inject

Fires once, with a fixed payload, when you click its "▶" icon while connected to a board. Click anywhere else on the node to open its property panel instead.

Properties

• payload type — bool, number, or string.
• value — the fixed value to send, matching the chosen type.

Behavior

The "▶" icon and the rest of the node are two separate click targets. The icon fires — only while live-connected, and only that one message; there's no periodic firing and no automatic fire-at-boot. The node body opens the property panel, live or not, so you can edit a flow's inject values without disconnecting first. A freshly deployed flow with only inject sources does nothing until you click one. To send a message automatically when the flow starts, use startup.