https://devzone.nordicsemi.com/f/nordic-q-a/4451/time-from-power-on-to-connect-with-master-slaveHello, I am new to nRF51822, and trying to make a simple application for master - slave data transfer. I want to know how Much time passes from the start of the device until the connection to the master \ slave. What are possible solutions to thisen-USTelligent Community 13Thu, 13 Nov 2014 15:30:34 GMThttps://devzone.nordicsemi.com/thread/15818?ContentTypeID=1Thu, 13 Nov 2014 15:30:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:97428419-9535-4276-9e2f-e82c268a4fa2John<p>If I am understanding your question properly, you want to know how much time elapses from the time the slave starts running to when a master connects to it. One way to do it would be to start the Real Time Counter (RTC) when the slave initializes, set a breakpoint where a connection occurs and check the counter value in the RTC in the debugger.</p> <p>Even with no prescaler it takes 512 seconds for the COUNTER to roll over if I recall correctly. The only tricky thing would be if the RTC continues to run when a breakpoint is hit. In which case, stash the counter into a global variable and check that with the debugger instead.</p><div style="clear:both;"></div>