From 24cf5325a4350e94693f8ff0332dcb6a5841753c Mon Sep 17 00:00:00 2001
From: Hendrik Langer <hendrik+dev@xd0.de>
Date: Tue, 4 Aug 2020 13:54:30 +0200
Subject: [PATCH] fix serial cmd

---
 raspberry/roberto/Serial.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/raspberry/roberto/Serial.py b/raspberry/roberto/Serial.py
index 8de2b65..d47c62f 100644
--- a/raspberry/roberto/Serial.py
+++ b/raspberry/roberto/Serial.py
@@ -50,7 +50,7 @@ class Serial(object):
                     print(data)
                     command = data[0]
                     argument = data[2:].strip()
-                    if isalnum(command) and command in self._callbacks:
+                    if command.isalnum() and command in self._callbacks:
                         cb = self._callbacks[command]
                         if cb:
                             cb(argument)