https://devzone.nordicsemi.com/f/nordic-q-a/10905/issue-with-nrf51sdk-s130-ble_app_hrs_c-central-rolemy purpose is to use the 51422 or 52382 as a central role to search my own service, or any other SIG standard services. DK :nrf51422 , version : 9.0.0 and 10.0.0,(i had tried two versions) description: in the main function ,there is a printfen-USTelligent Community 13Thu, 17 Dec 2015 09:37:12 GMThttps://devzone.nordicsemi.com/thread/40776?ContentTypeID=1Thu, 17 Dec 2015 09:37:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8f6538a4-cba6-4388-a3ed-563c50d395e0Petter Myhre<p>Are you experiencing this with the unmodifed examples? What PC uart tool are you using? Are you using flow control?</p><div style="clear:both;"></div>