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WAN Status Monitor and Modem Power Cycler

Problem Statement

My cable modem occasionally looses connection to ISP. So, the plan is:

  • monitor the wan connectivity status;
  • if connection is lost - powercycle the modem.

Design

Modem status is represented as JSON and is saved into a file. Periodically:

  • get WAN connectivity status by pinging WAN gateway;
  • compare current status with the old one;
  • act on changes.

WAN Connection States

WAN connectivity state is one of (see ConnectivityState):

  • up - WAN gateway ping succeeds;
  • sick - WAN gateway ping fails for up to ConnectivityStatus.wan_timeout_down seconds, 9 by default;
  • down - WAN gateway ping fails for more than ConnectivityStatus.wan_timeout_down seconds.

If the state is down and WAN gateway ping succeeds, there is an immediate state transition to up, thus skipping sick.

WAN State Transition Callbacks

When WAN connectivity state changes, an appropriate on_wan_XXX callback is called.

on_wan_down will powercycle the modem.

Powercycling the modem

The plan is to power the modem using Shelly Plug. Use the API to control the plug.

Implementation

Linting

While in src:

alex@latitude7490:~/Projects/wan-monitor/src$ mypy *.py
Success: no issues found in 8 source files

Testing

While in src:

alex@latitude7490:~/Projects/wan-monitor/src$ python3 -m unittest *_test.py
...
----------------------------------------------------------------------
Ran 3 tests in 0.607s

OK

Runing

From command line:

