https://devzone.nordicsemi.com/f/nordic-q-a/9401/nrf52-ios-uart-application-disconnects-with-60-charactersHi, I am using nRF52 + Eclipse (gcc) with the ble_app_uart application. I have an iPhone 6+ with nRF UART app running. If I send &lt;= 59 characters through the virtual UART they appear in the app log. If I send &gt;= 60 characters the nRF UARTen-USTelligent Community 13Wed, 23 Sep 2015 17:59:35 GMThttps://devzone.nordicsemi.com/thread/34682?ContentTypeID=1Wed, 23 Sep 2015 17:59:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:16f7d456-f944-499f-88da-54d01c2f7b60ajlennon<p>I think I see the problem.</p> <p>app_error_handler() is being called which is resulting in a call to NVIC_SystemReset()</p> <p>The error code is 0x3004 which seems to be detailed here</p> <p><a href="https://devzone.nordicsemi.com/question/17211/error-code-0x3004/">devzone.nordicsemi.com/.../</a></p> <p>i.e. BLE_ERROR_NO_TX_BUFFERS</p> <p>So it seems that the UART example needs to ensure it has free buffers before attempting to send the data...</p><div style="clear:both;"></div>