Trigger Connector

Overview

The Trigger connector implements conditional logic using MXL (Meddle Expression Language).

Connector Type: MeddleTrigger

Direct Dispatch Mode

Send custom payload when condition is true:

{
  "type": "MeddleTrigger",
  "config": {
    "mode": "DirectDispatch",
    "condition": "temperature > 80 || pressure > 10",
    "payload": {
      "alert_type": "critical",
      "severity": "high",
      "message": "Threshold exceeded"
    }
  }
}

When condition is true, outputs the custom payload.

Passthrough Mode

Pass original data only when condition is true:

{
  "type": "MeddleTrigger",
  "config": {
    "mode": "Passthrough",
    "condition": "temperature > 25 && status == \"active\""
  }
}

When condition is true, passes the original payload through.

MXL Expressions

Comparison Operators

• > Greater than
• < Less than
• >= Greater than or equal
• <= Less than or equal
• == Equal
• != Not equal

Logical Operators

• && AND
• || OR

Examples

temperature > 80
pressure < 10
temperature > 80 && pressure < 10
humidity > 60 || temperature > 25
status == "active"
count != 0
temperature >= 20 && temperature <= 30

Use Cases

1. Alert on threshold violations
2. Filter data based on conditions
3. Route data conditionally
4. Implement business logic

Example: Temperature Alert

{
  "type": "MeddleTrigger",
  "config": {
    "mode": "DirectDispatch",
    "condition": "temperature > 80",
    "payload": {
      "alert": "high_temperature",
      "severity": "warning"
    }
  }
}

Best Practices

• Use Passthrough for filtering
• Use DirectDispatch for alerts and notifications
• Combine multiple conditions with && and ||
• Test conditions with various input values

Related Connectors

• Alert - Send notifications
• Filter - Simple key filtering
• MXL Reference - Complete MXL documentation