Webhook for IoT events in IOT Protocols - Step-by-Step Execution

Process Flow - Webhook for IoT events

IoT Device sends event

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Event reaches IoT Platform

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Platform triggers Webhook

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HTTP POST sent to Webhook URL

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Webhook Receiver processes event

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Receiver sends response

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Platform logs success/failure

This flow shows how an IoT device event triggers a webhook call from the platform to a receiver URL, which processes the event and responds.

Execution Sample

IOT Protocols

POST /webhook HTTP/1.1
Host: example.com
Content-Type: application/json

{"device_id":"1234","temp":22.5}

An IoT platform sends a POST request with JSON data about a device event to a webhook URL.

Process Table

Step	Action	Data Sent	Receiver Response	Platform Status
1	IoT device sends event to platform	{"device_id":"1234","temp":22.5}	N/A	Event received
2	Platform triggers webhook POST	{"device_id":"1234","temp":22.5}	Waiting	Webhook call started
3	Webhook receiver processes event	{"device_id":"1234","temp":22.5}	200 OK	Webhook success logged
4	Platform logs webhook response	N/A	200 OK	Process complete

💡 Webhook call completes after receiver responds with 200 OK

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
event_data	{}	{"device_id":"1234","temp":22.5}	{"device_id":"1234","temp":22.5}	{"device_id":"1234","temp":22.5}	{"device_id":"1234","temp":22.5}
webhook_status	idle	idle	calling	success	success

Key Moments - 2 Insights

Why does the platform wait after sending the webhook POST?

The platform waits for the webhook receiver to respond (see execution_table step 2 and 3) to know if the event was processed successfully.

What happens if the webhook receiver does not respond with 200 OK?

The platform logs a failure or retries the webhook call, but this is not shown in this trace (see execution_table step 3 response).

Visual Quiz - 3 Questions

Look at the execution table, what is the webhook_status after step 2?

A idle

B calling

C success

D failed

💡 Hint

Check the variable_tracker row for webhook_status at After Step 2

At which step does the platform receive the webhook response?

A Step 1

B Step 2

C Step 3

D Step 4

💡 Hint

See execution_table column 'Receiver Response' for when 200 OK is received

If the device sent a different temperature, how would event_data change after step 1?

A It would update with the new temperature value

B It would remain empty

C It would become null

D It would cause an error

💡 Hint

Look at event_data changes in variable_tracker after Step 1

Concept Snapshot

Webhook for IoT events:
- IoT device sends event to platform
- Platform triggers HTTP POST webhook with event data
- Webhook receiver processes and responds
- Platform logs success or failure
- Webhook call is synchronous with response status

Full Transcript

This visual execution shows how an IoT device event triggers a webhook call. First, the device sends event data to the IoT platform. The platform then sends an HTTP POST request to a webhook URL with the event data in JSON format. The webhook receiver processes this data and responds with a status code, usually 200 OK if successful. The platform waits for this response and logs whether the webhook call succeeded or failed. Variables like event_data hold the event details throughout, and webhook_status tracks the call state. This step-by-step flow helps beginners see how webhook communication works in IoT event handling.