#!/usr/bin/env python #Transmission and reception, one ata a time on the same antena from gnuradio import gr, gru, modulation_utils from gnuradio import eng_notation from gnuradio.eng_option import eng_option from optparse import OptionParser from numpy import random import random, time, struct, sys, math # from current dir from transmit_path import transmit_path from receive_path import receive_path global sync_status,mode,traffic_flag,ch sync_status="False" mode = "sync" #default mode traffic_flag = False class my_top_block(gr.top_block): def __init__(self, mod_class, demod_class, rx_callback, options_tx,options_rx): gr.top_block.__init__(self) self.rxpath = receive_path(demod_class, rx_callback, options_rx) self.txpath = transmit_path(mod_class, options_tx) self.connect(self.txpath); self.connect(self.rxpath); #//////main////// global n_rcvd, n_right def main(): global n_rcvd, n_right,sync_status,mode,ch,traffic_flag n_rcvd = 0 n_right = 0 def send_pkt(self, payload='', eof=False): return self.txpath.send_pkt(payload, eof) def rx_callback(ok, payload): global n_rcvd, n_right,sync_status,mode,ch,traffic_flag ########################## sync ########################### if mode == "sync": if ok == True: (pktno,) = struct.unpack('!H', payload[0:2]) (sync_signal,) = struct.unpack('!s', payload[2]) (data_channel,) = struct.unpack('!H', payload[3:5]) print "printing the elements of packet ",sync_signal," !!!!!!!!!!! ",data_channel," !!!!!\n" if str(sync_signal) == 's' and str(data_channel) == str(ch): sync_status = "True" print "received a sync packet on channel %s\n" %(data_channel) data = 'o' pktno=0 ack_payload = struct.pack('!HsH', pktno & 0xffff,data,ch & 0xffff) #+ data send_pkt(tb,ack_payload) #sending back the acknowledgement ##################################################### ######################### traffic ############################ if mode == "traffic": if ok: (data_header,) = struct.unpack('!s', payload[0]) if data_header == 'd': traffic_flag = True comm = struct.unpack('!14s', payload[1:15]) print("received this ", comm) data = 'dI am fine.....' #Sending this message payload = struct.pack('!15s', data) send_pkt(tb,payload) ############################################################## n_rcvd += 1 if ok: n_right += 1 #print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( # ok, pktno, n_rcvd, n_right) #print "sync_status is ",sync_status," @@\n" mods = modulation_utils.type_1_mods() #print "printing mods",mods,"$$$$\n" demods = modulation_utils.type_1_demods() #setting up the tx options parser parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve") expert_grp_tx = parser_tx.add_option_group("Expert_tx") #print "printing Expert_tx group",expert_grp_tx,"printing Expert_tx group" parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(), default='gmsk', help="Select modulation from: %s [default=%%default]" % (', '.join(mods.keys()),)) parser_tx.add_option("-s", "--size", type="eng_float", default=1500, help="set packet size [default=%default]") parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0, help="set megabytes to transmit [default=%default]") parser_tx.add_option("","--discontinuous", action="store_true", default=False, help="enable discontinous transmission (bursts of 5 packets)") parser_tx.add_option("","--from-file", default=None, help="use file for packet contents") print "printing parser_tx",parser_tx,"printing parser_tx" transmit_path.add_options(parser_tx, expert_grp_tx) for mod in mods.values(): mod.add_options(expert_grp_tx) (options_tx, args_tx) = parser_tx.parse_args () if len(args_tx) != 0: parser_tx.print_help() sys.exit(1) ############# Setting some default values for tx side of the block options_tx.tx_freq = 470e6#462.5625e6 options_tx.samples_per_symbol = 2 options_tx.modulation = 'dbpsk' options_tx.fusb_block_size = 4096 options_tx.fusb_nblocks = 16 options_tx.bitrate = 0.0125e6 ############# if options_tx.tx_freq is None: sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") parser_tx.print_help(sys.stderr) sys.exit(1) if options_tx.from_file is not None: source_file = open(options_tx.from_file, 'r') print "printing modulation type",mods[options_tx.modulation],"**" # build the graph print "printing tx options",options_tx,"&&&&\n" parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve") print "printing parser_rx",parser_rx,"!!!!!