Inject Node (Flow Graph)
Type: Flow Control
Compatible with: Flow Graph
Description:
The Inject Node is a versatile tool for initiating flows or introducing data at specific intervals within a Flow Graph. It allows you to manually trigger events or set up automatic injections based on intervals or cron schedules. The payload of the injected message can be a variety of types, including strings, numbers, objects, or even dynamically generated data.
Settings Parameters:
- Payload:
- Type: Select the data type of the payload (e.g., String, Number, JSON).
- Value: Enter the actual payload data or a valid expression for the selected type.
- Topic: (Optional) Specify a topic for the injected message (useful for filtering in other nodes).
- Repeat:
- Interval: Inject messages at regular intervals.
- Cron: Inject messages based on a cron schedule.
- None: Inject only once when manually triggered or at the start of the flow (if configured).
- Interval/Cron Configuration: If using "Interval" or "Cron," configure the interval duration or cron expression accordingly.
Input:
- (None) The Inject Node does not have any input connections.
Output:
msg: The message object with the defined payload and topic.
Example Usage:
- Configure Payload: Choose the data type and enter the payload value.
- Set Repeat Mode: Select "Interval," "Cron," or "None" depending on your injection requirements.
- Configure Interval/Cron: If applicable, set the interval duration or cron expression.
- Connect Node: Connect the output of the Inject Node to the input of another node in your flow.
- (Optional) Manual Trigger: In debug mode, click the button on the node to manually inject a message.
Tips:
- Use the Inject Node to simulate sensor data, trigger specific actions, or start complex sequences of events.
- The flexibility of the payload type allows you to inject a wide range of data, from simple values to complex objects.
- Experiment with different repeat modes to create dynamic and responsive behaviors in your robot applications.