G-Code to send a message over network
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Hi,
Is there a G-Code command that can send a message over the network? I want to put a command in my gcode to start a timelapse on a pi+camera on my network.
Thanks,
Roi -
There is M118, but I think it is still in development and should be available in one of the next release candidates for 1.21, AFAIK.
https://duet3d.dozuki.com/Wiki/Gcode#Section_M118_Send_Message_to_Specific_Target -
Network is the right way to do this… and, until that is working, an output pin on the Duet hardwired to an input pin on the Pi, and some well documented setup on both, and this could potentially work sooner...
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For example, per the documentation, on a duet WiFi board, and the labels on the expansion connector:
[[language]] Logical pin Signal name Expansion connector label Expansion connector pin number 60 CS5 CS5 50 61 CS6 E3_STOP 9 62 CS7 E4_STOP 14 63 CS8 E5_STOP 19Therefore,
[[language]] M42 P60 S0 M42 P60 S255 ```Should toggle expansion connector ping 50 to logic 0 and logic 1, respectively. -
On the Pi side, there are a couple of Octoprint plugins that read GPIO input and do something… but... not anything that directly "starts a timelapse capture".
One example of a plugin that reads GPIO and does something (pauses a print job) is "FilamentSensorReloaded". This is a very short plugin, and could be easily adapted, if there were timelapse interfaces. By the way, there are all kinds of interface calls in Octoprint documentation for dealing with rendered and un-rendered timelapse files, etc, etc. Just not one for STARTING a capture. It appears this is only possible by "Starting a Job", which is much more than we want.
Therefore, I'd suggest posting a question in Octoprint forums, the question being "What is the API call to start a video capture that later becomes a timelapse?" or similar.
Once that is clear, stringing this all together looks pretty simple.
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I decided to open a feature request (because I want this as well):
https://github.com/foosel/OctoPrint/issues/2450
Other who want this, please either add supporting comments on Github, and/or open discussions of this on various Octoprint forums and groups.
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FYI: I created a tool to take timelapse snapshots on every layer change: https://forum.duet3d.com/topic/6058/timelapse-pictures-videos-with-duet-and-webcam-on-layer-change