\n" print "after option parser" expert_grp_rx = parser_rx.add_option_group("Expert_rx") print "printing expert group rx",expert_grp_rx,"@@@@\n" parser_rx.add_option("-m", "--modulation", type="choice", choices=demods.keys(), default='gmsk', help="Select modulation from: %s [default=%%default]" % (', '.join(demods.keys()),)) print "inside rx option parser" receive_path.add_options(parser_rx, expert_grp_rx) for mod in demods.values(): mod.add_options(expert_grp_rx) (options_rx, args_rx) = parser_rx.parse_args () if len(args_rx) != 0: parser_rx.print_help(sys.stderr) sys.exit(1) ############# Setting some default values for rx side of the block options_rx.rx_freq = 470e6#462.5625e6 #setting default rx_freq value options_rx.samples_per_symbol = 2 options_rx.modulation = 'dbpsk' options_rx.fusb_block_size = 4096 options_rx.fusb_nblocks = 16 options_rx.bitrate = 0.0125e6 ############# if options_rx.rx_freq is None: sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") parser_rx.print_help(sys.stderr) sys.exit(1) print "printing rx options",options_rx,"&&&&\n" # build the graph tb = my_top_block(mods[options_tx.modulation], demods[options_rx.modulation], rx_callback,options_tx, options_rx) r = gr.enable_realtime_scheduling() if r != gr.RT_OK: print "Warning: failed to enable realtime scheduling" tb.start() #tb.rxpath.disconnect(tb.rxpath.u, tb.rxpath.s2v,tb.rxpath.fft, tb.rxpath.c2mag, tb.rxpath.stats) #tb.rxpath.connect(tb.rxpath.u, tb.rxpath.s2v) #listening to random frequencies untill a match is found running = True global ch while running: ################################################sync mode#################################### if mode == "sync": #sync_status="False" if sync_status != "True": #print "inside while" ch = int(random.choice([1,7,8,14])) if ch < 8: hop_freq = float(1e6 * (462.5625+(ch-1)*0.025))#setting the centre freq frequency for sending packets else: hop_freq = float(1e6 * (467.5625+(ch-8)*0.025))#setting the centre freq frequency for sending packets #print "hop freq is",hop_freq,"@@@@\n" tb.txpath.set_freq(hop_freq) tb.rxpath.set_freq(hop_freq) ch_energy = tb.rxpath.probe.level() #check if primary user is present #if int(ch_energy) > 1.0e7: print "hop freq is ",hop_freq," and channel energy is ",ch_energy,"\n" if int(ch_energy) > 2e7: #if primary user is there then dont transmit on this channel continue time.sleep(0.1) else: print "sync channel is found...channel ",ch,"\n" check_sync = 0 mode = "traffic" traffic_flag = False sync_status="False" continue ################################################end of sync mode#################################### ################################################Communications mode#################################### if mode == "traffic": print "Inside traffic mode" if check_sync == 0: time.sleep(0.8) if traffic_flag != True: mode = "sync" continue else: check_sync = 1 #nbytes = 15 #pkt_size = 15 #sync_pktno = 0 #n =0 #while n < nbytes: #print >> myfile, "inside while" # if options_tx.from_file is None: #data = (pkt_size - 2) * chr(data_pktno & 0xff) #0xff is 255 # data = 'dI am fine.....' #Sending this message #print >> myfile, data #print "printing data",data,"****\n" # else: # data = source_file.read(pkt_size - 2) # if data == '': # break; # # payload = struct.pack('!15s', data) #print "printing payload",payload,"**\n" # send_pkt(tb,payload) #print "printing payload",payload,"**\n" # n += len(payload) # sys.stderr.write('.') # if options_tx.discontinuous and data_pktno % 5 == 4: # time.sleep(1) # data_pktno += 1 # #print "before sleeping for 10 seconds and value of resend count is",resend_count time.sleep(0.2) ch_energy = tb.rxpath.probe.level() #check if primary user is present print "channel energy is ",ch_energy,"\n" if int(ch_energy) > 2e7: #if primary user is there then dont transmit on this channel mode = "sync" continue ################################################ end of Communications mode#################################### #tb.wait() if __name__ == '__main__': try: main() except KeyboardInterrupt: pass