https://devzone.nordicsemi.com/f/nordic-q-a/22659/mtu-size-error● device : nRF52832 ● sdk : 13.0.0 ● softdevice : 4.0.2 Hi, I have a problem with change mtu size. I changed mtu size in sdk_config.h, but android application can&#39;t read mtu. So, i modified ble_stack_init() function in main.c like below. // Configureen-USTelligent Community 13Mon, 12 Jun 2017 00:14:21 GMThttps://devzone.nordicsemi.com/thread/89098?ContentTypeID=1Mon, 12 Jun 2017 00:14:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:de57446e-a934-4eba-98ca-0eebaf92e87cYoungjun<p>Thank you Kristin I used hrs service to modify ble_app_bps example. Maybe, i missed some code. When I use ble_app_hrs example, I can change mtu size.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/89099?ContentTypeID=1Fri, 09 Jun 2017 11:43:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e3754ca6-025d-4f39-9680-937a656c93eaFormerMember<p>Before testing the example, you should make sure that there are no errors. To do the testing, you can use ble_app_hrs without doing any modifications.</p> <p>For MTU request to work, the phone you are using has to support BLE 4.2.</p><div style="clear:both;"></div>