https://devzone.nordicsemi.com/f/nordic-q-a/50871/nrf52840-android-application-add-supplementary-led-and-buttonsi am student who studying nrf52840 DK. i want to modify ble_app_blinky, to add supplementary led and buttons like this url https://www.youtube.com/watch?v=l3q5e6pC8vU i modified [ble_lbs_init] in [ble_lbs.c] add_char_params.init_len = sizeof(uint16_ten-USTelligent Community 13Mon, 12 Aug 2019 11:33:41 GMThttps://devzone.nordicsemi.com/thread/203553?ContentTypeID=1Mon, 12 Aug 2019 11:33:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b09944ce-7ad4-439d-ad45-d3cb4c6ab2d8Amanda Hsieh<p><span lang="nb-NO">Hi,&nbsp;</span></p> <p><span lang="nb-NO"></span></p> <p><span lang="nb-NO"></span><span lang="nb-NO">What is the purpose of adding the</span><span lang="en-US"> led index, (i.e led0, led1, led2, led3)?</span></p> <p><span lang="en-US"><span>I recommend looking at our tutorials&nbsp;</span><a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial">here</a><span>&nbsp;and the application note&nbsp;</span><a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/ble_sdk_app_blinky.html">here</a><span>.</span></span></p> <p><span lang="en-US"></span></p> <p><span lang="en-US">-Amanda H.&nbsp;</span></p><div style="clear:both;"></div>