256 character limit for all OpMode names

[gorpong]

A team I mentor ran into a situation today with none of their OpModes showing up in the selector list on the Driver Station. Through the process of elimination (and the help of logcat), I was able to isolate the cause: there's a 256 character maximum size for the names of all of the OpMode's that are displayed in the drop-down list on the driver station. The specific output in logcat was:

10-24 17:13:50.761 I/FIRST   (19575): Processing Command: CMD_REQUEST_OP_MODE_LIST
10-24 17:13:50.761 E/RobotCore(19575): Event loop threw an exception while processing a command
10-24 17:13:50.761 E/RobotCore(19575): java.lang.IllegalArgumentException: command extra data length is too long (MAX: 256)
10-24 17:13:50.761 E/RobotCore(19575): com.qualcomm.robotcore.robocol.Command.<init>(SourceFile:90)
10-24 17:13:50.761 E/RobotCore(19575): com.qualcomm.ftccommon.FtcEventLoop.b(SourceFile:183)
10-24 17:13:50.761 E/RobotCore(19575): com.qualcomm.ftccommon.FtcEventLoop.processCommand(SourceFile:161)
10-24 17:13:50.761 E/RobotCore(19575): com.qualcomm.robotcore.eventloop.EventLoopManager.d(SourceFile:652)
10-24 17:13:50.761 E/RobotCore(19575): com.qualcomm.robotcore.eventloop.EventLoopManager.d(SourceFile:60)
10-24 17:13:50.761 E/RobotCore(19575): com.qualcomm.robotcore.eventloop.EventLoopManager$c.run(SourceFile:171)
10-24 17:13:50.771 E/RobotCore(19575): java.lang.Thread.run(Thread.java:841)

If you find that you have a lot of OpModes and suddenly your DS doesn't display any of them but you have no other errors anywhere, check to make sure your names aren't too long and/or shorten some names by removing underscores or spaces you might have in their names.

I hope this saves someone some troubleshooting time!

-- Gordon.

[Philbot]

A team I mentor ran into a situation today with none of their OpModes showing up in the selector list on the Driver Station. Through the process of elimination (and the help of logcat), I was able to isolate the cause: there's a 256 character maximum size for the names of all of the OpMode's that are displayed in the drop-down list on the driver station. T

If you find that you have a lot of OpModes and suddenly your DS doesn't display any of them but you have no other errors anywhere, check to make sure your names aren't too long and/or shorten some names by removing underscores or spaces you might have in their names.

-- Gordon.

To clarify... this is a problem if the total length of all the opmode names combined are greater than 255 chars (not just a single name limit) ?

Phil.

[gorpong]

To clarify... this is a problem if the total length of all the opmode names combined are greater than 255 chars (not just a single name limit) ?

Phil.

Hmmm, good question, but my guess is even if you have a single opmode name that's > 255 characters you're going to be in trouble. If there's a problem with the total adding up, I don't know why you wouldn't also have trouble with a single one that's > 255, but I didn't actually test this. I don't even know what the DS would do with a single opmode name that was that long. I wonder if there's an implicit truncation on each name itself (whatever fits on the width of the ZTE Speed in portrait mode, perhaps?).

[dmssargent]

If each name plus a record separator char plus the null terminating byte is converted to UTF-8 and is greater than 255 bytes, this error is thrown.