Cross Reference: /system/bt/service/example/heart_rate

`Name`	`Date`	`Size`
Up to higher level directory
`constants.h`	05-Oct-2017	`1.5K`
`heart_rate_server.cc`	05-Oct-2017	`16.1K`
`heart_rate_server.h`	05-Oct-2017	`5.9K`
`server_main.cc`	05-Oct-2017	`5.1K`