ENH: USER_K message type filter
TODO: Test on KC705
USER_K packets are only passed to the readout, if the header matches one of the three programmable masks. Example: ['rx'].set_USER_K_FILTER_MASK_1(0x01) The default values are set to pass the register readback packets.
['rx'].set_USER_K_FILTER_EN(True) has to be set in order to use the filter.
Edited by Michael Daas