thanks toby. Ok i shall do it . Can i rename the example driver.cc to  relay.cc in my own directory. if not than if i want to make another driver than what shall  i  do? Because  i  need to make  another 2/3 driver for  my robot.  if i rename than do i need to change the driver registry.cc and put it  in my directory.

best regards

ASM Hoque

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