Problem with TP-Link Archer C7 - disconnected device

srdz · September 28, 2020, 12:50pm

Hi.
A few days ago, on my Archer C7, I uploaded the latest version of OpenWrt.
At home, I have 10 wall switches, 6 x sonoff th10 with a temperature sensor for underfloor heating and a few sonoff basic. All devices connect to the router on 2.4 GHz.
Everything worked fine on the original tplink software, but openwrt has a problem.
I noticed that the wall switch was blinking (disconnected from wifi) then lit again (connected to router). After a while, another wall switch, sonoff does the same.

logread from putty tells me that the devices are disconnecting and reconnecting after a while.

What could be the reason ? What information should I send for you that could help you find the problem?

for example:

Mon Sep 28 14:27:58 2020 authpriv.info dropbear[5908]: Child connection from 192.168.1.10:63572
Mon Sep 28 14:28:03 2020 authpriv.notice dropbear[5908]: Password auth succeeded for 'root' from 192.168.1.10:63572
Mon Sep 28 14:28:11 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Mon Sep 28 14:30:04 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Mon Sep 28 14:32:07 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Mon Sep 28 14:34:02 2020 daemon.notice hostapd: wlan1-1: AP-STA-DISCONNECTED dc:4f:22:f9:b5:49
Mon Sep 28 14:34:02 2020 daemon.info hostapd: wlan1-1: STA dc:4f:22:f9:b5:49 IEEE 802.11: authenticated
Mon Sep 28 14:34:02 2020 daemon.info hostapd: wlan1-1: STA dc:4f:22:f9:b5:49 IEEE 802.11: associated (aid 2)
Mon Sep 28 14:34:02 2020 daemon.notice hostapd: wlan1-1: AP-STA-CONNECTED dc:4f:22:f9:b5:49
Mon Sep 28 14:34:02 2020 daemon.info hostapd: wlan1-1: STA dc:4f:22:f9:b5:49 WPA: pairwise key handshake completed (RSN)
Mon Sep 28 14:34:02 2020 daemon.info dnsmasq-dhcp[2026]: DHCPDISCOVER(br-lan) dc:4f:22:f9:b5:49
Mon Sep 28 14:34:02 2020 daemon.info dnsmasq-dhcp[2026]: DHCPOFFER(br-lan) 192.168.1.141 dc:4f:22:f9:b5:49
Mon Sep 28 14:34:02 2020 daemon.info dnsmasq-dhcp[2026]: DHCPREQUEST(br-lan) 192.168.1.141 dc:4f:22:f9:b5:49
Mon Sep 28 14:34:02 2020 daemon.info dnsmasq-dhcp[2026]: DHCPACK(br-lan) 192.168.1.141 dc:4f:22:f9:b5:49 basic-zolwie

and my ps:

 PID USER       VSZ STAT COMMAND
    1 root      1568 S    /sbin/procd
    2 root         0 SW   [kthreadd]
    4 root         0 IW<  [kworker/0:0H]
    6 root         0 IW<  [mm_percpu_wq]
    7 root         0 SW   [ksoftirqd/0]
   95 root         0 SW   [oom_reaper]
   96 root         0 IW<  [writeback]
   98 root         0 SW   [kcompactd0]
   99 root         0 IW<  [crypto]
  101 root         0 IW<  [kblockd]
  116 root         0 IW<  [watchdogd]
  137 root         0 SW   [kswapd0]
  196 root         0 SW   [spi0]
  383 root         0 IW<  [ipv6_addrconf]
  392 root         0 IW<  [kworker/0:1H]
  402 root         0 SW   [irq/14-keys]
  403 root         0 SW   [irq/15-keys]
  509 root         0 SWN  [jffs2_gcd_mtd9]
  668 root      1244 S    /sbin/ubusd
  669 root       924 S    /sbin/askfirst /usr/libexec/login.sh
  686 root      1028 S    /sbin/urngd
  768 root         0 IW<  [cfg80211]
  781 root         0 IW<  [ath10k_wq]
  782 root         0 IW<  [ath10k_aux_wq]
 1116 root      1292 S    /sbin/logd -S 64
 1147 root      2240 S    /sbin/rpcd -s /var/run/ubus.sock -t 30
 1243 root      1080 S    /usr/sbin/dropbear -F -P /var/run/dropbear.1.pid -p 22 -K 300 -T 3
 1300 root      1748 S    /sbin/netifd
 1334 root      1448 S    /usr/sbin/odhcpd
 1397 root      1348 S    /usr/sbin/uhttpd -f -h /www -r srdz -x /cgi-bin -t 60 -T 30 -k 20 -A 1 -n 3 -N 100 -R -p 0.0.0.0:80 -p [::]:80
 1408 root       992 S    /usr/sbin/vsftpd
 1906 root      1216 S<   /usr/sbin/ntpd -n -N -S /usr/sbin/ntpd-hotplug -p 0.openwrt.pool.ntp.org -p 1.openwrt.pool.ntp.org -p 2.openwrt.pool.ntp.org -p 3.openwrt.po
 2026 dnsmasq   1372 S    /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
 2164 root         0 IW   [kworker/u2:1]
 3403 root         0 IW   [kworker/0:2]
 3483 root      1052 S    odhcp6c -s /lib/netifd/dhcpv6.script -P0 -t120 eth0.2
 4008 root      1212 S    udhcpc -p /var/run/udhcpc-br-wan.pid -s /lib/netifd/dhcp.script -f -t 0 -i br-wan -x hostname:srdz -C -O 121
 4317 root         0 IW   [kworker/0:3]
 4687 root      1780 S    /usr/sbin/hostapd -s -P /var/run/wifi-phy0.pid -B /var/run/hostapd-phy0.conf
 4720 root      1820 S    /usr/sbin/hostapd -s -P /var/run/wifi-phy1.pid -B /var/run/hostapd-phy1.conf
 5908 root      1148 S    /usr/sbin/dropbear -F -P /var/run/dropbear.1.pid -p 22 -K 300 -T 3
 5909 root      1220 S    -ash
 5921 root         0 IW   [kworker/u2:2]
 5948 root      1212 R    ps

