1 | #!/usr/bin/env python |
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2 | #Transmission and reception, one ata a time on the same antena |
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3 | |
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4 | from gnuradio import gr, gru, modulation_utils |
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5 | from gnuradio import eng_notation |
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6 | from gnuradio.eng_option import eng_option |
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7 | from optparse import OptionParser |
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8 | from numpy import random |
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9 | import random, time, struct, sys, math |
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10 | import traceback |
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11 | # from current dir |
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12 | from transmit_path import transmit_path |
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13 | from receive_path import receive_path |
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14 | global sync_status,mode |
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15 | sync_status=False |
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16 | mode = "sync" #default mode of operation... |
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17 | class my_top_block(gr.top_block): |
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18 | |
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19 | def __init__(self, mod_class, demod_class, |
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20 | rx_callback, options_tx,options_rx): |
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21 | |
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22 | gr.top_block.__init__(self) |
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23 | self.rxpath = receive_path(demod_class, rx_callback, options_rx) |
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24 | self.txpath = transmit_path(mod_class, options_tx) |
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25 | self.connect(self.txpath); |
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26 | self.connect(self.rxpath); |
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27 | |
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28 | #//////main////// |
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29 | |
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30 | global n_rcvd, n_right,ch,traffic_flag |
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31 | |
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32 | def main(): |
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33 | global n_rcvd, n_right,sync_status,sync_pktno,ch,mode,traffic_flag |
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34 | sync_pktno =0 |
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35 | n_rcvd = 0 |
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36 | n_right = 0 |
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37 | def send_pkt(self, payload='', eof=False): |
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38 | return self.txpath.send_pkt(payload, eof) |
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39 | |
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40 | def rx_callback(ok, payload): |
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41 | global n_rcvd, n_right,sync_status,sync_pktno,ch,mode,traffic_flag |
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42 | #(pktno,) = struct.unpack('!H', payload[0:2]) |
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43 | print "inside rx callback" |
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44 | ########################## sync ########################### |
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45 | if mode == "sync": |
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46 | if ok == True: |
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47 | (sync_signal,) = struct.unpack('!s', payload[2]) |
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48 | (sync_signal_red,) = struct.unpack('!s', payload[3]) #redundant sync bit |
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49 | (data_channel,) = struct.unpack('!s', payload[4]) |
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50 | (data_channel_red,) = struct.unpack('!s', payload[5]) #redundant channel bit |
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51 | print "printing the elements of packet ",str(sync_signal)," !!!!!!!!!!! ",str(sync_signal_red)," !!!!!\n" |
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52 | print "printing the channel ",str(data_channel_red)," !!!!!!!!!!! ",str(data_channel_red)," !!!!!\n" |
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53 | #if str(sync_signal) == 's' and str(sync_signal_red) == 's' and str(data_channel) == str(data_channel_red): |
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54 | if str(data_channel) == str(ch): |
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55 | #print "inside if" |
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56 | sync_status = True |
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57 | #tb.stop() |
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58 | #print "received a sync packet on channel %s\n" %(data_channel) |
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59 | data = str('o'+'o'+str(data_channel)+str(data_channel)) |
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60 | #print "sending this data",data,"@@@@@\n" |
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61 | #sync_pktno=0 |
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62 | ack_payload = struct.pack('!H', sync_pktno & 0xffff) + data |
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63 | sync_pktno+=1 |
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64 | #print "printing ack packet and sent pkt no ",ack_payload," ",sync_pktno,"\n" |
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65 | #print "printing the 3rd byte ",struct.unpack('!s', ack_payload[2]) ," \n" |
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66 | #k=0 |
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67 | #while k < 10000: |
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68 | #print "inside while" |
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69 | send_pkt(tb,ack_payload) #sending back the acknowledgement |
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70 | #k=k+1 |
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71 | print "ok = %5s sync_pktno = %4d n_rcvd = %4d n_right = %4d" % ( |
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72 | ok, sync_pktno, n_rcvd, n_right) |
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73 | |
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74 | ##################################################### |
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75 | |
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76 | ######################### traffic ############################ |
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77 | if mode == "traffic": |
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78 | (data_header,) = struct.unpack('!s', payload[0]) |
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79 | if ok and data_header == 'd': |
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80 | traffic_flag = True |
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81 | comm = struct.unpack('!14s', data) |
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82 | print("received this ", comm) |
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83 | |
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84 | ############################################################## |
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85 | |
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86 | |
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87 | |
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88 | n_rcvd += 1 |
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89 | if ok: |
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90 | n_right += 1 |
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91 | |
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92 | #print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( |
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93 | # ok, pktno, n_rcvd, n_right) |
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94 | #print "ok = %5s n_rcvd = %4d n_right = %4d" % ( |
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95 | # ok, n_rcvd, n_right) |
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96 | |
