Event transformation fails during integration with external analytics platform in cciot-25

IoT Cisco IoT Cloud Connect
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1

We’re attempting to integrate Cisco IoT Cloud Connect cciot-25 with an external analytics platform, but event transformation is consistently failing during the data handoff. Events are being generated correctly within IoT Cloud Connect, but when they’re transformed for the external system, the transformation process errors out with data format mismatches.

The external platform expects events in a specific JSON schema with nested arrays for telemetry data, but our transformation rules aren’t producing the correct structure. We’re seeing a 95% transformation failure rate.

{
  "transformationStatus": "failed",
  "error": "schema validation failed: expected array, got object",
  "sourceEvent": "device_telemetry_001"
}

The integration documentation mentions event transformation capabilities, but the examples don’t cover complex nested structures. How do others handle event transformation for external integrations with strict schema requirements?

2

I’ve integrated with several external analytics platforms. The key is to use custom transformation scripts rather than the built-in transformation rules. The declarative rule system can’t handle complex schema conversions reliably. Write a JavaScript transformation function that explicitly builds the nested array structure your analytics platform expects. You can deploy custom transformations through the Integration module’s script editor.

3

Thanks for the array wrapping tip. I’m now using custom JavaScript transformations instead of the declarative rules. The transformation success rate improved to about 60%, but still seeing failures on events with multiple telemetry readings.

4

The “expected array, got object” error indicates your transformation is outputting single objects when the target schema requires arrays. Even if you’re only sending one telemetry reading, it needs to be wrapped in an array. Add array wrapping to your transformation output.