platformio/platformio-core

Add "break" support to "pio test" ?

Open

#5,310 opened on Nov 12, 2025

View on GitHub
 (0 comments) (0 reactions) (0 assignees)Python (791 forks)batch import
help wantedunit testing

Repository metrics

Stars
 (7,329 stars)
PR merge metrics
 (Avg merge 109d 16h) (5 merged PRs in 30d)

Description

For STM32 via ST-Link, the RTS and DTR modes to reset an uploaded test app don't work. The documented workaround is to add a 2s startup delay.

To considerably speed things up when running multiple tests, pio test could send a BREAK on the serial port, which does an immediate reset.

Would it be possible to add an option to send a break once connected to the USB serial port?

Contributor guide

Research direction
Study how to send a serial break signal in Python using pyserial's break condition and integrate an option in pio test command for STM32 devices.
Tech stack
python
Domain
testing
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
GitPythonPlatformIO basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60