update mqttd program, add buzzer control and test ok

Guo Wenxue

2019-08-03 415fe8988e579c3185c7ba074733859506c1c7c3

 modules/python/sht20.py

old mode 100644
new mode 100755
@@ -1,4 +1,6 @@
#!/usr/bin/python
#-*- coding: utf-8 -*-

import fcntl
import time
import unittest