gatt battery level query example

git-svn-id: http://btstack.googlecode.com/svn/trunk@2820 1a0a8af8-31b5-11de-8e0c-53a27eea117e
number of freed packets sanitized number of completed

git-svn-id: http://btstack.googlecode.com/svn/trunk@2821 1a0a8af8-31b5-11de-8e0c-53a27eea117e