Message Sink gr_message_sink from gnuradio import gr gr.message_sink($type.size*$vlen, $(id)_msgq, $dont_block) Input Type type enum Complex complex size:gr.sizeof_gr_complex Float float size:gr.sizeof_float Int int size:gr.sizeof_int Short short size:gr.sizeof_short Byte byte size:gr.sizeof_char Don't Block dont_block False enum Don't Block True Block False Vec Length vlen 1 int $vlen > 0 in $type $vlen out msg