Stream Logs

[bluecamel]

Is there away to stream the logs, ideally from the CLI? Even if there's a way to make the web interface stream updates, that would be very helpful.

[justinIRBT]

If you are just looking for the ros2 logging messages printed from the robot application using RCLCPP_INFO, RCLCPP_WARN, etc.., you can subscribe to /rosout

[shamlian]

To add to this (pulling out of the thread below): you're right that messages about the networking setup won't come through the ROS 2 logs. In the mean time, navigating to /logs-raw in the browser might be slightly less annoying (since it just loads the raw file without the surrounding html).

[bluecamel]

Thanks, but I'm looking for the system logs that are available in the web interface. It looks like the logs are coming from a web socket, but they don't update in the browser (I've tried Firefox, chromium, Chrome, and Vivaldi), so I have to reload the page, wait for it to load, then scroll all the way down to see new lines.

[shamlian]

I understand why you're looking for this, now; no, I'm sorry that you're right -- messages about the networking setup won't come through the ROS 2 logs. In the mean time, navigating to /logs-raw/ in the browser might be slightly less annoying (since it just loads the raw file without the surrounding html). @alsora do you know if wheel enabled state should come through /rosout?

[alsora]

Yes, wheel enabled state and almost everything "robot related" goes thorugh /rosout.
(there are a bunch of low-level robot logs that only end up in the webserver logs, but they are not really useful for the users)

[bluecamel]

Gotcha, /logs-raw is definitely handy and I'll make sure to look at /rosout first in the future. Thanks so much for the info 🙏🏼

[bluecamel]

I understand why you're looking for this, now; no, I'm sorry that you're right -- messages about the networking setup won't come through the ROS 2 logs. In the mean time, navigating to /logs-raw/ in the browser might be slightly less annoying (since it just loads the raw file without the surrounding html). @alsora do you know if wheel enabled state should come through /rosout?

Sorry, I guess because this is in a thread, I can't mark it as the answer, I marked another response as the answer so that this can close.

[shamlian]

No problem; I added a comment on that answer you marked to give the other half (to look at /logs-raw).