You can communicate with the phone nrf heartrate utility in applications. Board is nrf51822EK_TM, development environment with keil5 line. Burning with nrfgo studio

ble_app_hrs\arm\ble_app_hrs.uvgui.Administrator
...........\...\ble_app_hrs.uvgui_Administrator.bak
...........\...\ble_app_hrs.uvopt
...........\...\ble_app_hrs.uvproj
...........\...\ble_app_hrs_nrf51822_xxaa_s110 (256K).dep
...........\...\ble_app_hrs_nrf51822_xxab_s110 (128K).dep
...........\...\_build\app_button.crf
...........\...\......\app_button.d
...........\...\......\app_button.o
...........\...\......\app_gpiote.crf
...........\...\......\app_gpiote.d
...........\...\......\app_gpiote.o
...........\...\......\app_timer.crf
...........\...\......\app_timer.d
...........\...\......\app_timer.o
...........\...\......\arm_startup_nrf51.d
...........\...\......\arm_startup_nrf51.lst
...........\...\......\arm_startup_nrf51.o
...........\...\......\battery.crf
...........\...\......\battery.d
...........\...\......\battery.o
...........\...\......\ble_advdata.crf
...........\...\......\ble_advdata.d
...........\...\......\ble_advdata.o
...........\...\......\ble_app_hrs.axf
...........\...\......\ble_app_hrs.build_log.htm
...........\...\......\ble_app_hrs.hex
...........\...\......\ble_app_hrs.htm
...........\...\......\ble_app_hrs.lnp
...........\...\......\ble_app_hrs.map
...........\...\......\ble_app_hrs.sct
...........\...\......\ble_app_hrs_sct.Bak
...........\...\......\ble_bas.crf
...........\...\......\ble_bas.d
...........\...\......\ble_bas.o
...........\...\......\ble_bondmngr.crf
...........\...\......\ble_bondmngr.d
...........\...\......\ble_bondmngr.o
...........\...\......\ble_conn_params.crf
...........\...\......\ble_conn_params.d
...........\...\......\ble_conn_params.o
...........\...\......\ble_debug_assert_handler.crf
...........\...\......\ble_debug_assert_handler.d
...........\...\......\ble_debug_assert_handler.o
...........\...\......\ble_dis.crf
...........\...\......\ble_dis.d
...........\...\......\ble_dis.o
...........\...\......\ble_error_log.crf
...........\...\......\ble_error_log.d
...........\...\......\ble_error_log.o
...........\...\......\ble_hrs.crf
...........\...\......\ble_hrs.d
...........\...\......\ble_hrs.o
...........\...\......\ble_srv_common.crf
...........\...\......\ble_srv_common.d
...........\...\......\ble_srv_common.o
...........\...\......\crc16.crf
...........\...\......\crc16.d
...........\...\......\crc16.o
...........\...\......\led.crf
...........\...\......\led.d
...........\...\......\led.o
...........\...\......\main.crf
...........\...\......\main.d
...........\...\......\main.o
...........\...\......\pstorage.crf
...........\...\......\pstorage.d
...........\...\......\pstorage.o
...........\...\......\softdevice_handler.crf
...........\...\......\softdevice_handler.d
...........\...\......\softdevice_handler.o
...........\...\......\system_nrf51.crf
...........\...\......\system_nrf51.d
...........\...\......\system_nrf51.o
...........\battery.c
...........\battery.h
...........\ble_bondmngr_cfg.h
...........\led.c
...........\led.h
...........\main.c
...........\main.h
...........\pstorage_platform.h
...........\arm\_build
...........\arm
ble_app_hrs

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