 }
 
 
-// Register unwatch handler called when host requests to unwatch a register
-//
-int register_unwatch(int dev, int reg) {
-}
-
-
 // Arduino setup function executed once after reset
 //
 void setup() {

   // setup SRDP channel over serial
   //
   srdp_init_channel(&channel);
   channel.transport_write = transport_write;
   channel.transport_read = transport_read;
   channel.register_write = register_write;
   channel.register_read = register_read;

   // LED 1
   pinMode(PIN_LED1, OUTPUT);

            } else {
               return SRDP_ERR_INVALID_REG_POSLEN;
            }

         case IDX_REG_LED1:
         case IDX_REG_LED2:
         case IDX_REG_LED3:
            return SRDP_ERR_INVALID_REG_OP;

         default:
            return SRDP_ERR_NO_SUCH_REGISTER;
      }
