Standalone Installation of HiveMQ on Windows Server 2022

Running Windows Environment e.g. HiveMQ Installation Guide - Windows Server 2022 on AWS
Check Minimum system hardware requirements https://docs.hivemq.com/hivemq/latest/user-guide/system-requirements.html#minimum
Install JRE (OpenJDK JRE 11 or newer is required.)
- Download and Install JRE 11 or later https://adoptium.net/en-GB/temurin/releases/?arch=x64&os=windows&package=jre&version=11. Please do note the Java version for the next step(11.0.22 in our case).
- (Recommended) Set the Environmental variable during installation can be done by enabling the following setting
- Set JAVA_HOME Environment Variable manually:
  - Right-click on "This PC" and select "Properties".
  - Click on "Advanced system settings".
  - In the System Properties window, go to the "Advanced" tab and click on "Environment Variables".
  - Under "System Variables", click "New" and add a new variable:
    - Variable name: JAVA_HOME
    - Variable value: the path to your Java installation (e.g., C:\Program Files\Java\jdk-11.0.22).
  - Click OK to close all dialogues.

Download and Extract HiveMQ:
- First, you need to download the HiveMQ ZIP file from the official HiveMQ website. https://www.hivemq.com/download/
- Unzip the folder to C:\ e.g. C:\hivemq-4.25.1
- Rename this folder to hivemq so the path looks like C:\hivemq
- Files inside the folder would have a structure e.g. C:\hivemq\bin
Doing sanity checks
- Setting Heap to 50% of system memory (2GB minimum, 4GB in this installation as RAM is 8 GB)
  - Go to C:\hivemq\bin
  - Open the run.bat file with Notepad or any other editor
  - Search for the VARIABLES section
  - Add the heap configuration (4 GB in this case)
    set "JAVA_OPTS=%JAVA_OPTS% -Xmx4g"
  - Save the file
Run HiveMQ broker
- Go to C:\hivemq\bin
- Right-click on the file “run.bat” and run it as an administrator
- This should start the HiveMQ process as shown below

Please make sure HiveMQ Broker is running
Please make sure that port 1883 is enabled (e.g. inbound rules under security groups)
Setup MQTT CLI
- Download MQTT CLI
  - Go to the release link https://hivemq.github.io/mqtt-cli/ and go to the latest release
  - Download the correct zip for Windows (mqtt-cli-4.25.0-win.zip on our case)
  - Extract the zip file
  - Open the command prompt and cd into the CLI folder, this folder contains mqtt-cli.exe which will be used for the next steps
Subscribe to a Topic: Subscribe to a topic using MQTT CLI with the command:
```
mqtt-cli.exe sub -h localhost -p 1883 -i MQTTCLIClientSUB -t "connection/test"
```
This command subscribes to the topic connection/test on the broker running on localhost.
Publish to the Same Topic: Open another command prompt window, cd to the mqttcli folder and publish a message to the same topic with:
```
mqtt-cli.exe pub -h localhost -p 1883 -i MQTTCLIClientPUB -t "connection/test" -m "Test MQTT CLI"
```
This publishes the message "Test MQTT CLI" to the connection/test topic.
Verify Message Receipt: Check the first command prompt window where you subscribed to the topic. You should see the message "Test MQTT CLI" appear, indicating that the message was successfully published and received.