Utils: fix python tty device detection (select the last dmesg entry)

utils/set_psu.py

@@ -4,11 +4,18 @@ import matplotlib.pyplot as plt
 import numpy as np
 import io, os
 
-tty_enum = os.popen('./get_tty_devs.sh').read().strip().split('\n')
-
-psu_tty_dev = '/dev/' + next((a for a in tty_enum if a.find('KORAD') > 0), '').split(':')[0]
-
-if psu_tty_dev != '/dev/':
+def find_tty_dev(dev_name):
+    tty_enum = os.popen('./get_tty_devs.sh').read().strip().split('\n')
+    # only keep the last entry that way
+    tty_dev = ''
+    for a in tty_enum:
+        if a.find(dev_name) > 0:
+            tty_dev = '/dev/' + a.split(':')[0]
+    return(tty_dev)
+
+psu_tty_dev = find_tty_dev('KORAD')
+
+if psu_tty_dev != '':
     print('found PSU TTY device: ' + psu_tty_dev)
 else:
     print('couldn\'t find PSU TTY device')