UDP Source gr_udp_source from gnuradio import gr gr.udp_source($type.size*$vlen, $ipaddr, $port, $mtu) set_mtu($mtu) Output 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 IP Address ipaddr 127.0.0.1 string Port port 1234 int MTU mtu 1024 int Vec Length vlen 1 int $vlen > 0 out $type $vlen