first steps for pulling display functionality out of the client

client-barcode/display.py

@@ -0,0 +1,25 @@
+import serial
+
+class Display:
+	def __init__(self,portname="/dev/ttyUSB0"):
+		#code here
+		self.serialport=None
+		self.open_port(portname)
+
+	def __del__(self):
+		if (not self.serialport == None):
+			self.serialport.close()
+			self.serialport=None
+
+	def open_port(self,portname):
+		self.serialport = serial.Serial(portname,9600,timeout=2,rtscts=True, dsrdtr=True)
+		self.reset_display()
+		self.send("Hello world")
+
+
+	def reset_display(self):
+		print ("Initializing display on port %s\n" % self.serialport )
+		#code here
+
+	def send(self,text):
+		self.serialport.write(text)	

client-barcode/freitagskasse.py

@@ -20,9 +20,11 @@ import time
 import urllib2
 import select
 
+from display import Display
 from thread import start_new_thread, allocate_lock
 import time
 
+myDisplay=None
 
 COLOR_HINT = Fore.YELLOW + Style.BRIGHT
 COLOR_ERROR = Fore.RED
@@ -576,6 +578,11 @@ def main():
 	colorama.init()
 	status = Status()
 	global scroll_line1,scroll_line2
+	global myDisplay
+
+	myDisplay = Display("/dev/ttyUSB0")
+	myDisplay.reset_display()
+
 	print_display("\x1b\x40\x1f\x43\x00")
 	start_new_thread(display_thread,(1,))