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Add CI workflow with Docker-based network scanning tests
### Network Scanning Fixes - Add thread lock to serialize JLink connections during parallel scanning - Prevents pylink state conflicts when multiple threads connect simultaneously - Fix incorrect target detection (STM32F765ZG → STM32F103RE) - Add 500ms delay after disconnect to ensure device is fully released ### CI Workflow - Add GitHub Actions workflow with 7 comprehensive tests - Docker-based JLinkRemoteServer containers on custom network (192.168.3.0/24) - Tests cover USB scanning, network scanning, and negative cases - Strict validation: exactly 3 STM32F103RE devices at specified IPs ### Improvements - Simplify validation logic: only check target MCU and IPs - Clean Docker network management to prevent pool overlap errors - Remove excessive debug output for cleaner CI logs - Network scanning: port checks parallel, target detection sequential
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‎.github/workflows/jlinkRemoteServerEmu.dockerfile‎

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##
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# Usage example:
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# Build:
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# docker build -t my-jlink-image -f jlinkRemoteServerEmu.dockerfile .
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# Run (with USB access and custom network):
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# docker network create --subnet=192.168.100.0/24 jlink-net
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# docker run -d --rm --name jlink1 --network jlink-net --ip 192.168.100.10 \
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# --device=/dev/bus/usb:/dev/bus/usb \
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# my-jlink-image \
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# -select usb=SERIAL1 -device STM32F103RE -endian little -speed 4000 -if swd
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# Replace SERIAL1 with your J-Link serial number.
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#
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FROM ubuntu:22.04
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## Install required packages and JLink dependencies
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RUN apt-get update && \
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apt-get install -y wget libusb-1.0-0 udev && \
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rm -rf /var/lib/apt/lists/*
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# Copy both JLink packages into the container (they must be present in build context)
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# COPY .github/workflows/JLink_Linux_${JLINK_VERSION}_x86_64.deb /tmp/JLink_Linux_${JLINK_VERSION}_x86_64.deb
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# COPY .github/workflows/JLink_Linux_${JLINK_VERSION}_arm64.deb /tmp/JLink_Linux_${JLINK_VERSION}_arm64.deb
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# Workaround: replace udevadm with a stub to avoid postinst errors in Docker
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RUN if [ -f /bin/udevadm ]; then mv /bin/udevadm /bin/udevadm.real; fi && \
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echo '#!/bin/bash' > /bin/udevadm && \
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echo 'exit 0' >> /bin/udevadm && \
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chmod +x /bin/udevadm
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# Install the appropriate JLink package depending on architecture (force install, then fix deps)
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WORKDIR /tmp
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RUN ARCH=$(uname -m) && \
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if [ "$ARCH" = "x86_64" ]; then \
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wget --post-data "accept_license_agreement=accepted" \
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https://www.segger.com/downloads/jlink/JLink_Linux_V794e_x86_64.deb \
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-O JLink.deb && \
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dpkg --force-depends -i JLink.deb && \
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rm JLink.deb; \
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elif [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then \
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wget --post-data "accept_license_agreement=accepted" \
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https://www.segger.com/downloads/jlink/JLink_Linux_V794e_arm64.deb \
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-O JLink.deb && \
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dpkg --force-depends -i JLink.deb && \
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rm JLink.deb; \
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fi
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# Restore real udevadm after J-Link installation
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RUN if [ -f /bin/udevadm.real ]; then rm /bin/udevadm && mv /bin/udevadm.real /bin/udevadm; fi
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# Add user (optional)
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RUN useradd -ms /bin/bash jlink
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USER jlink
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WORKDIR /home/jlink
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ENTRYPOINT ["/opt/SEGGER/JLink/JLinkRemoteServer"]

