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Dev Guide

IoT Edge is written in C# and Rust. The C# development setup is described below. The Rust development setup is described here.

If you want to run tests outside of the pipelines, you will need to be running linux.

Setup

Make sure the following dependencies are installed in your environment before you build IoT Edge code:

Dependency Notes
.NET Core 3.1 Installation instructions here.
Java Not needed if building in VS IDE (Windows). Otherwise, a JRE is required to compile the Antlr4 grammar files into C# classes, and java must be on your path.

Build

Besides using Visual Studio in Windows, you can build by running the build script:

scripts/linux/buildBranch.sh

Binaries are published to target/publish/.

Run unit tests

Besides using Test Explorer in Visual Studio, you can run the unit tests with:

scripts/linux/runTests.sh

Run integration tests

To run integration tests and/or BVTs, make sure the following dependencies are installed in your environment:

Dependency Notes
Azure CLI Installation instructions here
Powershell Installation instructions here
Jq Installation instructions here
Docker Installation instructions here. In Linux environments, be sure to follow the post-installation steps so the tests can run without sudo.

The integration tests and BVTs expect to find certain values in an Azure KeyVault (see edge-util/test/Microsoft.Azure.Devices.Edge.Util.Test.Common/settings/base.json). For the tests to access the KeyVault at runtime, a certificate must first be installed in the environment where the tests will run. Install the KeyVault certificate with:

az login # Login and select default subscription, if necessary

scripts/linux/downloadAndInstallCert.sh -v <VaultName> -c <CertName>
Argument Description
VaultName KeyVault name. See az keyvault secret show help.
CertName Certificate name. See --secret in az keyvault secret show help.

Then run the tests either with Test Explorer in Visual Studio IDE, or with:

scripts/linux/runTests.sh "--filter Category=Integration"

The syntax of the "filter" argument is described here. All IoT Edge tests are categorized as one of Unit, Integration, or Bvt.

Run the end-to-end tests

The end-to-end tests are documented here.

Build Edge Hub Container Locally

Sometimes it is useful to build the Edge Hub container locally. If you want to do so you can run the below set of scripts:

scripts/linux/buildBranch.sh
scripts/linux/cross-platform-rust-build.sh --os alpine --arch amd64 --build-path mqtt/mqttd
scripts/linux/cross-platform-rust-build.sh --os alpine --arch amd64 --build-path edgehub/watchdog
scripts/linux/consolidate-build-artifacts.sh --artifact-name "edge-hub"
scripts/linux/buildImage.sh -r "$(registry.address)" -u "$(registry.user)" -p "$(registry.password)" -i "${{ parameters.imageName }}" -n "${{ parameters.namespace }}" -P "${{ parameters.project }}" -v "${{ parameters.version }} --bin-dir target"

Build Manifest Image

There is a script in the repo to build multi-architecture images. This script assumes that the platform specific images are already in the docker registry. Usage is as follows:

$ scripts/linux/buildManifest.sh --help

buildManifest.sh [options]
Note: Depending on the options you might have to run this as root or sudo.

options
 -r, --registry       Docker registry required to build, tag and run the module
 -u, --username       Docker Registry Username
 -p, --password       Docker Username's password
 -v, --image-version  Docker Image Version.
 -t, --template       Yaml file template for manifest definition.