#!/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 import traceback # from current dir from transmit_path import transmit_path from receive_path import receive_path global sync_status,mode sync_status=False mode = "sync" #default mode of operation... 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,ch,traffic_flag def main(): global n_rcvd, n_right,sync_status,sync_pktno,ch,mode,traffic_flag sync_pktno =0 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,sync_pktno,ch,mode,traffic_flag #(pktno,) = struct.unpack('!H', payload[0:2]) print "inside rx callback" ########################## sync ########################### if mode == "sync": if ok == True: (sync_signal,) = struct.unpack('!s', payload[2]) (sync_signal_red,) = struct.unpack('!s', payload[3]) #redundant sync bit (data_channel,) = struct.unpack('!s', payload[4]) (data_channel_red,) = struct.unpack('!s', payload[5]) #redundant channel bit print "printing the elements of packet ",str(sync_signal)," !!!!!!!!!!! ",str(sync_signal_red)," !!!!!\n" print "printing the channel ",str(data_channel_red)," !!!!!!!!!!! ",str(data_channel_red)," !!!!!\n" #if str(sync_signal) == 's' and str(sync_signal_red) == 's' and str(data_channel) == str(data_channel_red): if str(data_channel) == str(ch): #print "inside if" sync_status = True #tb.stop() #print "received a sync packet on channel %s\n" %(data_channel) data = str('o'+'o'+str(data_channel)+str(data_channel)) #print "sending this data",data,"@@@@@\n" #sync_pktno=0 ack_payload = struct.pack('!H', sync_pktno & 0xffff) + data sync_pktno+=1 #print "printing ack packet and sent pkt no ",ack_payload," ",sync_pktno,"\n" #print "printing the 3rd byte ",struct.unpack('!s', ack_payload[2]) ," \n" #k=0 #while k < 10000: #print "inside while" send_pkt(tb,ack_payload) #sending back the acknowledgement #k=k+1 print "ok = %5s sync_pktno = %4d n_rcvd = %4d n_right = %4d" % ( ok, sync_pktno, n_rcvd, n_right) ##################################################### ######################### traffic ############################ if mode == "traffic": (data_header,) = struct.unpack('!s', payload[0]) if ok and data_header == 'd': traffic_flag = True comm = struct.unpack('!14s', data) print("received this ", comm) ############################################################## 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 "ok = %5s n_rcvd = %4d n_right = %4d" % ( # ok, 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) 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" #tb = my_top_block(mods[options_tx.modulation], options_tx) #r = gr.enable_realtime_scheduling() #if r != gr.RT_OK: # print "Warning: failed to enable realtime scheduling" #setting up rx options parser # Create Options Parser: 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) 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" #options_rx.decim=128 #setting the decimation for receive path # 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" print "printing the decimation ",options_rx.decim,"\n" tb.start() #listening to random frequencies untill a match is found running = True global ch while running: ################################################sync mode#################################### if mode == "sync": if sync_status != True: #print "inside while" #ch = random.randint(1, 7) ch = int(random.choice('17')) #ch = random.randint(6, 12) #ch = 1 #hop_freq = float(1e6 * (400+(ch-1)*10))#setting the centre freq frequency for sending packets hop_freq = float(1e6 * (462.5625+(ch-1)*0.025)) #hop_freq = float(1e6 * (462.5625+(5-1)*0.05)) print "hop freq is",hop_freq,"@@@@\n" tb.txpath.set_freq(hop_freq) tb.rxpath.set_freq(hop_freq) time.sleep(0.05) #time.sleep(2) else: print "inside lese of while check" check_sync == 0 print "sync channel is found! and it is channel ",ch," \n" mode = "traffic" #tb.stop() #break #temp_variable = 2 #if temp_variable == 2: # print "success" ################################################end of sync mode#################################### ################################################Communications mode#################################### if mode == "traffic": print "Inside traffic mode" if check_sync == 0 time.sleep(0.4) if traffic_flag != True: mode = "sync" continue else: check_sync == 1 nbytes = 15 pkt_size = 15 sync_pktno = 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(0.1) tb.rxpath.min_freq = hop_freq - 80e3 tb.rxpath.max_freq = hop_freq + 80e3 is_present = tb.rxpath.get_spec_stats(1e13,10) #check if primary user is present if is_present == True: #if primary user is present then get out of this communication channel, back to sync mode. mode = "sync" ################################################ end of Communications mode#################################### #var2 = 2 #if var2 ==2: # print "just checking this bug" # generate and send packets #print "printing megamytes",options_tx.megabytes," $$$$\n" #myfile = file("log.txt", 'w') #traceback.print_tb(traceback,None,myfile) #tb.wait() #tb.stop() if __name__ == '__main__': try: main() except KeyboardInterrupt: pass