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Security (CRITICAL): - KeyUtil: read JWT signing key from DC3_SECURITY_KEY env/property - UserPasswordServiceImpl: read default password from DC3_SECURITY_DEFAULT_PASSWORD env - KeyLoader: read OPC-UA keystore password from OPCUA_KEYSTORE_PASSWORD env - WebFilterConfig: return 401 on malformed X-Auth-User header - AlgorithmConstant: document deprecated hardcoded constants Thread safety (HIGH): - Fix TOCTOU races in 4 driver connectors (computeIfAbsent) - Fix PlcS7 lock leak, OpcUa connect timeout (5s) - CoapClientManager: synchronize setURI to prevent URI race - PointValueJob, MqttScheduleJob: add @DisallowConcurrentExecution - SystemHealthServiceImpl: preserve interrupt flag - WindowSampleBuffer: local AtomicInteger → int Performance (MEDIUM): - EntityStateExpiryScanner: batch alarm saves (saveBatch) - ImportDeviceServiceImpl: batch config saves - ResourceRegistrySyncServiceImpl: batch-load nodes, eliminate N+1 COUNTs - DriverSenderServiceImpl: debug-gate hot-path logging - PointServiceImpl: stream().count() → size() Null safety (LOW): - RegexUtil: null guards on isName/isPhone/isMail/isPassword/isHost - HostUtil: null-check getNetworkInterfaces() return - TimeUtil: log parse failures instead of silent null Infrastructure: - Add spring-boot-starter-cache + @EnableCaching CacheConfig - Replace embedded modbus4j/plc-s7 jars with external Maven dependencies - Add dc3-driver-modbus-rtu module
DC3 Common MQTT
Overview
dc3-common-mqtt is the shared MQTT client configuration module of the IoT DC3 platform. It provides auto-configuration
for MQTT connection, message handling, and topic
subscription used by the MQTT driver and any service requiring MQTT connectivity.
Module Information
- Group ID: io.github.pnoker
- Artifact ID: dc3-common-mqtt
- Version: 2026.5.22
Key Components
| Component | Purpose |
|---|---|
MqttConfig |
Auto-configures MqttClient based on environment properties |
MqttEnvironmentConfig |
Binds MQTT connection properties from YAML |
MqttUtil |
Utility methods for publishing/subscribing MQTT messages |
MqttInitRunner |
Startup runner for MQTT connection initialization |
Configuration Properties
Configure in application*.yml:
mqtt:
host: ${MQTT_HOST:dc3-emqx}
port: ${MQTT_PORT:1883}
username: ${MQTT_USERNAME:dc3}
password: ${MQTT_PASSWORD:dc3dc3dc3}
qos: 1
client-id: ${spring.application.name}
Usage
This module is activated when the mqtt profile is included or MQTT-related auto-configuration is on the classpath. The
MQTT driver (dc3-driver-mqtt) depends on this module as
its primary integration layer.
Build Instructions
mvn -s ../../.mvn/settings.xml clean package
Related Modules
dc3-driver-mqtt— Primary consumer of this module- For MQTT broker: use EMQX via
podman compose -f dc3/docker-compose-optional.yml up -d(port31883)
License
Copyright 2016-present the IoT DC3 original author or authors.
Licensed under the GNU Affero General Public License v3.0 (AGPL 3.0)