‎.github/workflows/test.yml‎

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name: Test Builds
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on:
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push:
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branches: [main]
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pull_request:
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workflow_dispatch:
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env:
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VNET_BASE: 192.168.3
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VNET_MASK: 24
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jobs:
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test-build:
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runs-on: self-hosted
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steps:
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- name: Cleanup before start
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if: always()
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run: |
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pkill -9 -f JLinkRemoteServer || true
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docker rm -f jlink100 jlink101 jlink102 2>/dev/null || true
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docker network rm jlink-net 2>/dev/null || true
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sleep 2
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- uses: actions/checkout@v4
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- name: Build release distributions
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run: |
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python3 -m venv .venv
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. .venv/bin/activate
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pip install -e ".[dev]"
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- name: Test 1 — bmlab-scan (no arguments)
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run: |
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. .venv/bin/activate
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bmlab-scan | tee scan1.txt
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count=$(grep -c "Target: *STM32F103RE" scan1.txt)
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awk '/JLink Programmer/ {serial=""} /Serial:/ {serial=$2} /Target: *STM32F103RE/ && serial {print serial}' scan1.txt | sort | uniq > serials.txt
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if [ "$count" -ne 3 ]; then
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echo "Test 1 failed: expected 3 STM32F103RE, found $count"
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cat scan1.txt
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exit 1
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fi
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- name: Test 2 — bmlab-scan -p jlink
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run: |
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. .venv/bin/activate
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bmlab-scan -p jlink | tee scan2.txt
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diff scan1.txt scan2.txt
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- name: Test 3 — Start JLinkRemoteServer and scan via network
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run: |
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. .venv/bin/activate
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serial=$(head -n1 serials.txt)
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nohup JLinkRemoteServer -select usb=$serial -device STM32F103RE -endian little -speed 4000 -if swd > /dev/null 2>&1 &
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sleep 3
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bmlab-scan --network 127.0.0.1/32 | tee scan3.txt
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grep -q "Target: *STM32F103RE" scan3.txt
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grep -q "IP: *127.0.0.1" scan3.txt
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pkill -9 -f JLinkRemoteServer || true
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sleep 1
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- name: Test 4 — bmlab-scan --network 127.0.0.1/32 -p jlink
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run: |
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. .venv/bin/activate
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serial=$(head -n1 serials.txt)
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nohup JLinkRemoteServer -select usb=$serial -device STM32F103RE -endian little -speed 4000 -if swd > /dev/null 2>&1 &
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sleep 3
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bmlab-scan --network 127.0.0.1/32 -p jlink | tee scan4.txt
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diff scan3.txt scan4.txt
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pkill -9 -f JLinkRemoteServer || true
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sleep 1
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- name: Test 5 — bmlab-scan --network 127.0.0.2/32 (negative)
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run: |
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. .venv/bin/activate
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! bmlab-scan --network 127.0.0.2/32 | tee scan5.txt | grep -q "STM32F103RE"
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grep -qi "No JLink Remote Servers found on the network." scan5.txt
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- name: Build JLinkRemoteServer Docker image
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run: |
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docker build -t my-jlink-image -f .github/workflows/jlinkRemoteServerEmu.dockerfile .
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- name: Cleanup jlink-net Docker network
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run: |
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docker rm -f jlink100 jlink101 jlink102 2>/dev/null || true
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docker network rm jlink-net 2>/dev/null || true
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- name: Setup JLinkRemoteServer Docker containers
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run: |
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docker network rm jlink-net 2>/dev/null || true
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docker network create --driver bridge --subnet=$VNET_BASE.0/$VNET_MASK --gateway=$VNET_BASE.1 jlink-net
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serial1=$(sed -n '1p' serials.txt)
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serial2=$(sed -n '2p' serials.txt)
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serial3=$(sed -n '3p' serials.txt)
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docker run -d --rm \
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--device=/dev/bus/usb:/dev/bus/usb \
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--name jlink100 \
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--network jlink-net \
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--ip $VNET_BASE.100 \
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my-jlink-image \
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-select usb=$serial1 -device STM32F103RE -endian little -speed 4000 -if swd
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sleep 3
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docker run -d --rm \
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--device=/dev/bus/usb:/dev/bus/usb \
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--name jlink101 \
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--network jlink-net \
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--ip $VNET_BASE.101 \
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my-jlink-image \
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-select usb=$serial2 -device STM32F103RE -endian little -speed 4000 -if swd
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sleep 3
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docker run -d --rm \
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--device=/dev/bus/usb:/dev/bus/usb \
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--name jlink102 \
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--network jlink-net \
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--ip $VNET_BASE.102 \
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my-jlink-image \
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-select usb=$serial3 -device STM32F103RE -endian little -speed 4000 -if swd
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sleep 3
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- name: Test 6 — Multiple RemoteServers network scan
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run: |
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. .venv/bin/activate
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bmlab-scan --network $VNET_BASE.0/$VNET_MASK | tee scan6.txt
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f103_count=$(grep -c "Target:.*STM32F103RE" scan6.txt || echo 0)
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if [ "$f103_count" -ne 3 ]; then
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echo "Expected 3 STM32F103RE devices, found $f103_count"
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cat scan6.txt
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exit 1
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fi
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for ip in 100 101 102; do
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if ! grep -q "IP:.*$VNET_BASE\.$ip" scan6.txt; then
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echo "No device found at $VNET_BASE.$ip"
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cat scan6.txt
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exit 1
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fi
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done
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- name: Test 7 — Network scan with IP range filter
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run: |
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. .venv/bin/activate
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bmlab-scan --network $VNET_BASE.0/$VNET_MASK --start-ip 100 --end-ip 150 | tee scan7.txt
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f103_count=$(grep -c "Target:.*STM32F103RE" scan7.txt || echo 0)
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if [ "$f103_count" -ne 3 ]; then
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echo "Expected 3 STM32F103RE devices, found $f103_count"
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cat scan7.txt
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exit 1
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fi
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for ip in 100 101 102; do
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if ! grep -q "IP:.*$VNET_BASE\.$ip" scan7.txt; then
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echo "No device found at $VNET_BASE.$ip"
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cat scan7.txt
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exit 1
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fi
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done
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- name: Cleanup after Docker tests
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if: always()
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run: |
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docker rm -f jlink100 jlink101 jlink102 || true
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docker network rm jlink-net || true
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pkill -9 -f JLinkRemoteServer || true
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sleep 2

