https://devzone.nordicsemi.com/f/nordic-q-a/2510/data-transmission-and-reception-over-bleHi, I am new to BLE Development. Currently I am using NORDIC Development board (SDK Ver 5.2 &amp;Soft device S110). I want to write a small program to establish the connection and do some data exchange between Central and Peripheral. With the help of nANen-USTelligent Community 13Tue, 13 May 2014 14:50:54 GMThttps://devzone.nordicsemi.com/thread/10061?ContentTypeID=1Tue, 13 May 2014 14:50:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:84b650d9-82dc-410e-a9b0-7d5f6c139dffFormerMember<p>One way to do this by (modifying the reference nAN-36):</p> <ol> <li>When the peripheral gets a value in any writable attribute from a central, the write handler is called. It is led_write_handler in main.c in nAN-36.</li> <li>In the write handler, notify the central using another attribute with the data received. Then the notified attribute will be updated in the central with the value it sent originally.</li> </ol> <p>I guess this brief description is not good enough to give a clear idea, but start playing with the nAN-36 code, testing with the nrf Master Control app and you&#39;ll get a hang of it. Cheers, Prithvi</p><div style="clear:both;"></div>