WriteDeviceResource should not allow any datatype to be written to a String type field

[ajcasagrande]

Feature request

Affected Services [REQUIRED]

device-sdk-go
device-onvif-camera

Is this a regression?

Not sure

Description and Minimal Reproduction [REQUIRED]

🔥 Exception or Error

Send a json object to a string value type:

See the value converted into a string containing the value type of map:

See where the problem is coming from. value is of map type, but v was created by fmt.Sprint(value).

thus causing validation to pass:

🌍 Your Environment

Deployment Environment:

EdgeX Version [REQUIRED]:

Anything else relevant?

[cloudxxx8]

In this example, it looks like the resource value type is defined in String from the Device Profile, so the service treats it as a pure String field. If it's not string, users can define it as an object value type.
What is your expected behavior?
This can be an enhancement, not a but. Also, this could be validated in the Core Command service to make sure Device Service always receives right data type.

[ajcasagrande]

@cloudxxx8 correct, the resource value type is defined as String in the device profile. The expected behavior is to return a 400 error back to the user, as they passed in a json object.