WiFi Disconnect 문제

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mandooawr
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WiFi Disconnect 문제

Post by mandooawr »

무선 동글은 하드커널 발 WiFi Module 5A단종으로 WiFi Module 0을 사용하고 있습니다.

lsusb

Code: Select all

Bus 002 Device 002: ID 05e3:0620 Genesys Logic, Inc. USB3.1 Hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 192f:0116 Avago Technologies, Pte.
Bus 001 Device 004: ID 03f0:0124 HP, Inc
Bus 001 Device 003: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter
Bus 001 Device 002: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
OS는 Ubuntu 20.04를 쓰고 있습니다.
uname -a
Linux odroid2 4.9.236-106 #1 SMP PREEMPT Wed Dec 2 22:00:52 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux

며칠 켜서 상태를 보다 보니 와이파이가 끊어지고 다시 연결이 안되는 문제가 있네요..
원인을 잘 모르겠네요..
cat /var/log/syslog |grep "reason" 로그를 살펴보니 아래와 같이 나오는 데 원인을 잘 모르겠네요..
무선랜 사용을 하면서 365일 켜놓고 사용할 거라 무선 끊어져도 다시 연결만 되면 되는 데 재연결시 오류가 발생하는 것 같습니다.
어떻게 해야할까요?

Code: Select all

Jan  4 01:37:02 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 01:37:02 odroid2 NetworkManager[2437]: <warn>  [1609691822.9597] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 01:38:33 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan  4 01:38:33 odroid2 NetworkManager[2437]: <warn>  [1609691913.0621] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 02:55:36 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 02:55:36 odroid2 NetworkManager[2437]: <warn>  [1609696536.0221] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 04:40:18 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 04:40:18 odroid2 NetworkManager[2437]: <warn>  [1609702818.0082] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 05:30:03 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan  4 05:30:03 odroid2 NetworkManager[2437]: <warn>  [1609705803.0981] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 06:43:23 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 06:43:23 odroid2 NetworkManager[2437]: <warn>  [1609710203.7466] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 06:51:39 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan  4 06:51:39 odroid2 NetworkManager[2437]: <warn>  [1609710699.0293] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 07:04:20 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 07:04:20 odroid2 NetworkManager[2437]: <warn>  [1609711460.0461] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 07:25:15 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 07:25:15 odroid2 NetworkManager[2437]: <warn>  [1609712715.7594] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 07:25:52 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan  4 07:25:52 odroid2 NetworkManager[2437]: <warn>  [1609712752.0612] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 07:27:55 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 07:27:55 odroid2 NetworkManager[2437]: <warn>  [1609712875.0295] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 07:28:30 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan  4 07:28:30 odroid2 NetworkManager[2437]: <warn>  [1609712910.0213] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 07:30:31 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 07:30:31 odroid2 NetworkManager[2437]: <warn>  [1609713031.9617] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 08:15:08 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 08:15:08 odroid2 NetworkManager[2437]: <warn>  [1609715708.0189] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 08:15:57 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan  4 08:15:57 odroid2 NetworkManager[2437]: <warn>  [1609715757.0581] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 08:30:54 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 08:30:54 odroid2 NetworkManager[2437]: <warn>  [1609716654.0220] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 08:38:46 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 08:38:46 odroid2 NetworkManager[2437]: <warn>  [1609717126.7692] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 09:12:53 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 09:12:53 odroid2 NetworkManager[2437]: <warn>  [1609719173.0117] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 09:19:17 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan  4 09:19:17 odroid2 NetworkManager[2437]: <warn>  [1609719557.0382] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 10:02:47 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 10:02:47 odroid2 NetworkManager[2437]: <warn>  [1609722167.0422] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 11:08:24 odroid2 wpa_supplicant[2455]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 11:08:24 odroid2 NetworkManager[2437]: <warn>  [1609726104.0195] sup-iface[0x55b090a130,wlan0]: connection disconnected (reason -4)
Jan  4 11:58:39 odroid2 kernel: [    4.602939@2] cectx ff80023c.aocec: wakeup_reason:0x0
Jan  4 11:58:40 odroid2 NetworkManager[2439]: <info>  [1609729120.3747] device (eth0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Jan  4 11:58:40 odroid2 NetworkManager[2439]: <info>  [1609729120.4701] device (wlan0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Jan  4 11:58:40 odroid2 NetworkManager[2439]: <info>  [1609729120.9650] device (wlan0): state change: unavailable -> disconnected (reason 'supplicant-available', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.3793] device (wlan0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.3802] device (wlan0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.3807] device (wlan0): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.3854] device (wlan0): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.3865] device (wlan0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.5131] device (eth0): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.5180] device (eth0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.5194] device (eth0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.5210] device (eth0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.5616] device (eth0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.5667] device (eth0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:42 odroid2 NetworkManager[2439]: <info>  [1609729122.5672] device (eth0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:45 odroid2 NetworkManager[2439]: <info>  [1609729125.6792] device (wlan0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:45 odroid2 NetworkManager[2439]: <info>  [1609729125.6952] device (wlan0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:45 odroid2 NetworkManager[2439]: <info>  [1609729125.7113] device (wlan0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
Jan  4 11:58:45 odroid2 NetworkManager[2439]: <info>  [1609729125.7122] device (wlan0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
Jan  4 13:53:43 odroid2 wpa_supplicant[2458]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 13:53:43 odroid2 NetworkManager[2439]: <warn>  [1609736023.5316] sup-iface[0x555cead930,wlan0]: connection disconnected (reason -4)
Jan  4 14:06:49 odroid2 wpa_supplicant[2458]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 14:06:49 odroid2 NetworkManager[2439]: <warn>  [1609736809.5030] sup-iface[0x555cead930,wlan0]: connection disconnected (reason -4)
Jan  4 14:54:06 odroid2 wpa_supplicant[2458]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan  4 14:54:06 odroid2 NetworkManager[2439]: <warn>  [1609739646.5237] sup-iface[0x555cead930,wlan0]: connection disconnected (reason -4)
Jan  4 15:20:18 odroid2 wpa_supplicant[2458]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 15:20:18 odroid2 NetworkManager[2439]: <warn>  [1609741218.4511] sup-iface[0x555cead930,wlan0]: connection disconnected (reason -4)
Jan  4 15:22:57 odroid2 wpa_supplicant[2458]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 15:22:57 odroid2 NetworkManager[2439]: <warn>  [1609741377.4958] sup-iface[0x555cead930,wlan0]: connection disconnected (reason -4)
Jan  4 15:41:18 odroid2 wpa_supplicant[2458]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan  4 15:41:18 odroid2 NetworkManager[2439]: <warn>  [1609742478.5262] sup-iface[0x555cead930,wlan0]: connection disconnected (reason -4)
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Re: WiFi Disconnect 문제

