try alternate endpoint on failure

just switching endpoint on exception

simple user friendly fix

lednamebadge.py

@@ -573,10 +573,17 @@ or
                 pass
             dev.set_configuration()
             print("using [%s %s] bus=%d dev=%d" % (dev.manufacturer, dev.product, dev.bus, dev.address))
-            for i in range(int(len(buf) / 64)):
+            endpoint = 1
+            i = 0
+            while i < int(len(buf) / 64):
                 time.sleep(0.1)
-                dev.write(1, buf[i * 64:i * 64 + 64])
-
+                try:
+                    dev.write(endpoint, buf[i * 64:i * 64 + 64])
+                    i += 1
+                except ValueError:
+                    if endpoint == 1:
+                        endpoint = 2
+                        i = 0
 
 def split_to_ints(list_str):
     return [int(x) for x in re.split(r'[\s,]+', list_str)]