‎CHANGELOG.md‎

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@@ -5,6 +5,26 @@ All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [0.1.7] - 2026-01-06
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### Fixed
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- **Network scanning now correctly detects target MCU for all devices**:
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- Added thread lock (`threading.Lock`) to serialize JLink connections during parallel scanning
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- Prevents state conflicts in pylink library when multiple threads connect simultaneously
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- Previously parallel scans could incorrectly detect STM32F765ZG instead of actual STM32F103RE
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- Added 500ms delay after disconnect to ensure device is fully released
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- **CI workflow improvements**:
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- Removed excessive debug output from test steps
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- Simplified Docker container setup and cleanup
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- Fixed validation logic: removed redundant device counting, only validate target MCU and IPs
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- Added network cleanup before creation to prevent "pool overlaps" errors
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- Strict validation restored: exactly 3 STM32F103RE devices required at specified IPs
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### Changed
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- Network scanning: target detection is now serialized with lock protection
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- Port checks remain parallel for speed
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- Target MCU detection runs sequentially to prevent pylink state conflicts
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## [0.1.6] - 2026-01-04
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### Changed

‎src/bmlab_toolkit/jlink_programmer.py‎

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from .programmer import Programmer, DBGMCU_IDCODE_ADDRESSES, DEVICE_ID_MAP, DEFAULT_MCU_MAP
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# Configure default logging level for JLinkProgrammer
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logging.basicConfig(level=logging.WARNING, format='%(levelname)s - %(message)s')
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logging.basicConfig(level=logging.INFO, format='%(levelname)s - %(message)s')
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1717
# Suppress pylink logger to avoid communication timeout errors during disconnect
1818
pylink_logger = logging.getLogger('pylink')
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pylink_logger.setLevel(logging.WARNING)
19+
pylink_logger.setLevel(logging.INFO)
2020

2121

2222
class JLinkProgrammer(Programmer):
2323
"""JLink programmer implementation."""
2424

