Incorrect line numbers after reset #1676

camnewnham opened this Issue Dec 29, 2016 · 5 comments


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3 participants

camnewnham commented Dec 29, 2016 edited

What were you doing?

Resetting the printer while idle or during single motions (not while printing), using the hardware button/LCD.

What did you expect to happen?

The printer would reset, and OctoPrint would not issue any immediate commands.

What happened instead?

Line numbers were not reset in OctoPrint, so the printer was requesting the incorrect data (ie.. OctoPrint was sending whatever it was previously at, eg. 59, but the printer had just been reset and hence was requesting line 1.) This occasionally meant that a sequence of incorrect commands were executed.

Branch & Commit or Version of OctoPrint

Version 1.3.0 (master branch)

Printer model & used firmware incl. version

Custom corexy. Repetier 1.0.0dev.

Browser and Version of Browser, Operating System running Browser


Link to octoprint.log


Link to contents of terminal tab or serial.log

Terminal 1 - requesting line that is no longer in the buffer
Terminal 2 - requesting and executing non-current commands after reset!!

Link to contents of Javascript console in the browser


Screenshot(s) showing the problem:

N/A - however testing different values for 'Max Consecutive Timeouts While Idle" had no effect..

I have read the FAQ.

nophead commented Dec 29, 2016

Yes it all worked a lot better when immediate commands were sent without line numbers.

foosel commented Jan 9, 2017 edited

@nophead I added an option explicitly for you to disable line numbers altogether ;) But they are necessary for a lot of printers out there to work reliably.

@camnewnham I'll look into it. It should hopefully suffice to simply send a reset line number command when a start is encountered during regular operation, since that usually indicates that the controller was reset. If that doesn't proof as sufficient though, my hands are tied - any externally triggered actions on the printer that don't produce some kind of feedback on the serial are nothing I can react to.

nophead commented Jan 9, 2017

@foosel, Thanks for that, but where is it? I can't find such an option in Version: 1.3.0 (master branch).

foosel commented Jan 9, 2017

@nophead you need to disable firmware detection and then set "Send a checksum with the command" to "Never":


That should do it hopefully.

nophead commented Jan 9, 2017

Got it, thanks very much.

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