JsonBuffer::parse() doesn't respect nesting limit properly

Created by: Adam5Wu

Thanks for the great library! It saves me so much time and headache. :)

However, I am encountering some difficulties using the parse method for a slightly different purpose. I am trying to write a utility which accepts user input and update json accordingly.

For example:

• Original json: { "Test": "abc" }
• User input: Test="def"
• My logic intends to do the following:
  1. Parse input string and obtain the key Test and value "def"
  2. Use ArduinoJson to parse the value "def" into a JsonVariant, make sure user indeed provide a simple string, not a json object or array
  3. Assign the parsed JsonVariant to the original json with the given key
• Expected new json: { "Test": "def" }

However, I am stuck on step 2, because when I call jsonBuffer.parse("\"def\"", 0) the result always fail. Reading the document, I suspect the parse method can only accept serialized json object or array, not a simple value, such as boolean, integer, or string. Am i missing anything?

Note that since the utiltiy is general purpose, I cannot know ahead of time which field is which type, I think it is a perfect case to utilize the parser and JsonVariant to achieve this goal and keep the code simple and elegant.