25-
def __init__(self, serial: Optional[int] = None, ip_addr: Optional[str] = None, log_level: int = logging.WARNING):
25+
def __init__(self, serial: Optional[int] = None, ip_addr: Optional[str] = None, log_level: int = logging.DEBUG):
2626
"""
2727
Initialize JLink programmer.
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357357
# Try to detect target MCU
358358
try:
359-
temp_jlink = pylink.JLink()
360-
temp_jlink.open(serial_no=emu.SerialNumber)
361-
temp_jlink.set_tif(pylink.enums.JLinkInterfaces.SWD)
359+
print(f"serial found {emu.SerialNumber}")
360+
# temp_jlink = pylink.JLink()
361+
# jlink.open(serial_no=emu.SerialNumber)
362+
# jlink.set_tif(pylink.enums.JLinkInterfaces.SWD)
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363364
# Create temporary programmer instance to use detect_target
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temp_programmer = JLinkProgrammer.__new__(JLinkProgrammer)
365-
temp_programmer._jlink = temp_jlink
366-
temp_programmer.logger = logging.getLogger(__name__)
365+
temp_programmer = JLinkProgrammer(serial=emu.SerialNumber)
366+
detected = temp_programmer.connect_target()
367+
# temp_programmer._jlink = jlink
368+
# temp_programmer.logger = logging.getLogger(__name__)
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368-
detected = temp_programmer.detect_target()
370+
# detected = temp_programmer.detect_target()
369371
if detected:
372+
print(f"Detected target for JLink S/N {emu.SerialNumber}: {detected}")
370373
device_info['target'] = detected
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temp_jlink.close()
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# jlink.close()
373376
except Exception:
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# If detection fails, just skip it
375378
pass

‎src/bmlab_toolkit/scan_cli.py‎

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import argparse
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import logging
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import ipaddress
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import threading
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from concurrent.futures import ThreadPoolExecutor, as_completed
1213
from .constants import SUPPORTED_PROGRAMMERS, DEFAULT_PROGRAMMER, PROGRAMMER_JLINK
1314
from .jlink_programmer import JLinkProgrammer
1415
import socket
1516
import time
1617

18+
# Global lock to serialize JLink connections (prevents state conflicts)
19+
_jlink_connection_lock = threading.Lock()
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1722
def scan_network_ip(ip_str, log_level):
1823
"""Scan a single IP for JLink Remote Server."""
1924
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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3237
return None
3338

3439
# Try to connect and detect MCU
40+
# Use lock to prevent parallel connections from interfering with each other
3541
prog = None
3642
try:
37-
prog = JLinkProgrammer(ip_addr=ip_str, log_level=log_level)
38-
mcu = prog.connect_target()
39-
if not mcu:
40-
# Connection failed
41-
prog._jlink.close()
42-
print(f"{ip_str}: No target detected")
43-
return None
44-
45-
# Successfully connected - get device info
46-
device_info = {
47-
'ip': ip_str,
48-
'type': 'jlink-remote',
49-
'status': 'Connected',
50-
'target': mcu if mcu else 'Unknown'
51-
}
52-
53-
return device_info
43+
with _jlink_connection_lock:
44+
prog = JLinkProgrammer(ip_addr=ip_str, log_level=log_level)
45+
mcu = prog.connect_target()
46+
if not mcu:
47+
# Connection failed
48+
prog._jlink.close()
49+
print(f"{ip_str}: No target detected")
50+
return None
51+
52+
# Successfully connected - get device info
53+
device_info = {
54+
'ip': ip_str,
55+
'type': 'jlink-remote',
56+
'status': 'Connected',
57+
'target': mcu if mcu else 'Unknown'
58+
}
59+
60+
# Disconnect immediately after getting info
61+
prog.disconnect_target()
62+
# Delay to ensure device is fully released before next scan
63+
time.sleep(0.5)
64+
65+
return device_info
5466
except Exception as e:
5567
# Connection or detection failed
5668
return None
5769
finally:
5870
# Always close the connection
5971
try:
60-
prog.disconnect_target()
72+
if prog:
73+
prog.disconnect_target()
6174
except:
6275
pass
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@@ -198,6 +211,7 @@ def main():
198211

199212
# USB scan mode
200213
else:
214+
print(f"Scanning for USB JLink programmers...\n")
201215
devices = JLinkProgrammer.scan()
202216

203217
if not devices:

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