Post by odroid »

로그만 봐서는 원인을 찾기가 어렵네요.

WiFi Powersave option을 'disable'로 변경해 보시길 바랍니다.
viewtopic.php?p=298474#p298474
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mandooawr
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Re: WiFi Disconnect 문제

Post by mandooawr »

감사합니다.

절전문제 였으면 좋겠네요..
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Re: WiFi Disconnect 문제

Post by odroid »

테스트 해보시고 결과 공유 부탁드립니다.
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mandooawr
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Re: WiFi Disconnect 문제

Post by mandooawr »

cat /var/log/syslog |grep "reason"
Jan 7 03:35:06 odroid2 wpa_supplicant[2464]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan 7 03:35:06 odroid2 NetworkManager[2444]: <warn> [1609958106.5536] sup-iface[0x55ced78130,wlan0]: connection disconnected (reason -4)
Jan 7 07:30:11 odroid2 wpa_supplicant[2464]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan 7 07:30:11 odroid2 NetworkManager[2444]: <warn> [1609972211.7739] sup-iface[0x55ced78130,wlan0]: connection disconnected (reason -4)
Jan 7 14:00:12 odroid2 wpa_supplicant[2464]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan 7 14:00:12 odroid2 NetworkManager[2444]: <warn> [1609995612.5314] sup-iface[0x55ced78130,wlan0]: connection disconnected (reason -4)
Jan 7 14:00:27 odroid2 NetworkManager[2444]: <info> [1609995627.6255] device (wlan0): state change: activated -> failed (reason 'ssid-not-found', sys-iface-state: 'managed')
Jan 7 14:00:27 odroid2 NetworkManager[2444]: <info> [1609995627.6455] device (wlan0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:46 odroid2 NetworkManager[2444]: <info> [1610005666.4550] device (wlan0): state change: disconnected -> unmanaged (reason 'removed', sys-iface-state: 'removed')
Jan 7 16:47:54 odroid2 NetworkManager[2444]: <info> [1610005674.5338] device (wlan0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Jan 7 16:47:54 odroid2 NetworkManager[2444]: <info> [1610005674.8644] device (wlan0): state change: unavailable -> disconnected (reason 'supplicant-available', sys-iface-state: 'managed')
Jan 7 16:47:58 odroid2 NetworkManager[2444]: <info> [1610005678.9827] device (wlan0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:58 odroid2 NetworkManager[2444]: <info> [1610005678.9858] device (wlan0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:58 odroid2 NetworkManager[2444]: <info> [1610005678.9874] device (wlan0): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:58 odroid2 NetworkManager[2444]: <info> [1610005678.9968] device (wlan0): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:58 odroid2 NetworkManager[2444]: <info> [1610005678.9985] device (wlan0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:59 odroid2 NetworkManager[2444]: <info> [1610005679.1705] device (wlan0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:59 odroid2 NetworkManager[2444]: <info> [1610005679.1777] device (wlan0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:59 odroid2 NetworkManager[2444]: <info> [1610005679.2189] device (wlan0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
Jan 7 16:47:59 odroid2 NetworkManager[2444]: <info> [1610005679.2194] device (wlan0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
Jan 7 16:52:00 odroid2 wpa_supplicant[2464]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:36:6c:c9:88:e0 reason=4 locally_generated=1
Jan 7 16:52:00 odroid2 NetworkManager[2444]: <warn> [1610005920.7741] sup-iface[0x55ced78220,wlan0]: connection disconnected (reason -4)
Jan 7 16:56:36 odroid2 wpa_supplicant[2464]: wlan0: CTRL-EVENT-DISCONNECTED bssid=72:5d:cc:49:61:c0 reason=4 locally_generated=1
Jan 7 16:56:36 odroid2 NetworkManager[2444]: <warn> [1610006196.5662] sup-iface[0x55ced78220,wlan0]: connection disconnected (reason -4)

