AdvantageKit Constantly getting DataLog: Could not open log file

Nek · January 20, 2024, 1:17am

Recently whenever we run our robot, we’ve been getting spammed with the following errors

and are unsure of what’s the cause of it.

Andy_H · January 20, 2024, 1:23am

Throwing a usb thumb drive in the rio should stop the errors and let AdvantageKit save the log files to the default location

Nek · January 20, 2024, 1:33am

Ah, alright, that makes a little more sense now. Thank you!

dkavner · January 22, 2024, 1:38am

While this solution works, we would like the option to run our robot without a USB stick without getting spammed. This was possible on 2023. How do we do it on 2024?

Joe_Ross · January 22, 2024, 2:12am

If you don’t want to use the default location, you can use one of the other WPILOGWriter constructors that lets you specify the log path.

github.com

Mechanical-Advantage/AdvantageKit/blob/4c2785d30c61097655b5ad899e200e0c3f8801c3/example_projects/skeleton/src/main/java/frc/robot/Robot.java#L65


      
              break;
            default:
              Logger.recordMetadata("GitDirty", "Unknown");
              break;
          }
          
          // Set up data receivers & replay source
          switch (Constants.currentMode) {
            case REAL:
              // Running on a real robot, log to a USB stick ("/U/logs")
              Logger.addDataReceiver(new WPILOGWriter());
              Logger.addDataReceiver(new NT4Publisher());
              break;
          
            case SIM:
              // Running a physics simulator, log to NT
              Logger.addDataReceiver(new NT4Publisher());
              break;
          
            case REPLAY:
              // Replaying a log, set up replay source

It’s probably not smart to log to the roborio 1’s flash.

dkavner · January 22, 2024, 6:20am

We are using roboRIO 1s. However, your post gave me the solution. We just need to bypass the addDataReceiver(new WPILOGWriter()) call if there is no USB stick present. We sometimes run without the stick when we’re using the real-time data feed to AdvantageScope.