anchor.diff:  
   
   
  -### Retrieve a service [GET]
  -
  -With Fiware-ServicePath you can retrieve a subservice or all subservices.
  +### Retrieve a service group [GET]
  +
  +With Fiware-ServicePath you can retrieve a service group.
   
   + Parameters [limit, offset, resource]
   
  
positive.code:             }
  
  ### Update a device [PUT]
  If you want modify only a field, you can do it, except field `protocol` (this field, if provided it is removed from request).
  
  + Request (application/json)
  
negative.code: 
  + Response 204
  
  ### Remove a service group [DELETE]
  
  You remove a subservice into a service. If Fiware-ServicePath is '/*' or '/#' remove a service group.
  
  + Parameters [apikey, resource, device]
  
  