18.05.1 Release Notes

Release Date: Jun 20, 2018

See Licenses to view Legato AF Licensing Information.

The following provides a summary of changes that have been made in the 18.05 Legato AF Release.

Download the source code and get started with building Legato AF.

18.05.01 Fixes

The following issues have been patched in 18.05.1:

  • A bug that was preventing kernel modules set to load: manual from starting when the dependant app starts is fixed.
  • A bug that caused files created in a sandbox to disappear after a reboot is fixed, files now persist after a reboot.

New Features

The following are the list of new features that have been added into the 18.05 Release:


Legato.io is now being served through https and a new url has been added [https://docs.legato.io]()https://legato.io. Please update your bookmarks, all old urls will be automatically redirected to https://docs.legato.io.

sdef Improvement

New features have been added to the System Definition .sdef to be able to set search paths within the sdef for modules the same way that you could already do with interfaces. You now have the ability to include the search path from within the sdef instead of having to provide it to mksys via the -s flag on the command line.

Dynamic Memory Allocation

le_mem_GetRefCount() has been added to the Dynamic Memory Allocation API to check the current reference count on an object.

Firmware Update

le_fwupdate_GetAppBootloaderVersion() has been added to the Firmware Update API and returns the bootloader version string.

Beta Features

The following features have been added to the 18.05 Release and are feature complete but are still in a testing phase. Please provide feedback for these features on our forums.

Kernel Modules

Kernel Modules functionality has been added to support dependencies between kernel modules and dependencies between kernel modules and apps/components. We have also included functionality into the kernel module feature to bundle other files with the kernel module sources and provide scripts to load and unload the kernel module from your target.

Before building kernel modules into your Legato System you may have to perform some extra toolchain setup steps.

Alpha Features

The following are the list of features that have been added into the 18.05 Release but are still being developed and should not be used on production targets. Please provide feedback for these features on our forums:

Multiple SIM Support

The framework now contains support for multiple embedded SIM profiles and the ability to switch between the multiple SIMs and be managed by a subscription management server such as AirVantage.

Fixed Issues

All development work is tagged in GitHub as "18.05.0". The list of changes and commit messages can be found on GitHub.

This is only the list of fixes for the Application Framework and Platform Services, for the list of changes in the Platform Adapters and AVC Service view the commits under the tag 18.05.0 in the individual repositories on GitHub.

Known Issues

Constraints and Limitations

Dev Machine Linux Version

To develop applications within the Legato Application Framework, a current supported Long Term Support version of Ubuntu Linux is required on your dev machine (or running in a virtual box on Windows). Ubuntu 16.04 is the current recommended version to use on your dev machine.

ECM-USB modem manager issue

Ubuntu 15.10 and newer has Modem Manager version 1.4.12-1ubuntu1 installed by default which conflicts with the ECM-USB driver when connecting a target. Modem manager may cause the Ubuntu Network Manager to crash on your host and/or your target device to become unavailable over USB.


  • NetworkManager crashing when plugging into your device over USB, or
  • The target device becomes inaccessible after 30 seconds.

Recommended Work Around:

Sierra Wireless Toolchain Install

There is currently an error with setting up the WP76XX and WP77XX toolchain and the toolchain only partially installs. The part of the script to install and setup the kernel headers does not run and produces the following errors:

scripts/kconfig/Makefile:36: recipe for target 'silentoldconfig' failed
make[2]: *** [silentoldconfig] Error 1
Makefile:546: recipe for target 'silentoldconfig' failed
make[1]: *** [silentoldconfig] Error 2
make: *** No rule to make target 'include/config/auto.conf', needed by 'scripts'.  Stop.

To resolve this remove the installed toolchain and reinstall with sudo privileges.

Example of setting up the toolchain for a 64bit dev machine and a WP76 module with product release 9:

$ rm -rf /opt/swi/y22-ext
$ sudo poky-swi-ext-glibc-x86_64-meta-toolchain-swi-ext-armv7a-neon-toolchain-swi-ext-2.2.3.sh