fix do command

secop.py

@@ -137,7 +137,7 @@ class SecopInteractor(SecopClient):
             command = command[7:]
         elif command.startswith('do '):
             is_param = False
-            command = command[7:]
+            command = command[3:]
         modpar, _, strvalue = command.partition(' ')
         module, _, parameter = modpar.partition(':')
         if not parameter: