https://devzone.nordicsemi.com/f/nordic-q-a/23278/uart-communication-without-cts-rtsHello, I am using nRF51822 and an STM32 communicating over UART. I want to test UART communication without CTS and RTS so I did the configuration as shown below: static void uart_init(void) { uint32_t err_code; const app_uart_comm_params_ten-USTelligent Community 13Fri, 07 Jul 2017 08:42:04 GMThttps://devzone.nordicsemi.com/thread/91531?ContentTypeID=1Fri, 07 Jul 2017 08:42:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ce427e34-2591-459c-a37d-e23d52565a5eBayram ZAYET<p>Hello,</p> <p>Yes I changed it to APP_UART_FLOW_CONTROL_DISABLED but I had to change my: BLE_USART_RTS_PIN_NUMBER, BLE_USART_CTS_PIN_NUMBER, both to NULL. and now it works .</p> <p>Regards,</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91530?ContentTypeID=1Thu, 06 Jul 2017 11:56:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:52dc53ef-7c0a-48c6-b396-1d8c759e6a51Sigurd<p>Hi,</p> <p>In order to not use CTS/RTS you only need to use <code>APP_UART_FLOW_CONTROL_DISABLED</code> as you have done. Did you remember to turn off the flow-control on the STM32 ?</p><div style="clear:both;"></div>