uci export network:

package network

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fdca:13be:43e0::/48'

config interface 'lan'
        option type 'bridge'
        option ifname 'eth0.1'
        option proto 'static'
        option ipaddr '192.168.1.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        option ifname 'eth0.2'
        option proto 'dhcp'
        option type 'bridge'

config device 'wan_eth0_2_dev'
        option name 'eth0.2'
        option macaddr '98:da:c4:3f:05:a4'

config interface 'wan6'
        option ifname 'eth0.2'
        option proto 'dhcpv6'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'

config switch_vlan
        option device 'switch0'
        option vlan '1'
        option ports '2 3 4 5 0t'

config switch_vlan
        option device 'switch0'
        option vlan '2'
        option ports '1 0t'

uci export dhcp (all my devices has dhcp address):

package dhcp

config dnsmasq
        option domainneeded '1'
        option localise_queries '1'
        option rebind_protection '1'
        option rebind_localhost '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.auto'
        option localservice '1'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv6 'server'
        option ra 'server'

config dhcp 'wan'
        option interface 'wan'
        option ignore '1'

config odhcpd 'odhcpd'
        option maindhcp '0'
        option leasefile '/tmp/hosts/odhcpd'
        option leasetrigger '/usr/sbin/odhcpd-update'
        option loglevel '4'

config host
        option mac 'DC:4F:22:A6:64:7C'
        option dns '1'
        option ip '192.168.1.100'
        option name 'wall-salon-kuchnia'

config host
        option mac 'C4:4F:33:9A:E6:40'
        option name 'wall-kuchnia-led'
        option dns '1'
        option ip '192.168.1.101'

config host
        option mac 'C4:4F:33:9A:EE:AF'
        option name 'wall-kuchnia-halogeny'
        option dns '1'
        option ip '192.168.1.102'

config host
        option mac 'C4:4F:33:9A:F2:B4'
        option name 'wall-hol'
        option dns '1'
        option ip '192.168.1.103'

config host
        option mac 'DC:4F:22:AA:F0:E6'
        option name 'wall-schody-dol'
        option dns '1'
        option ip '192.168.1.104'

config host
        option mac 'DC:4F:22:AC:B3:4C'
        option name 'wall-schody-gora'
        option dns '1'
        option ip '192.168.1.105'

config host
        option mac 'C4:4F:33:9B:0E:4B'
        option name 'wall-wojtus'
        option dns '1'
        option ip '192.168.1.106'

config host
        option mac 'C4:4F:33:9B:0D:FD'
        option name 'wall-sypialnia'
        option dns '1'
        option ip '192.168.1.107'

config host
        option mac 'C4:4F:33:9A:EB:A5'
        option name 'wall-wc-gora'
        option dns '1'
        option ip '192.168.1.108'

config host
        option mac '74:C1:4F:AC:E0:0E'
        option name 'tel-p20lite'
        option dns '1'
        option ip '192.168.1.50'

config host
        option mac '3C:6A:A7:78:C4:D6'
        option name 'pc-sluzbowy-michal'
        option dns '1'
        option ip '192.168.1.11'
        option duid '0001000123859759f43909dde94e'

config host
        option mac 'C4:4F:33:9A:EF:7D'
        option name 'wall-taras'
        option dns '1'
        option ip '192.168.1.109'

config host
        option mac 'D8:CE:3A:F2:C6:7B'
        option name 'tel-redmi8pro'
        option dns '1'
        option ip '192.168.1.51'

