Implement flush function

gpio_handler/beerme.py

@@ -19,6 +19,7 @@ r_ch3 = 21
 # time constants in seconds
 t_large_beer = 5
 t_small_beer = 2
+t_flush = 20
 
 # Syntax suger because of negative logic
 S_ON = GPIO.LOW
@@ -48,6 +49,13 @@ def cli_args_parser():
             help="Test mode which tests all available channels"
     )
 
+    parser.add_argument(
+            '-f',
+            '--flush',
+            action='store_true',
+            help="Flush tap for 20s!"
+    )
+
     parser.add_argument(
             '-m',
             '--memo',
@@ -117,6 +125,9 @@ if __name__ == "__main__":
     if args.test:
         print("Test mode enabled")
         gpio_test()
+    elif args.flush:
+        print("Choice: Flush tap")
+        draw_beer(t_flush)
     elif args.products == "LARGE_BEER":
         print("Choice: Large beer")
         draw_beer(t_large_beer)