[BUG] Incoming messages' payload are not parsed into objects

[nightknighto]

Describe the bug.

I am trying out generating a template for the example mqtt document . I was testing the subscribe function registerReceiveLightMeasurementMiddleware and it seems that the message's payload is not parsed from string to object, it stays as string. There is also no validation.

I can't also parse it manually either, it will give an error due to it not being a valid JSON object string.

Expected behavior

1- message.payload should be parsed into an object, respecting that the type is specified to object in the asyncapi document.
2- There should be validation for the payload.

Screenshots

How to Reproduce

1- Copy the linked AsyncAPI document to a new folder.
2- Generate a nodejs template from the file.
3- Copy the example script, add to the callback of client.registerReceiveLightMeasurementMiddleware: console.log(typeof message.payload).
4- Try it out, for example: npx mqtt pub -t 'smartylighting/streetlights/1/0/event/101/lighting/measured' -h 'test.mosquitto.org' -m '{"id": 1, "lumens": 3}'
5- It will output string. You also can't use JSON.parse to parse it. There is also no validation to the message, you can send anything.

🖥️ Device Information [optional]

No response

👀 Have you checked for similar open issues?

• I checked and didn't find similar issue

🏢 Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to work on this issue ?

None

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