code: def activate_(self, n_buffer, image_dimensions, shmem_name):
          
          self.active = True
          self.image_dimensions = image_dimensions
          self.client = ShmemRGBClient(
              name            =shmem_name,
              n_ringbuffer    =n_buffer,   # size of ring buffer
              width           =image_dimensions[0],
              height          =image_dimensions[1],
              # client timeouts if nothing has been received in 1000 milliseconds
              mstimeout   =1000,
              verbose     =False
          )
          self.postActivate_()
docs: Shared mem info is given.  Now we can create the shmem client