DLT is an open source trace and logging framework developed within the COVESA alliance. It consists of a daemon connected to user applications. A tool called "dlt viewer" is used to receive, display and sort the incoming messages. It is possible to control the logging of an application using the DLT API, e.g. limit or expand logging and send custom text commands.

dlt-daemon

dlt-daemon is a system daemon that gathers log messages from connected applications. It is possible to build and install the dlt-daemon from the following git repository:

https://github.com/COVESA/dlt-daemon.git

dlt_viewer

dlt_viewer is a Qt-based application to show and filter log messages collected by dlt-daemon. dlt_viewer is executed on a host machine and provides a graphical user interface with table-views of the incoming messages. dlt_viewer is able to handle connections to multiple target systems. The sources are available in the following git repository:

https://github.com/COVESA/dlt-viewer.git

The following screenshots show the dialogs to establish a connection to an ECU with a running dlt-daemon:

Create a new ECU, general settings

Create a new ECU, TCP configuration

After successfully connecting to the system where RAMSES is executed dlt_viewer will show applications and contexts that have been registered at dlt-daemon. The following window is located in the top left of dlt_viewer.

List of applications and their contexts

dlt_viewer arranges incoming messages in a table that can be filtered. Without any filters applied applied all messages from all contexts are sorted by their timestamp. The log table window is located at the right side in dlt_viewer. The following screenshot shows the output of some dlt log messages from a RAMSES renderer.

List of messages

The messages can be inspected using plugins. The 'Dlt Viewer Plugin' for example shows the message in different formats (binary, text, mixed).

Dlt Viewer Plugin