How to describe this POST JSON request body in OpenAPI (Swagger)?

I made it work with:

    post:
      consumes:
        - application/json
      produces:
        - application/json
        - text/xml
        - text/html
      parameters:
        - name: body
          in: body
          required: true
          schema:
            # Body schema with atomic property examples
            type: object
            properties:
              testapi:
                type: object
                properties:
                  messageId:
                    type: string
                    example: kkkk8
                  messageDateTime:
                    type: string
                    example: '2014-08-17T14:07:30+0530'
              testapiBody:
                type: object
                properties:
                  cameraServiceRq:
                    type: object
                    properties:
                      osType:
                        type: string
                        example: android
                      deviceType:
                        type: string
                        example: samsung555
            # Alternatively, we can use a schema-level example
            example:
              testapi:
                testapiContext:
                  messageId: kkkk8
                  messageDateTime: '2014-08-17T14:07:30+0530'
                testapiBody:
                  cameraServiceRq:
                    osType: android
                    deviceType: samsung555