https://devzone.nordicsemi.com/f/nordic-q-a/12040/apk-can-t-write-a-data-to-51822Hi, I flashed the Proximity Application to nrd51822,with s110_nrf51822_6.0.0-5.beta. the chip run right, and I used the NRF Master Control Panel, when I write data 0X02 to immediate Alert service,the led is on. when I used my own apk, and write 0x02en-USTelligent Community 13Mon, 22 Feb 2016 09:59:42 GMThttps://devzone.nordicsemi.com/thread/45577?ContentTypeID=1Mon, 22 Feb 2016 09:59:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e5a114e1-8d55-4754-82e0-da90b2c1087erun_ar<p>First: Please update your softdevice. I would definitively not recommend using an old beta version.</p> <p>What does your APK do? Can you capture a sniffer trace showing the functioning situation and another one showing the non working case?</p><div style="clear:both;"></div>