Interfacing with Mariner via CLI?

[daxliniere]

Is it possible to pass commands to and read states from Mariner via commandline? I think that should allow me to interface it with Node-RED, meaning I can set up all kinds of automation. (Including 'when print finishes, take photo and email it'!)

Node-RED's exec node allows you to execute commands at the command line level. I'm sure there's also a way to do that, then read the response. This would mean we wouldn't necessarily need a dedicated Mariner node (though it would certainly be slicker).

All the best!
Dax.

[luizribeiro]

I don't use Node-RED myself, but you should be able to have Node-RED talk to mariner over the web API. The API is mostly meant to be used by the frontend, so there's no guarantees of backwards compatibility. But there's nothing preventing it.

For example, if you want to check the print status, you can simply run a request like this:

$ curl http://iot-mariner:5000/api/print_status
{
  "progress": 0.0,
  "selected_file": "spool-part1.ctb",
  "state": "IDLE"
}

If you want to pause the print, you can run:

$ curl -X POST http://iot-mariner:5000/api/printer/command/pause_print

You can check the module mariner.server.api to see all the API endpoints that are available.

[luizribeiro]

I see in your first example that you needed to provide the name of the file being printed.

That is actually just an example output of the command from running it against my own printer :) That is what Node-RED will have to read.

Your second example is exactly what I was hoping for with start_print, so thank you very much for that. Does it require a filename to be supplied or is it the same function as pressing the Start Print button in the web interface?

You can probably start printing a file you would like by providing the filename like this:

curl -X POST 'https//<your ip address>:5000/api/printer/command/start_print?filename=somefile.ctb'

The only other thing I was hoping to access is remaining print time.

The first example should give you that if you hit /api/print_status while the printer is printing something.

Lastly, will the address always be http://iot-mariner:5000 or is that dependent on what I have named this Pi?

That depends on your network setup. iot-mariner is the hostname of my printer. You should use the ip address of yours or localhost if you're running the command from the same machine.

[daxliniere]

Thank you, Luiz! Can't wait to test this.

Side note: Node-RED has an HTTP Request node which can call http endpoints. That should make this a piece of cake, I think! Plus, I think I can just use the inspector in my browser to work out what the 'command' to push the Start button would be.
So exciting!!

[daxliniere]

You should use the ip address of yours or localhost if you're running the command from the same machine.

And yes, Node-RED will always be running on the same Pi-Zero as Mariner, so this is great to know.

[luizribeiro]

Sweet! Let us know how it goes :)

[daxliniere]