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Resolve does not have a Mercury Transmit equivalent, so the picture is picked up by an OpenFX effect instead. Where you place that effect decides what ends up on the stream, and the timeline node is the place that covers everything.
This needs DaVinci Resolve Studio. The free version does not load OpenFX plugins from other vendors.

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Install the plugin

Open Settings in dfine.io Desktop, go to Plugin Sources, and install the Resolve plugin. macOS will ask for your password, because OpenFX plugins live in a system folder. Then quit Resolve and start it again so it picks the plugin up.

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Add the effect to the timeline node

The Color page has two node levels. Clip works on the shot under the playhead, Timeline works on the finished programme. You want Timeline, otherwise the stream only carries the one shot you happened to be on.
1

Open the Color page

Switch to the Color page and open the Library panel on the right, where the OpenFX effects live.
The DaVinci Resolve Color page with the OpenFX Library panel open on the right
2

Switch the node graph to Timeline

Above the node graph, change the mode from Clip to Timeline. Then type dfine into the library search. dfine.io Transmit appears.
The node graph switched to Timeline mode with dfine.io Transmit found in the effects library
3

Drag it into the node graph

Pull dfine.io Transmit from the library into the empty node graph.
Dragging the dfine.io Transmit effect from the library into the node graph
4

Check that the node is live

The node now sits between input and output, and the Settings tab shows dfine.io Transmit switched on.
The dfine.io Transmit node applied in the timeline node graph with the effect enabled in Settings

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Check that it arrives

Play the timeline in Resolve, then switch to the Ingest tab in dfine.io Desktop. The preview shows your picture and the source is listed as connected. Press Start to go live.

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Sound is a separate step

The effect you just added carries picture only. Resolve keeps video and audio in different parts of the application, so sound needs its own effect on the Fairlight page.

Activate audio in DaVinci Resolve

Add the dfine.io Transmit audio effect to the Main bus so your mix reaches the stream.

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When nothing arrives

Resolve was running during the install. Quit it completely and start it again. You are on the free version. OpenFX plugins from other vendors need Resolve Studio. The node sits on Clip instead of Timeline. Then only the current shot is transmitted. Switch the graph to Timeline and add the effect there. Nothing is playing. Press play in Resolve. Without playback there are no frames to send.