ber_tx.py

#!/usr/bin/python
#!/usr/bin/env python

from gnuradio import gr, digital, blocks
from math import pi

def main( ):
    fg = transmit_topblock(pi/8, sps=2)
    fg.start()
    while True:
        debug_data = fg.debug.data()
        if debug_data != ():
            fg.debug.reset()
            print debug_data

class transmit_topblock(gr.top_block):
    def __init__(self, watermark_angle, sps):
        gr.top_block.__init__(self)

        self.source = blocks.udp_source(gr.sizeof_char, "127.0.0.1", 12002)

        #self.modulator = digital.wbpsk_mod(angle=watermark_angle, samples_per_symbol=sps)

        # put the usrp sink here
        self.nullsink = blocks.null_sink(gr.sizeof_gr_complex)

        # for debugging
        self.debug = blocks.vector_sink_b( )

        # connect everything
        #self.connect(self.source, self.modulator, self.nullsink)
        self.connect(self.source, self.debug)



if __name__ == '__main__':
    main( )

blast_udp.py

#!/usr/bin/python

import socket

UDP_IP = "127.0.0.1"
UDP_PORT = 12002
MESSAGE = '\x23\x55\xaa'

print "UDP target IP:", UDP_IP
print "UDP target port:", UDP_PORT
print "message:", MESSAGE

sock = socket.socket(socket.AF_INET, # Internet
                     socket.SOCK_DGRAM) # UDP
sock.sendto(MESSAGE, (UDP_IP, UDP_PORT))