Feature Req: Thermal Runaway System Snapshot

Greetings all- I had an instance of Thermal Runaway error overnight on a long print. When the system halted, no more data updated the tempgraph. Too much time had passes and the graph cache scrolled out of range so I don't know if the error was for overtemp or undertemp.

Logs only say-
"2018-09-01 10:19:38,195 - octoprint.util.comm - WARNING - Received an error from the printer's firmware: Thermal Runaway, system stopped! Heater_ID: 0"

Is it possible to take a snapshot of the tempgraph or get a dump/status on the terminal output at an occurrence like this? A little bit more information would go a long way to diagnosing the problem.

thanks in advance

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Was just reading this tutorial today and was wondering if it could do as you've requested.

  1. Presumably this would run from a script on your workstation rather than the Raspberry itself
  2. The "headless Chrome" session would visit the http://octopi.local/#temp page & tab and make a screencap of it
  3. Presumably, you'd setup an event handler by editing the config.yaml:
  enabled: True
  - event: Disconnected
    command: python ~/scripts/screencap.py ipAddressOfWorkstation
    type: system
    enabled: false

And then a script called screencap.py in this case would contact your workstation to make the snapshot.