17.11.0 Release Notes

Release Date: Dec 14, 2017

See Licenses to view Legato AF Licensing Information.

The following provides a summary of changes that have been made in the 17.11 Legato AF Release.

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

New Features

The following are the list of new features that have been added into the 17.11 Release:

AirVantage Improvements

Version 17.11.0 introduces further stability updates to the AirVantage Connector and underlaying Platform Adapters. The code changes provide stability to over-the-air downloads and installs, and improves the reliability of downloads and installs resuming after the device has lost power or has been rebooted.

Extended Idle-Mode Discontinuous Reception API (eDRX)

A new API, le_lpt.api, has been added to Modem Services allow developers to interact with functions to reduce power consumption and extend the sleep cycle when the device is idle or in low power mode.

eDRX features include the ability to:

  • Activate/deactivate eDRX.
  • Set/get the requested eDRX cycle value.
  • Get the network-provided eDRX cycle value.
  • Get the network-provided Paging Time Window.
  • Add/remove an event handler notifying if there is a change in the network-provided eDRX parameters.

eCall Improvements

Version 17.11 introduces bug fixes and stability improvements to the eCall service within Modem Services.

Fixed Issues

All development work is tagged in GitHub as "17.11.0". 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 17.11.0 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:

Open Issues

The following is the list of known issues that still exist in Legato 17.11.0 and are currently under investigation:

AT Commands

  • AT command WDSI will accept the invalid syntax "" and will return OK and not ERROR. (e.g.; "", "0" and "4447" should return an ERROR but returns OK). These "" values will be stored in memory causing further issues for subsequent commands.

AVC Service

  • Targets are not updating the AirVantage Server when they have completed a Firmware update. The firmware update may update the server when the next connection is opened, but targets will not open a connection to AirVantage when the update has completed.

Modem Service