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MQTT Mosquitto-Test

This REPO offers a testing scenario, which connects to a MQTT Mosquitto Client using testcontainers.

Its main goal is reproducability.

Why is this REPO needed?

Setup

Tested on:

Hardware

  1. MacBook Pro

    • Processor: Apple M2 Pro
    • RAM: 32 GB
    • macOS: 14.2.1

  2. Desktop PC (only Test with Testcontainers)

    • Prozessor: AMD Ryzen 5 2600X Six-Core Processor with 3.60 GHz
    • RAM: 16 GB
    • Windows: 11 Home
    • Systemtype: 64-Bit OS/Prozessor

Software

  • Java OpenJDK v21
  • Spring Boot v3.2.x
  • Maven v3.9.x
  • IntelliJ: 2023.3.3
  • Docker Desktop: 4.27.0
  • Mosquitto:
    • brew info mosquitto ==> mosquitto: stable 2.0.18 (bottled)
    • testcontainers ==> DockerImageName.parse("eclipse-mosquitto:2.0.18"))

Installation for testing:

1) Local instance of mosquitto

brew install mosquitto
brew services start mosquitto

2) Check your mosquitto using bash:

mosquitto_sub -h localhost -p 1883 -t default
mosquitto_pub -h localhost -p 1883 -t default -m "Test message"

3) Verify assertion:

  • The MQTT Mosquitto client is available at tcp://localhost:1883.
    • Given in the src/main/resources/application.env

4) Check out the POM.mxl and run the maven lifecycle steps

  • clean
  • validate
  • compile

5) Run the Java-application (without TEST-Environment)

Do not forget to give the Mosquitto-URL parameter (.env-File).

Sample application-LOG:

2024-01-26T15:16:41.178+01:00  INFO 2318 --- [application] [-192.168.128.24] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2024-01-26T15:16:41.179+01:00  INFO 2318 --- [application] [-192.168.128.24] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2024-01-26T15:16:41.181+01:00  INFO 2318 --- [application] [-192.168.128.24] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms
2024-01-26T15:16:41.839+01:00  INFO 2318 --- [application] [   scheduling-1] de.application.domain.cron.MessageCron   : Scheduled CRON - publishing a new random UUID to topic: 'defaultTopic'
2024-01-26T15:16:51.822+01:00  INFO 2318 --- [application] [   scheduling-1] de.application.domain.cron.MessageCron   : Scheduled CRON - publishing a new random UUID to topic: 'defaultTopic'
2024-01-26T15:17:01.820+01:00  INFO 2318 --- [application] [   scheduling-1] de.application.domain.cron.MessageCron   : Scheduled CRON - publishing a new random UUID to topic: 'defaultTopic'

Sample mosquitto-LOG:

mosquitto_sub -h localhost -p 1883 -t defaultTopic
7d6de8e0-b825-4a4d-8daf-6af0e27ee421
6d9aad95-cc10-44c3-a48f-035cec099f41
fd4754ad-86f4-4c96-a9c9-0df7a80b2845

That far so good

Hopefully you faced no problems until here. Everything runs fine and 'as expected'.

Using the test-environment including Testcontainers

1) Start your docker-environment for the testcontainers

2) Start the test ... .. .

Either run the maven lifecycle step test .. OR .. go to the test failing at my side at:

  • src/test/java/de/slr/kbaas/authendpoint/AuthEndpointApplicationTest.java

3) . .. ... and fail

The test fails on 'client.connect',:

2024-01-26T15:15:41.829+01:00  INFO 2281 --- [application] [           main] d.a.i.m.mqtt.MqttServiceImpl             : Startup - ENV - mqttUrl - About to connect to    ==>   tcp://localhost:50318
2024-01-26T15:15:41.871+01:00 ERROR 2281 --- [application] [           main] d.a.i.m.mqtt.MqttServiceImpl             : Exception in 'connectToBroker' in 'MqttServiceImpl'

org.eclipse.paho.client.mqttv3.MqttException: Verbindung wurde getrennt
	at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:197) ~[org.eclipse.paho.client.mqttv3-1.2.5.jar:na]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]
Caused by: java.io.EOFException: null
	at java.base/java.io.DataInputStream.readUnsignedByte(DataInputStream.java:297) ~[na:na]
	at java.base/java.io.DataInputStream.readByte(DataInputStream.java:275) ~[na:na]
	at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:92) ~[org.eclipse.paho.client.mqttv3-1.2.5.jar:na]
	at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:137) ~[org.eclipse.paho.client.mqttv3-1.2.5.jar:na]
	... 1 common frames omitted

2024-01-26T15:15:42.488+01:00  INFO 2281 --- [application] [           main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 1 endpoint(s) beneath base path '/actuator'

Logs are given in:

  • logs/infrastructure/mqtt/foo

Fixing the MQTT mosquitto in this Testcontainers-setup

Change the DockerImageName.parse("eclipse-mosquitto:2.0.18")) in the applicationTest-class according to your local or published new mosquitto container.

Authors and acknowledgment

Technical & Maintenance:

  • dbraun1991 (Maintainer)