hwid in sorted(ports):
+        print("{}: {} [{}]".format(port, desc, hwid))
 
+def find_serial_ports():
+    ports = serial.tools.list_ports.comports()
+    for port, desc, hwid in sorted(ports):
+        if "FT232R USB UART" in desc:
+            return port
+
+port = find_serial_ports()
+if port is None:
+    print("Unable to find serial port for relay board please use one of the following")
+    list_serial_ports()
+    sys.exit(2)
 
 def init_serial(pPort):         
   global ser          
@@ -67,7 +75,7 @@ def init_serial(pPort):
     print('Could not connect to ' + ser.portstr) 
     sys.exit(1)
 
-init_serial(device)
+init_serial(port)
 if action != 'status':
   for relay in relays:
     command = relay+action+'\r\n'