https://devzone.nordicsemi.com/f/nordic-q-a/23255/uart-without-flow-control-unreliableHi all, I&#39;m working on sdk11.0.0 and s130 softdevice. In my project I want to send data coming from uart to ble and data coming from ble to uart same as ble_app_uart example. uart configuration in my project as shown below In uart event handleren-USTelligent Community 13Wed, 05 Jul 2017 07:33:38 GMThttps://devzone.nordicsemi.com/thread/91452?ContentTypeID=1Wed, 05 Jul 2017 07:33:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9fb38d2e-d116-4461-ba39-5056976b183aJakub Rzeszutko<p>Hi, I am guessing there might be problem with app_uart buffer size. In SDK 13 we have added module nrf_serial (better implementation of app_uart) which could solve your problem.</p><div style="clear:both;"></div>