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Stopping a test shuts down the control socket, so iperf_run_client() returns -1 with "unable to send control message ... Broken pipe". That is the expected consequence of the stop, not a fault, but the bridge read the negative return as a failure — so pressing STOP left the UI showing "Error (exit 1)" above a broken-pipe message. The bridge now consults its own g_stop flag before classifying the outcome, and the distinction travels up as Iperf3Result.stopped so the status line can say "Stopped". A stop is reported with exit code 0: the run ended the way the user asked it to. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>