side effect of attribute cache value default mode when a polling is activated by bpm-web-server
force limaccdsetup to set attribute reading by device value, default is by cache value, SPEC doc on tango:
tango_io(dev, "source") - Returns the data source for dev. A value of 0 indicates data is read directly from the device. A value of 1
means data is read from the polling cache. A value of 2 indicates data is read from the cache or the device.
tango_io(dev, "source", value) - Sets the data source for dev. Allowed values are 0, 1 and 2, with meanings as described above.
in SPEC (or Tango client API) the default is 2, so set in limaccdsetup to 0.