Redundant messages

[smurfix]

What were you doing?

Printing on a Prusa+MMU and observing the MQTT messages.

What did you expect to happen?

No redundant messages.

What happened instead?

• An MMU-equipped Prusa doesn't have multiple hot ends, it has only one. Thus, please emit only one temperature event, not five identical ones for tool0…tool4.

• I get a message for each Z change, which unfortunately includes retractions. Would it be possible to limit that to actual layer changes?

Version of OctoPrint

current

Version of the MQTT plugin

0.8.6

Screenshot(s)/video(s) showing the problem

octoPrint/temperature/tool4 {"_timestamp": 1589452785, "actual": 234.8, "target": 235.0}
octoPrint/temperature/tool3 {"_timestamp": 1589452785, "actual": 234.8, "target": 235.0}
octoPrint/temperature/tool2 {"_timestamp": 1589452785, "actual": 234.8, "target": 235.0}
octoPrint/temperature/tool1 {"_timestamp": 1589452785, "actual": 234.8, "target": 235.0}
octoPrint/temperature/tool0 {"_timestamp": 1589452785, "actual": 234.8, "target": 235.0}
octoPrint/event/ZChange {"new": 8.896, "_event": "ZChange", "old": 7.896, "_timestamp": 1589452786}
octoPrint/event/ZChange {"new": 7.896, "_event": "ZChange", "old": 8.896, "_timestamp": 1589452786}
octoPrint/event/ZChange {"new": 8.896, "_event": "ZChange", "old": 7.896, "_timestamp": 1589452787}
octoPrint/event/ZChange {"new": 7.896, "_event": "ZChange", "old": 8.896, "_timestamp": 1589452788}
octoPrint/event/ZChange {"new": 8.896, "_event": "ZChange", "old": 7.896, "_timestamp": 1589452788}

[jneilliii]

This might be difficult as octoprint itself doesn't have a single nozzle, multiple extruder option in the printer profile itself does it? This plugin just reports what octoprint gives it, so maybe this should be more of a request to core octoprint, not this plugin.

[tedder]

OctoPrint and octoslack detect this. I'll fill you in soon.

[tedder]

Here it is. In the base OctoPrint, there's a setting in the UI for "shared nozzle", which handles 2-into-1 and MMU2-style nozzles:

And then in the plugin, you simply need to test for that:

if shared_nozzle and nozzle_number and nozzle_number != "0":
  # only show the first nozzle if they are 'shared'

[jneilliii]

Thanks @tedder didn't know that was there...