test/mm-poll-signal-strength

#!/usr/bin/python

# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import sys
import time

import mm

INTERFACES = ['interface_1_dbm', 'interface_2_dbm']

TIME = 60
SAMPLES = TIME * 2


manager, path = mm.PickOneModem('')
simple_modem = manager.SimpleModem(path)

strengths = []  # list of lists where list[i] is dbm for interface #i
start = time.time()
finish = start + TIME

for i in xrange(SAMPLES):
    next_reading_time = start + i *    (float(TIME) / float(SAMPLES))

    # Wait for next reading time
    while True:
        delta = next_reading_time - time.time()
        if delta > 0.01:
            time.sleep(delta)
        elif delta < -1:
            raise Exception('Fell too far behind: delta = %f' % delta)
        else:
            break

    sprops = simple_modem.GetStatus()

    sample = [int(sprops.get(interface, -256)) for
          interface in INTERFACES]
    strengths.append(sample)

    sample_string = ['%d' % x for x in sample]

    remaining = '%f remaining' % (finish - time.time())
    print >> sys.stderr, '\t'.join(['%.3f' % time.time()] +
                                   sample_string +
                                   [remaining])

means = []

for interface in xrange(len(INTERFACES)):
    means.append(sum([sample[interface] for sample in strengths]) /
                 float(len(strengths)))

output = ['%.1f' % x for x in [start] + means]
output_string = '\t'.join(output)

print >> sys.stderr, (
        time.strftime('%a, %d %b %Y %H:%M:%S local:  ', time.localtime()) +
        output_string)
print output_string