How to set global from python plugin

achrn

What is the 'right ' way to set a global variable from a python routine running on the SBC?

At the moment I'm using something equivalent to

from dsf.connections import CommandConnection
cmd_con = CommandConnection(debug=True)
cmd_con.connect()

newvalue = 37
res = cmd_con.perform_simple_code('set global.foobar = ' + newvalue, async_exec=True)

Which works, but I wondered if there's a better way to get to write to the object model directly.

I note that there is patch_object_model(key: str, patch: str) in the dsf-python source, but it "May be used only in non-SPI mode", and there's set_object_model(property_path: str, value: str) but it is to "Set an atomic property in the object model" and I both don't actually know what it means by that, and can't make it do what I want -

cmd_con.lock_object_model()
cmd_con.set_object_model('global.foobar','123')
cmd_con.unlock_object_model()

for example gives me (inter alia)

send: {"command":"SetObjectModel","PropertyPath":"global:foobar","Value":"123"}
recv: {"result":false,"success":true}

which I think means the command successfully sent, but didn't do anything (the variable doesn't get the value).

I should probably confess that I'm using dsf-python-3.5.0rc2 on a 3.5.1 with bookworm DuetPi, so I might possibly be jumping the gun a bit.

chrishamm

@achrn Your first approach is fine. Instead of a simple code you can send a regular DSF G-code as well. SetObjectModel is reserved for the DuetPiManagementPlugin and for non-SPI mode (which I haven't tested in a while), so don't use that.