무선 네트워크가 끊기는 현상이 또 생기네요..
이번엔 오드로이드를 재부팅안하고 USB 동글 WiFi Module 0 만 뺏다 끼우니 되네요..
왜 이럴까요?
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Re: WiFi Disconnect 문제

Post by odroid »

어느정도의 기간동안 연결이 지속되다가 끊겼는지 알 수 있을까요?

차주에 테스트환경을 만들어서 재현해 보도록 하겠습니다.
Ubuntu Mate Desktop 이미지를 사용하시나요? 아니면 Minimal 이미지를 사용하시나요?
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mandooawr
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Re: WiFi Disconnect 문제

Post by mandooawr »

글타래에 있는 1월 4일에 절전모드 설정하고 난 후입니다.
Ubuntu Mate Desktop 이미지 사용중입니다.
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Re: WiFi Disconnect 문제

Post by odroid »

구글링 검색을 좀 해보니 dhcpd 설정에 문제가 있을때 발생하는 것 같습니다.
동일한 이미지를 설치하고 시스템 업데이트 후에 WiFi Module 0를 연결하고 일주일정도 Youtube를 반복재생해 보겠습니다.
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Re: WiFi Disconnect 문제

Post by odroid »

지난주 금요일 저녁부터 테스트를 시작하였으며, 아직까지는 끊어짐 없이 무선랜으로 유튜브 재생이 되고 있습니다.
이번 주말까지 계속 테스트를 진행해보고, 결과 알려드리겠습니다.
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Re: WiFi Disconnect 문제

Post by mandooawr »

어제 또 연결이 끊겼네요.
어제 자리에 없어 다른 사람이 확인하고 재부팅 했다는 데.. 원인이 무엇일 까요?
로그가 안남아 있어 어제 어떤 오류가 생겼는 지 알수 없네요..
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Re: WiFi Disconnect 문제

Post by odroid »

저희 테스트 환경에서는 5일간 끊어짐 현상은 없었습니다.

그런데 네트웍이 끊겼더라도 자동으로 재접속이 잘된다면 큰 문제는 아닐것 같습니다.
무선 공유기나 라우터의 전원을 몇번 끄고 켜기를 반복하면 어떻게 되나요?
공유기가 꺼졌다 켜지면 WiFi 접속이 자동으로 이루어 지나요?
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Re: WiFi Disconnect 문제

Post by mandooawr »

nmtui 로 자동 연결 설정을 해둔 상태고 같은 AP에 물려있는 RPI들은 잘 동작하고 있어서 AP문제는 아닌 것 같구요..
Odroid N2+를 두 대 테스트 운영하고 있는 데, 오늘 다른 한대도 네트워크가 끊겨서 이번엔 WiFi Module 0을 뺏다 꼽으니 자동 연결되네요..
WiFi Module 0를 뽑다 꼽을 때 보니 따뜻+a 느낌이네요.. 따로 온도잴 수 없어서 아쉽네요..
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Re: WiFi Disconnect 문제

Post by odroid »

시스템 로그나 커널 메시지에 특별한 단서가 없다면 원인 파악이 어렵겠네요. 저희는 차주 초까지 계속 돌려보겠습니다.
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Re: WiFi Disconnect 문제

Post by odroid »

260시간을 좀 넘게 테스트하고 있으며, 유뷰브 재생도 정상으로 잘되고 있습니다.
커널 로그에는 칩셋 드라이버 관련 Warning 메시지가 지속적으로 보이고 있습니다만, 무선네트웍이 끊이졌던 흔적은 못찾겠습니다.
따라서 일반적인 상황에서는 끊어짐 현상은 나타나지 않고, 특정 상황에서만 나타나는 것으로 생각되네요.

네트웍이 끊겼다는 것을 검출할 수 있다면, 임시 대안으로 USB 허브칩을 리셋 해보는 것은 어떨까요?
데몬이나 크론탭으로 1분에 한번씩 검출하는 백그라운드에서 실행하는 구조로 구현이 가능할것 같습니다.
https://wiki.odroid.com/odroid-n2/troub ... /hub_reset
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