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#!/usr/bin/env python
'''
show times when signal is lost
'''
import sys, time, os
# allow import from the parent directory, where mavlink.py is
sys.path.insert(0, os.path.join(os.path.dirname(os.path.realpath(__file__)), '..'))
from optparse import OptionParser
parser = OptionParser("sigloss.py [options]")
parser.add_option("--no-timestamps",dest="notimestamps", action='store_true', help="Log doesn't have timestamps")
parser.add_option("--planner",dest="planner", action='store_true', help="use planner file format")
parser.add_option("--robust",dest="robust", action='store_true', help="Enable robust parsing (skip over bad data)")
parser.add_option("--mav10", action='store_true', default=False, help="Use MAVLink protocol 1.0")
parser.add_option("--deltat", type='float', default=1.0, help="loss threshold in seconds")
(opts, args) = parser.parse_args()
if opts.mav10:
os.environ['MAVLINK10'] = '1'
import mavutil
if len(args) < 1:
print("Usage: sigloss.py [options] <LOGFILE...>")
sys.exit(1)
def sigloss(logfile):
'''work out signal loss times for a log file'''
print("Processing log %s" % filename)
mlog = mavutil.mavlink_connection(filename,
planner_format=opts.planner,
notimestamps=opts.notimestamps,
robust_parsing=opts.robust)
last_t = 0
while True:
m = mlog.recv_match()
if m is None:
return
if opts.notimestamps:
if not 'usec' in m._fieldnames:
continue
t = m.usec / 1.0e6
else:
t = m._timestamp
if last_t != 0:
if t - last_t > opts.deltat:
print("Sig lost for %.1fs at %s" % (t-last_t, time.asctime(time.localtime(t))))
last_t = t
total = 0.0
for filename in args:
sigloss(filename)
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