This example creates and updates a standard Battery Level service containing a single GATT characteristic with mbed OS 5.

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0:d9a87d1192f6
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+++ b/mbed-os.lib	Fri Jun 02 14:29:32 2017 +0000
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+https://github.com/ARMmbed/mbed-os/#42be5c01a7f91292d5e27124ad9584236025f6ab