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97 | #print "sync_status is ",sync_status," @@\n" |
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98 | |
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99 | mods = modulation_utils.type_1_mods() |
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100 | #print "printing mods",mods,"$$$$\n" |
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101 | demods = modulation_utils.type_1_demods() |
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102 | |
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103 | #setting up the tx options parser |
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104 | parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve") |
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105 | expert_grp_tx = parser_tx.add_option_group("Expert_tx") |
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106 | #print "printing Expert_tx group",expert_grp_tx,"printing Expert_tx group" |
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107 | parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(), |
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108 | default='gmsk', |
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109 | help="Select modulation from: %s [default=%%default]" |
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110 | % (', '.join(mods.keys()),)) |
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111 | |
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112 | parser_tx.add_option("-s", "--size", type="eng_float", default=1500, |
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113 | help="set packet size [default=%default]") |
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114 | parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0, |
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115 | help="set megabytes to transmit [default=%default]") |
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116 | parser_tx.add_option("","--discontinuous", action="store_true", default=False, |
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117 | help="enable discontinous transmission (bursts of 5 packets)") |
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118 | parser_tx.add_option("","--from-file", default=None, |
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119 | help="use file for packet contents") |
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120 | print "printing parser_tx",parser_tx,"printing parser_tx" |
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121 | transmit_path.add_options(parser_tx, expert_grp_tx) |
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122 | |
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123 | for mod in mods.values(): |
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124 | mod.add_options(expert_grp_tx) |
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125 | |
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126 | (options_tx, args_tx) = parser_tx.parse_args () |
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127 | |
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128 | if len(args_tx) != 0: |
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129 | parser_tx.print_help() |
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130 | sys.exit(1) |
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131 | |
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132 | if options_tx.tx_freq is None: |
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133 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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134 | parser_tx.print_help(sys.stderr) |
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135 | sys.exit(1) |
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136 | |
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137 | if options_tx.from_file is not None: |
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138 | source_file = open(options_tx.from_file, 'r') |
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139 | print "printing modulation type",mods[options_tx.modulation],"**" |
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140 | # build the graph |
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141 | print "printing tx options",options_tx,"&&&&\n" |
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142 | #tb = my_top_block(mods[options_tx.modulation], options_tx) |
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143 | |
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144 | #r = gr.enable_realtime_scheduling() |
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145 | #if r != gr.RT_OK: |
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146 | # print "Warning: failed to enable realtime scheduling" |
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147 | |
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148 | #setting up rx options parser |
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149 | |
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150 | # Create Options Parser: |
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151 | parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve") |
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152 | print "printing parser_rx",parser_rx,"!!!!!\n" |
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153 | print "after option parser" |
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154 | expert_grp_rx = parser_rx.add_option_group("Expert_rx") |
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155 | print "printing expert group rx",expert_grp_rx,"@@@@\n" |
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156 | parser_rx.add_option("-m", "--modulation", type="choice", choices=demods.keys(), |
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157 | default='gmsk', |
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158 | help="Select modulation from: %s [default=%%default]" |
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159 | % (', '.join(demods.keys()),)) |
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160 | print "inside rx option parser" |
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161 | receive_path.add_options(parser_rx, expert_grp_rx) |
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162 | |
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163 | for mod in demods.values(): |
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164 | mod.add_options(expert_grp_rx) |
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165 | |
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166 | (options_rx, args_rx) = parser_rx.parse_args () |
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167 | |
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168 | if len(args_rx) != 0: |
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169 | parser_rx.print_help(sys.stderr) |
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170 | sys.exit(1) |
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171 | |
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172 | if options_rx.rx_freq is None: |
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173 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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174 | parser_rx.print_help(sys.stderr) |
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175 | sys.exit(1) |
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176 | print "printing rx options",options_rx,"&&&&\n" |
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177 | #options_rx.decim=128 #setting the decimation for receive path |
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178 | |
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179 | # build the graph |
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180 | |
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181 | tb = my_top_block(mods[options_tx.modulation], |
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182 | demods[options_rx.modulation], |
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183 | rx_callback,options_tx, |
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184 | options_rx) |
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185 | r = gr.enable_realtime_scheduling() |
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186 | if r != gr.RT_OK: |
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187 | print "Warning: failed to enable realtime scheduling" |
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188 | print "printing the decimation ",options_rx.decim,"\n" |
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189 | tb.start() |
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190 | #listening to random frequencies untill a match is found |
