Greengrass Multi Language

This repository contains packages that can be built into Greengrass components.

1. java-mqtt-hello: Java package for publishing an MQTT message every second
2. python-mqtt-hello: Python package for publishing an MQTT message every second

Building

Dependencies

Java, Python, and Maven are required to build the packages in this repository. On Ubuntu, these can be installed using:

sudo apt install -y default-jre maven python3 python3-pip

All packages recommend building via the Greengrass Development Kit. It can be installed using:

pip3 install git+https://github.com/aws-greengrass/aws-greengrass-gdk-cli.git@v1.6.1

Finally, the AWS CLI must be installed and configured with valid credentials. See here for more details.

Configure Packages

To build each package successfully, locate its gdk-config.json and modify the author, version, publish bucket, and publish region. The publish bucket does not need to be a unique name, as the GDK will automatically append information to the bucket name unique to the account.

Build Packages

With dependencies installed, go into each package and execute:

gdk component build

Test

The packages can be deployed locally on a machine already running Greengrass. This step is automated using the scripts/local_deploy.sh located in each package. For example:

cd java-mqtt-hello
./scripts/local_deploy.sh

The MQTT Test Client in the AWS Console can then be used to check for incoming messages.

Publish

Each component can be published using gdk:

gdk component publish