From 5da1a5a8c3ad42f1c74108db3a92889b16e40d17 Mon Sep 17 00:00:00 2001
From: Brendan Haines <brendan.haines@gmail.com>
Date: Wed, 8 Apr 2020 15:58:22 -0600
Subject: [PATCH] prevent starting controller multiple times

---
 Software/python/server.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/Software/python/server.py b/Software/python/server.py
index 9352c19..3b541f7 100644
--- a/Software/python/server.py
+++ b/Software/python/server.py
@@ -201,10 +201,13 @@ def cal_black(attrname=None, old=None, new=None):
 def start_controller(attrname=None, old=None, new=None):
     global control_thread
     global control_thread_run
-    control_thread_run = True
-    control_thread = threading.Thread(target=controller)
-    control_thread.daemon = True
-    control_thread.start()
+    if control_thread_run:
+        print("ERROR: controller already running")
+    else:
+        control_thread_run = True
+        control_thread = threading.Thread(target=controller)
+        control_thread.daemon = True
+        control_thread.start()
 
 def stop_controller(attrname=None, old=None, new=None):
     global control_thread