- Last edited 10 months ago ago
How to integrate Azure IoT Edge on OpenSTLinux
1 Article purpose
The purpose of this article is to explain how to integrate the Microsoft Azure IoT Edge device  on OpenSTLinux.
This article explains step by step how to add the Yocto meta-data components needed on OpenSTLinux distribution, and how to configure and build the image.
You need to have an active Azure subscription, a "Free Trail" subscription is possible for 12 months. The way to do that is described in the Linux Quickstart document.
2.1 Hardware prerequisites
For more information about the STM32 discovery board and how to start it up, jump to this section Getting_started/STM32MP1_boards/STM32MP157C-DK2.
2.2 Software prerequisites
The STM32MP1 Distribution Package must be installed on your host. The process has been verified with the delivery ecosystem release v1.2.0 . For more information about the OpenSTLinux distribution package go to STM32MP1_Distribution_Package article.
Note that the software customizations have been applied on a (DISTRO: openstlinux-weston, MACHINE: stm32mp1) OpenSTLinux distribution environment, and for a st-image-weston image.
3 Software update with Yoto meta-iotedge and the dependencies
1.Get meta-iotedge  and the dependencies
cd [your STM32MP1 Distribution path]/layers/ git clone -b thud https://github.com/Azure/meta-iotedge.git git clone git://github.com/meta-rust/meta-rust.git git clone -b thud git://git.yoctoproject.org/meta-virtualization cd meta-rust git checkout c5ff05d1e99c1e80844c1673456e2368499918c7 -b INT_AZURE
2.Setup the build configuration
cd [your STM32MP1 Distribution path] DISTRO=openstlinux-weston MACHINE=stm32mp1 source layers/meta-st/scripts/envsetup.sh
3.Add the meta-iotedge layer and other dependencies yocto layers to the distribution configuration.
cd [your STM32MP1 Distribution path] bitbake-layers add-layer [your STM32MP1 Distribution path]/meta-rust/ bitbake-layers add-layer [your STM32MP1 Distribution path]/meta-virtualization/ bitbake-layers add-layer [your STM32MP1 Distribution path]/meta-iotedge/
4.Update the configuration to add the new components in your image.
- Add DISTRO_FEATURES_append = "virtualization" into [your STM32MP1 Distribution path]/layers/meta-st/meta-st-openstlinux/conf/distro/openstlinux-weston.conf
- Add IMAGE_INSTALL_append += "iotedge-daemon iotedge-cli libiothsm-std docker docker-contrib connman connman-client" into [your STM32MP1 Distribution path]/build-openstlinuxweston-stm32mp1/conf/local.conf
- Change ROOTFS_PARTITION_SIZE = "763904" to ROOTFS_PARTITION_SIZE = "2097152" in[your STM32MP1 Distribution path]//layers/meta-st/meta-st-stm32mp/conf/machine/include/st-machine-common-stm32mp.inc file
- Add CONFIG_EXT4_FS_SECURITY=y into [your STM32MP1 Distribution path]/layers/meta-st/meta-st-stm32mp\recipes-kernel/linux/linux-stm32mp/4.19/fragment-03-systemd.config
3.1 Image build and flash
Go the article STM32MP1_Distribution_Package for the details about the process to build and flash your image.
To build the image:
In the folder [your STM32MP1 Distribution path]/build-openstlinuxweston-stm32mp1 Execute the command:
PC $>bitbake st-image-weston
4 Execution of the Azure IoT Edge demonstration
1.Update of the IoT Edge configuration file on the board
vi /etc/iotedge/config.yam update hostname example with "stm32mp1"
2. Follow the process described on the Microsoft Azure  website