Since I’m now triggered, I started doing some tests.
After initial startup on VenusOS v3.64, the node status in the flow below (part of a bigger flow but the rest doesn’t seem relevant) is green and “connected”, but the injected value isn’t displayed - seems the node input remains in tri-state.
The injection is done once after 0.5 seconds.
Toggling the “MPPT enable” slider Off (input 4 to the node) results in proper node behavior and all works fine from then on.
Re-deploying the flow results in the “Not connected to dbus. Publish was unsuccessful” message.
After toggling the slider the node works as expected.
When deploying the same flow on v3.63, the MPPTs box very briefly shows “disconnected”, then almost immediately goes green with the injected value.
“Quick analysis” seems to point to a timing / initialization hickup between Node Red and dbus in v3.64.