iOS peripheral and nRF51822 central writing charhttps://devzone.nordicsemi.com/f/nordic-q-a/13404/ios-peripheral-and-nrf51822-central-writing-charHello, Situation: I am trying to write a characteristic to an iOS device acting as a peripheral from a nRF51822 board. The board has 2 leds (green and red) and a button. The iOS device is running an app exposing a service (let&#39;s say it&#39;s IDen-USTelligent Community 13Thu, 21 Apr 2016 20:16:50 GMTRE: iOS peripheral and nRF51822 central writing charhttps://devzone.nordicsemi.com/thread/51140?ContentTypeID=1Thu, 21 Apr 2016 20:16:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4bfc8b79-60f2-4226-b521-3bf3eb520526Ulrich Myhre<p><a href="https://en.wikipedia.org/wiki/Rubber_duck_debugging">Rubber Duck Debugging</a> sometimes work out :) Good that you found your solution!</p><div style="clear:both;"></div>RE: iOS peripheral and nRF51822 central writing charhttps://devzone.nordicsemi.com/thread/51139?ContentTypeID=1Thu, 21 Apr 2016 17:57:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:783f5725-8060-47d6-885c-0f28ce23c991d4nk<p>Well, first of all, sorry for wasting your time.</p> <p>Sometimes happens that after a some days trying to make it work and then going to the forums to post the question, just a couple of minutes later you find the solution.</p> <p>I will post the solution here for anyone with the same problem:</p> <p>I just used the characteristic CCCD handle (charateristics[i].cccd_handle) instead of the characteristic handle value (charateristics[i].characteristic.handle_value) when filling the sd_ble_gattc_write params handle.</p><div style="clear:both;"></div>