Define a parameter for both path and body (in different paths)

Hi SteMMo,

This is not possible in OpenAPI 2.0 - you'll need to refine the DeviceID type inline both in the path parameter and in the body parameter schema.

However, this is possible in OpenAPI 3.0 should you decide to convert your definition to the new spec version.

openapi: 3.0.0
...
paths:
  /root/{deviceId}/config:
    post:
      parameters:
      - in: path
        name: deviceId
        required: true
        schema:
          $ref: '#/components/schemas/DeviceID'
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RequestBodySchema'
      responses:
        '200':
          description: OK

components:
  schemas:
    DeviceID:
      type: string
      description: Generato a partire dal MAC address
      example: AABBCCEE

    RequestBodySchema:
      type: object
      properties:
        deviceID:
          $ref: '#/components/schemas/DeviceID'
        ...