src/measure_call_setup_time.py

   1 #!/usr/bin/env python3
   2 #
   3 # measure_call_setup_time - measure time between dialing out and ringing in
   4 #
   5 # Copyright (C) 2015  Antonio Ospite <ao2@ao2.it>
   6 #
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 from savemysugar.cumulative_average import cumulative_average
  21 from savemysugar.Modem import Modem
  22 import time
  23
  24
  25 class Ring(object):
  26     time = -1
  27
  28
  29 def on_ring():
  30     if Ring.time == -1:
  31         print("First ring")
  32         Ring.time = time.time()
  33         raise StopIteration("We just want the first ring")
  34
  35
  36 def measure_call_setup_time(ingoing_port, outgoing_port, destination_number):
  37     ingoing_modem = Modem(ingoing_port)
  38     ingoing_modem.register_callback("RING", on_ring)
  39
  40     outgoing_modem = Modem(outgoing_port)
  41
  42     min_call_time = 10000
  43     max_call_time = -1
  44     min_call_setup_time = 10000
  45     max_call_setup_time = -1
  46
  47     avg_call_setup_time = 0
  48
  49     for i in range(5):
  50         print()
  51         print("Attempt: %s" % (i + 1))
  52         outgoing_modem.send_command("ATDT" + destination_number)
  53         dial_time = time.time()
  54
  55         # Wait for the receiver to get a ring before terminating the call
  56         try:
  57             ingoing_modem.get_response_loop()
  58         except (StopIteration, KeyboardInterrupt):
  59             outgoing_modem.send_command("ATH")
  60             outgoing_modem.get_response()
  61
  62         hangup_time = time.time()
  63
  64         # When dialing with an analog modem I noticed that if calls are
  65         # separated one from another they take less time to set up, this
  66         # may be due to how an analog modem works: getting it on-hook and
  67         # off-hook takes quite some time.
  68         inter_call_sleep = 5.2
  69         print("After hangup sleeping %.2f sec..." % inter_call_sleep)
  70         time.sleep(inter_call_sleep)
  71
  72         call_setup_time = Ring.time - dial_time
  73         min_call_setup_time = min(min_call_setup_time, call_setup_time)
  74         max_call_setup_time = max(max_call_setup_time, call_setup_time)
  75         avg_call_setup_time = cumulative_average(avg_call_setup_time,
  76                                                  i + 1,
  77                                                  call_setup_time)
  78         uncertainty = (max_call_setup_time - min_call_setup_time) / 2.
  79         print("Call setup time: %f" % call_setup_time)
  80         print("Min call setup time: %f" % min_call_setup_time)
  81         print("Max call setup time: %f" % max_call_setup_time)
  82         print("Average call setup time: %f" % avg_call_setup_time)
  83         print("Call setup time uncertainty: %f" % uncertainty)
  84         print()
  85
  86         call_time = hangup_time - dial_time
  87         min_call_time = min(min_call_time, call_time)
  88         max_call_time = max(max_call_time, call_time)
  89         print("Total call time: %f" % call_time)
  90         print("Min call time: %f" % min_call_time)
  91         print("Max call time: %f" % max_call_time)
  92         print()
  93         Ring.time = -1
  94
  95
  96 def main():
  97     import sys
  98     if len(sys.argv) != 4:
  99         print("usage: %s" % sys.argv[0],
 100               "<ingoing serial port> <outgoing serial port>",
 101               "<destination number>")
 102         sys.exit(1)
 103
 104     measure_call_setup_time(sys.argv[1], sys.argv[2], sys.argv[3])
 105
 106
 107 if __name__ == "__main__":
 108     main()