Unexpected UART Speed Difference with Tera Term Local Echo On vs Offhttps://devzone.nordicsemi.com/f/nordic-q-a/128708/unexpected-uart-speed-difference-with-tera-term-local-echo-on-vs-offI am testing the following setup: MCU (Nordic nRF52840) → UART (via level shifter) → Module → TCP server During testing, I observed different UART throughput depending on whether Local Echo is enabled in Tera Term. Test results: Local Echoen-USTelligent Community 13Tue, 14 Jul 2026 07:06:32 GMTRE: Unexpected UART Speed Difference with Tera Term Local Echo On vs Offhttps://devzone.nordicsemi.com/thread/569068?ContentTypeID=1Tue, 14 Jul 2026 07:06:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0cd53b1c-8512-4d31-ab92-3d0e7ae7bb93Turbo J<p>Check the TCP connection with a tool like wireshark.</p> <p>I suspect that local echo setting changes some internal buffering, and its possible that you see&nbsp;<em>TCP overhead</em> and not a bluetooth problem.</p><div style="clear:both;"></div>