https://devzone.nordicsemi.com/f/nordic-q-a/45623/how-to-measure-the-ble-uart-data-rateHi, We are planning to develop an IOT device using the nRF52840 which will communicate with a Hub device which will contain another nRF52840 chip, so we want to check the data rate that can be achieved when using BLE UART profile between the 2 nRF52840en-USTelligent Community 13Wed, 03 Apr 2019 08:04:29 GMThttps://devzone.nordicsemi.com/thread/179898?ContentTypeID=1Wed, 03 Apr 2019 08:04:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f9cb62a6-84b3-4b8f-b83e-fe442ad43fb9ovrebekk<p>Hi Jibin</p> <p>The easiest way to measure data rate is to simply count the number of bytes sent (by incrementing a counter every time you send some data), and check the counter at fixed intervals using an app_timer. If you make the app_timer fire every second then the counter will contain the number of bytes sent over the last second, and you can clear it after reading it out.&nbsp;</p> <p>For the most accurate readings you should use the external LF crystal rather than the internal LF RC oscillator, as the accuracy of the app_timer module is set by the LF clock source.&nbsp;</p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>