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191 | running = True |
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192 | global ch |
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193 | while running: |
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194 | ################################################sync mode#################################### |
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195 | if mode == "sync": |
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196 | |
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197 | if sync_status != True: |
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198 | #print "inside while" |
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199 | #ch = random.randint(1, 7) |
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200 | ch = int(random.choice('17')) |
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201 | #ch = random.randint(6, 12) |
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202 | #ch = 1 |
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203 | #hop_freq = float(1e6 * (400+(ch-1)*10))#setting the centre freq frequency for sending packets |
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204 | hop_freq = float(1e6 * (462.5625+(ch-1)*0.025)) |
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205 | #hop_freq = float(1e6 * (462.5625+(5-1)*0.05)) |
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206 | print "hop freq is",hop_freq,"@@@@\n" |
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207 | tb.txpath.set_freq(hop_freq) |
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208 | tb.rxpath.set_freq(hop_freq) |
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209 | time.sleep(0.05) |
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210 | #time.sleep(2) |
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211 | else: |
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212 | print "inside lese of while check" |
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213 | check_sync == 0 |
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214 | print "sync channel is found! and it is channel ",ch," \n" |
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215 | mode = "traffic" |
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216 | #tb.stop() |
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217 | #break |
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218 | #temp_variable = 2 |
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219 | #if temp_variable == 2: |
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220 | # print "success" |
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221 | |
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222 | |
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223 | |
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224 | ################################################end of sync mode#################################### |
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225 | |
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226 | ################################################Communications mode#################################### |
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227 | if mode == "traffic": |
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228 | print "Inside traffic mode" |
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229 | if check_sync == 0 |
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230 | time.sleep(0.4) |
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231 | if traffic_flag != True: |
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232 | mode = "sync" |
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233 | continue |
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234 | else: |
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235 | check_sync == 1 |
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236 | nbytes = 15 |
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237 | pkt_size = 15 |
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238 | sync_pktno = 0 |
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239 | while n < nbytes: |
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240 | #print >> myfile, "inside while" |
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241 | if options_tx.from_file is None: |
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242 | #data = (pkt_size - 2) * chr(data_pktno & 0xff) #0xff is 255 |
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243 | data = 'dI am fine.....' #Sending this message |
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244 | #print >> myfile, data |
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245 | #print "printing data",data,"****\n" |
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246 | else: |
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247 | data = source_file.read(pkt_size - 2) |
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248 | if data == '': |
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249 | break; |
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250 | |
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251 | |
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252 | payload = struct.pack('!15s', data) |
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253 | #print "printing payload",payload,"**\n" |
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254 | |
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255 | send_pkt(tb,payload) |
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256 | #print "printing payload",payload,"**\n" |
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257 | n += len(payload) |
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258 | sys.stderr.write('.') |
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259 | if options_tx.discontinuous and data_pktno % 5 == 4: |
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260 | time.sleep(1) |
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261 | data_pktno += 1 |
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262 | #print "before sleeping for 10 seconds and value of resend count is",resend_count |
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263 | #time.sleep(0.1) |
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264 | tb.rxpath.min_freq = hop_freq - 80e3 |
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265 | tb.rxpath.max_freq = hop_freq + 80e3 |
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266 | is_present = tb.rxpath.get_spec_stats(1e13,10) #check if primary user is present |
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267 | if is_present == True: #if primary user is present then get out of this communication channel, back to sync mode. |
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268 | mode = "sync" |
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269 | |
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270 | ################################################ end of Communications mode#################################### |
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271 | |
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272 | |
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273 | |
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274 | #var2 = 2 |
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275 | #if var2 ==2: |
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276 | # print "just checking this bug" |
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277 | |
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278 | |
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279 | # generate and send packets |
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280 | #print "printing megamytes",options_tx.megabytes," $$$$\n" |
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281 | #myfile = file("log.txt", 'w') |
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282 | #traceback.print_tb(traceback,None,myfile) |
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283 | |
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284 | #tb.wait() |
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285 | #tb.stop() |
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286 | |
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287 | if __name__ == '__main__': |
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288 | try: |
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289 | main() |
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290 | except KeyboardInterrupt: |
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291 | pass |
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