Chilipeppr/Jscut/GRBL

Hi, I have bought the MPCNC hardware (Ramps 1.4 (Arduino mega, 3 drv8825 drivers , shield))… And on last months I have been working with Marlin software and Repetier Host software, as mschrock, my purpose is to use it like CNC and not like 3D printer. I would be very interested in use GRBL and chilipeppr mainly for auto-level and software environment.
I have been trying to use as mschrock on (https://www.v1engineering.com/forum/topic/grbl-for-ramps-1-4/) the GrblforCyclone, I have followed the git readme and I could upload the software on Arduino mega. I have been trying to use GRBL in Repetier Host and in Chilipeppr using the json port connection but not success.
Does anyone know what I’m doing wrong? Some ideas would be great!