https://devzone.nordicsemi.com/f/nordic-q-a/74000/nrf51822-and-rn4871-isuuesHello, currently am working on connecting two different modules of BLE, nrf51822 and Rn4871. The problem am facing is that i am not able to send and receive data between the two modules. i succeeded on connecting them to each other: nrf51 is centralen-USTelligent Community 13Mon, 19 Apr 2021 14:15:14 GMThttps://devzone.nordicsemi.com/thread/305597?ContentTypeID=1Mon, 19 Apr 2021 14:15:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:74dcbcc7-89bb-4177-8033-447b1aff351aMarjeris Romero<p>Hi,</p> <p>Since these two are different Bluetooth modules from different producers they have different BLE UART services.</p> <p>The Nordic UART service (NUS) used in the ble_app_uart example is a custom service different from the one used by the Microchip module:<br /><a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ble_sdk_app_nus_eval.html">https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ble_sdk_app_nus_eval.html</a></p> <p>My recomendation is to decide on which custom service you want to use and implement it on the other module. We have a tutorial for how to implement a custom BLE service on nRF5 SDK here: <a href="https://github.com/NordicPlayground/nRF5x-custom-ble-service-tutorial">https://github.com/NordicPlayground/nRF5x-custom-ble-service-tutorial</a></p> <p>Best regards,</p> <p>Marjeris</p><div style="clear:both;"></div>