remove cache

tests/device/main.go

@@ -6,7 +6,7 @@ import (
 )
 
 var (
-	testURL        = flag.String("url", "http://192.168.1.116:8088", "login url")
+	testURL        = flag.String("url", "http://192.168.1.173:8088", "login url")
 	testProductKey = flag.String("productkey", "2e397f5599a3f6f6a5a3c8fcd45437169501b3c6e239042ad5e9b65303561e41ab5519e9d205facbcbe75a2784354501", "product key")
 	testProtocol   = flag.String("protocol", "mqtt", "access protocol")
 )