https://devzone.nordicsemi.com/f/nordic-q-a/6936/ble-hid-keyboard-crashing-android-bt-stackDear Nordic, I am using a pretty much unmodified version of the BLE HID Keyboard example from the Nordic BLE SDK (straight of github). I only modified pins, and disabled the sleep mode code (eg. after a timeout, it just starts advertising again, noten-USTelligent Community 13Tue, 12 May 2015 12:44:20 GMThttps://devzone.nordicsemi.com/thread/24458?ContentTypeID=1Tue, 12 May 2015 12:44:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:25037336-2d9c-460c-a17b-1784c07f42dbrun_ar<p>Sounds like it is an Android problem, However to find out we need a <a href="https://www.nordicsemi.com/eng/nordic/download_resource/26770/14/88316776">sniffer</a> log that shows what is happening on Air? Do you also have serial output with debugging enabled from the Arduino (lib_aci_init(&amp;aci_state, true);)?</p><div style="clear:both;"></div>