Controlling RFXTRX blind with LUA

I’ve seen this question posted elsewhere in the forum but couldn’t find an answer.
But I have made it work - to close a blind using LUA I’ve used

luup.call_action("urn:upnp-org:serviceId:Dimming1", "SetLoadLevelTarget", {newLoadlevelTarget = 0}, dev_id)

and to open it you set newLoadlevelTarget = 1 (or any non-zero value it seems)

if there is a any documentation that describes this or there is a better way then please share.

Thanks

PS - this is on UI5

luup.call_action(“urn:upnp-org:serviceId:WindowCovering1”, “Up”, {}, dev_id)
luup.call_action(“urn:upnp-org:serviceId:WindowCovering1”, “Down”, {}, dev_id)
luup.call_action(“urn:upnp-org:serviceId:WindowCovering1”, “Stop”, {}, dev_id)

Brilliant! yes that is a better way.

Thank you.