https://devzone.nordicsemi.com/f/nordic-q-a/44143/uart-serial-port-emulation-over-bleI&#39;m using the UART / Serial Port Emulation over BLE example on the nRF52 development kit connected to a custom microcontroller. I just need the nRF52 to simply relay bytes from the microcontroller UART back and forth over BLE. I have removed the checken-USTelligent Community 13Wed, 27 Feb 2019 09:42:53 GMThttps://devzone.nordicsemi.com/thread/173185?ContentTypeID=1Wed, 27 Feb 2019 09:42:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a5cff8e3-a86a-4947-952a-70e82a2ecdf9Simonr<p>Hi</p> <p>This is due to the default MTU length being set to 20 bytes maximum over UART. <a href="https://devzone.nordicsemi.com/f/nordic-q-a/7990/best-way-to-send-larger-chunks-of-data-through-ble-uart">This link</a> should explain how to write longer data chunks over UART.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/173108?ContentTypeID=1Tue, 26 Feb 2019 17:23:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f52c03eb-4347-48bb-99f0-2d51c5571934awneil[quote userid="77595" url="~/f/nordic-q-a/44143/uart-serial-port-emulation-over-ble"]It works fine as long as the received data from the UART is less than 20 bytes[/quote] <p>So what, exactly, happens when it isn&#39;t ?</p><div style="clear:both;"></div>