alex@latitude7490:~/Projects/wan-monitor/src$ python3 monitor_modem.py
0915.133708.742 INFO monitoring wan_gw 73.93.94.1
0915.165045.308 INFO on_wan_sick: 2021-09-15 16:50:45.307255, 4:07:57.335309
0915.165048.460 INFO on_wan_upup: 2021-09-15 16:50:48.458745, 0:00:03.151490
0915.203056.721 INFO on_wan_sick: 2021-09-15 20:30:56.720621, 3:40:08.261876
0915.203059.854 INFO on_wan_upup: 2021-09-15 20:30:59.853079, 0:00:03.132458
0916.092051.158 INFO on_wan_sick: 2021-09-16 09:20:51.157001, 12:49:51.303922
0916.092054.283 INFO on_wan_upup: 2021-09-16 09:20:54.281880, 0:00:03.124879
0916.101057.222 INFO on_wan_sick: 2021-09-16 10:10:57.220087, 0:50:02.938207
0916.101100.388 INFO on_wan_upup: 2021-09-16 10:11:00.385276, 0:00:03.165189
0916.103713.134 INFO on_wan_sick: 2021-09-16 10:37:13.132174, 0:26:12.746898
0916.103716.263 INFO on_wan_upup: 2021-09-16 10:37:16.262169, 0:00:03.129995
0916.104807.565 INFO on_wan_sick: 2021-09-16 10:48:07.563828, 0:10:51.301659
0916.104810.704 INFO on_wan_upup: 2021-09-16 10:48:10.702869, 0:00:03.139041
0916.111435.465 INFO on_wan_sick: 2021-09-16 11:14:35.464516, 0:26:24.761647
0916.111438.609 INFO on_wan_upup: 2021-09-16 11:14:38.608475, 0:00:03.143959
0916.112244.853 INFO on_wan_sick: 2021-09-16 11:22:44.852089, 0:08:06.243614
0916.112247.980 INFO on_wan_upup: 2021-09-16 11:22:47.980116, 0:00:03.128027
0916.114316.323 INFO on_wan_sick: 2021-09-16 11:43:16.322291, 0:20:28.342175
0916.114319.474 INFO on_wan_upup: 2021-09-16 11:43:19.472985, 0:00:03.150694
0916.114322.694 INFO on_wan_sick: 2021-09-16 11:43:22.692764, 0:00:03.219779
0916.114325.914 INFO WAN still sick since 2021-09-16 11:43:22.692764
0916.114329.059 INFO on_wan_upup: 2021-09-16 11:43:29.057913, 0:00:06.365149
0916.114541.385 INFO on_wan_sick: 2021-09-16 11:45:41.384545, 0:02:12.326632
0916.114544.519 INFO on_wan_upup: 2021-09-16 11:45:44.518001, 0:00:03.133456
0916.114756.127 INFO on_wan_sick: 2021-09-16 11:47:56.116399, 0:02:11.598398
0916.114759.279 INFO on_wan_upup: 2021-09-16 11:47:59.278229, 0:00:03.161830
0916.114837.133 INFO on_wan_sick: 2021-09-16 11:48:37.132009, 0:00:37.853780
0916.114840.306 INFO on_wan_upup: 2021-09-16 11:48:40.305495, 0:00:03.173486
0916.115008.511 INFO on_wan_sick: 2021-09-16 11:50:08.509934, 0:01:28.204439
0916.115011.690 INFO on_wan_upup: 2021-09-16 11:50:11.689278, 0:00:03.179344
0916.115324.278 INFO on_wan_sick: 2021-09-16 11:53:24.275310, 0:03:12.586032
0916.115327.451 INFO on_wan_upup: 2021-09-16 11:53:27.449142, 0:00:03.173832
0916.115824.420 INFO on_wan_sick: 2021-09-16 11:58:24.418689, 0:04:56.969547
0916.115827.564 INFO on_wan_upup: 2021-09-16 11:58:27.563348, 0:00:03.144659
0916.115915.000 INFO on_wan_sick: 2021-09-16 11:59:14.999337, 0:00:47.435989
0916.115918.148 INFO on_wan_upup: 2021-09-16 11:59:18.147547, 0:00:03.148210
0916.120056.085 INFO on_wan_sick: 2021-09-16 12:00:56.084662, 0:01:37.937115
0916.120059.237 INFO on_wan_upup: 2021-09-16 12:00:59.235697, 0:00:03.151035
0916.121250.335 INFO on_wan_sick: 2021-09-16 12:12:50.334193, 0:11:51.098496
0916.121253.473 INFO on_wan_upup: 2021-09-16 12:12:53.473478, 0:00:03.139285
0916.121325.111 INFO on_wan_sick: 2021-09-16 12:13:25.110992, 0:00:31.637514
0916.121328.332 INFO WAN still sick since 2021-09-16 12:13:25.110992
0916.121331.468 INFO on_wan_upup: 2021-09-16 12:13:31.467580, 0:00:06.356588
0916.121720.952 INFO on_wan_sick: 2021-09-16 12:17:20.951367, 0:03:49.483787
0916.121724.093 INFO on_wan_upup: 2021-09-16 12:17:24.091850, 0:00:03.140483
0916.130037.145 INFO on_wan_sick: 2021-09-16 13:00:37.144522, 0:43:13.052672
0916.130040.359 INFO on_wan_upup: 2021-09-16 13:00:40.358024, 0:00:03.213502
0916.132606.474 INFO on_wan_sick: 2021-09-16 13:26:06.472818, 0:25:26.114794
0916.132609.610 INFO on_wan_upup: 2021-09-16 13:26:09.609190, 0:00:03.136372
0916.134634.286 INFO on_wan_sick: 2021-09-16 13:46:34.284868, 0:20:24.675678
0916.134637.420 INFO on_wan_upup: 2021-09-16 13:46:37.419148, 0:00:03.134280
0916.135638.761 INFO on_wan_sick: 2021-09-16 13:56:38.761343, 0:10:01.342195
0916.135641.897 INFO on_wan_upup: 2021-09-16 13:56:41.896020, 0:00:03.134677
0916.135645.117 INFO on_wan_sick: 2021-09-16 13:56:45.116330, 0:00:03.220310
0916.135648.250 INFO on_wan_upup: 2021-09-16 13:56:48.249397, 0:00:03.133067
0916.140444.276 INFO on_wan_sick: 2021-09-16 14:04:44.275005, 0:07:56.025608
0916.140447.468 INFO on_wan_upup: 2021-09-16 14:04:47.466797, 0:00:03.191792
0916.140450.677 INFO on_wan_sick: 2021-09-16 14:04:50.677572, 0:00:03.210775
0916.140453.811 INFO on_wan_upup: 2021-09-16 14:04:53.810933, 0:00:03.133361
0916.141044.568 INFO on_wan_sick: 2021-09-16 14:10:44.566922, 0:05:50.755989
0916.141047.757 INFO on_wan_upup: 2021-09-16 14:10:47.755655, 0:00:03.188733
0916.141809.452 INFO on_wan_sick: 2021-09-16 14:18:09.451527, 0:07:21.695872
0916.141812.584 INFO on_wan_upup: 2021-09-16 14:18:12.582738, 0:00:03.131211
0916.141818.936 INFO on_wan_sick: 2021-09-16 14:18:18.934849, 0:00:06.352111
0916.141822.064 INFO on_wan_upup: 2021-09-16 14:18:22.063224, 0:00:03.128375
0916.142549.995 INFO on_wan_sick: 2021-09-16 14:25:49.994120, 0:07:27.930896
0916.142553.133 INFO on_wan_upup: 2021-09-16 14:25:53.132204, 0:00:03.138084
0916.143128.310 INFO on_wan_sick: 2021-09-16 14:31:28.308885, 0:05:35.176681
0916.143131.531 INFO WAN still sick since 2021-09-16 14:31:28.308885
0916.143134.751 INFO WAN still sick since 2021-09-16 14:31:28.308885
0916.143137.975 WARNING on_wan_down: 2021-09-16 14:31:37.974260, 0:00:09.665375
0916.143820.597 INFO on_wan_upup: 2021-09-16 14:38:20.594026, 0:06:42.619766
0916.143852.073 INFO on_wan_sick: 2021-09-16 14:38:52.072711, 0:00:31.478685
0916.143855.100 INFO WAN still sick since 2021-09-16 14:38:52.072711
0916.143858.130 INFO WAN still sick since 2021-09-16 14:38:52.072711
0916.143901.155 WARNING on_wan_down: 2021-09-16 14:39:01.154017, 0:00:09.081306
0916.144108.017 INFO on_wan_upup: 2021-09-16 14:41:08.017043, 0:02:06.863026

Status

This is a work in progress. Monitoring part is pretty much done. Powercycling - not started.