RX Buffer commands filtration
Add AND gates on ALL commands which are applied on RX Buffer. Use outcome of Message filter as second input to AND gate. Note that first command comes at the end of control field when ID is already received and Mesage filter output is evaluated! All commands are thus applied when Message filter contains valid values (even rec_abort). rec_ident_in is erased only in SOF and data are invalid between SOF and ID reception. There are no Commands during this time.