code: func (ble *BLE) Disconnect(deviceUuid xpc.UUID) {
  	uuid := deviceUuid.String()
  	msg := 32
  	if ble.utsname.Release >= "18." {
  		msg = 49
  	}
  	if p, ok := ble.peripherals[uuid]; ok {
  		ble.sendCBMsg(msg, xpc.Dict{"kCBMsgArgDeviceUUID": p.Uuid})
  	} else {
  		log.Println("no peripheral", deviceUuid)
  	}
  }
docs: // disconnect