config host
        option mac 'BC:DD:C2:EA:4E:E1'
        option name 'ogrzewanie-salon-kuchnia'
        option dns '1'
        option ip '192.168.1.120'

config host
        option mac 'DC:4F:22:43:98:96'
        option name 'ogrzewanie-lazienka-dol'
        option dns '1'
        option ip '192.168.1.121'

config host
        option mac 'DC:4F:22:43:9E:93'
        option name 'ogrzewanie-wojtus'
        option dns '1'
        option ip '192.168.1.122'

config host
        option mac 'DC:4F:22:43:D9:73'
        option name 'ogrzewanie-sypialnia'
        option dns '1'
        option ip '192.168.1.123'

config host
        option mac 'DC:4F:22:97:78:9F'
        option name 'basic-alarm-kamera-szafa'
        option dns '1'
        option ip '192.168.1.140'

config host
        option mac '5C:CF:7F:7F:66:0C'
        option name 'ogrzewanie-lazienka-gora'
        option dns '1'
        option ip '192.168.1.124'

config host
        option mac '34:23:87:F0:64:65'
        option dns '1'
        option name 'pc-lenovo'
        option duid '0001000125f2bda5201a0694b9ff'
        option ip '192.168.1.10'

config host
        option mac 'DC:4F:22:F9:B5:49'
        option name 'basic-zolwie'
        option dns '1'
        option ip '192.168.1.141'

config host
        option mac 'D4:25:8B:23:33:BD'
        option dns '1'
        option name 'pc-sluzbowy-karolina'
        option duid '0001000126c44c6980ce6221092e'
        option ip '192.168.1.12'

config host
        option mac 'B4:D5:BD:50:D3:95'
        option dns '1'
        option name 'pc-kiano'
        option duid '00041fabf2a61458bdcf93d818c915b836ad'
        option ip '192.168.1.13'

config host
        option mac '64:90:C1:00:23:B5'
        option name 'roborock'
        option dns '1'
        option ip '192.168.1.160'

config host
        option mac 'AC:CF:23:B3:D4:94'
        option name 'ferguson-hub'
        option dns '1'
        option ip '192.168.1.180'

config host
        option mac 'A0:9D:C1:9B:B9:5D'
        option name 'ferguson-free-bird'
        option dns '1'
        option ip '192.168.1.181'

uci export wireless:

package wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option channel '36'
        option hwmode '11a'
        option path 'pci0000:00/0000:00:00.0'
        option htmode 'VHT80'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option key 'xxxxxxxxxx'
        option ssid 'srdz_5ghz'
        option encryption 'psk2'

config wifi-device 'radio1'
        option type 'mac80211'
        option channel '11'
        option hwmode '11g'
        option path 'platform/ahb/18100000.wmac'
        option htmode 'HT20'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option key 'xxxxxxxxxx'
        option ssid 'srdz_2.4ghz'
        option encryption 'psk2'

config wifi-iface 'wifinet2'
        option ssid 'srdz_smart_home'
        option encryption 'psk2'
        option device 'radio1'
        option mode 'ap'
        option key 'xxxxxxxxxx'
        option network 'lan'

Thanks.

trendy · October 1, 2020, 12:56pm

From the logs it is not evident what was the reason for the disconnect, however it seems that is reconnected immediately (disconnect up to DHCPACK at 14:34:02)
I suppose you have ruled out the possibility of interference from other access points in the premises, right?
Is there any log from the sonoff switches?

srdz · October 1, 2020, 3:39pm

What do you mean by "I suppose you have ruled out the possibility of interference from other access points in the premises, right?"
is it a different access point in my home?
If so, there is no such option. Sonoff and the wall switch are hardwired to only one device.
I have just talked to a friend who knows sonoff and other devices, such as wall switches (with Supla Project software loaded). He told me that if the 5ghz wifi network was named the same as the 2.4ghz network, the devices would disconnect (he had heard of this type of conflict). For me, networks are called differently.
Could there be a problem in the network name, ie "_"? I would like to add that on the original software I had a space in the name of the network and everything worked fine.
Also, I wonder, after consulting with a colleague, could the problem be that both 5 ghz and 2.4 ghz have a wlan1 interface?
Can it be changed e.g. for 2.4 wlan0 and for 5 wlan1?
At the moment, I have turned off the 5 GHz network and I will see how the devices behave.
Thanks for your reply and thank you in advance for your help.

srdz · October 1, 2020, 3:43pm

Sonoff does not have the log option on non-original software. In all my problematic devices there is an alternative version of the software (Supla Project) installed and it has no logs.
Despite the uploaded Supla Project, there were no problems on the original tp-link software.

Ponadto właśnie zauważyłem, że pomimo wyłączenia sieci 5ghz nadal jest to samo

Thu Oct  1 17:21:17 2020 daemon.notice hostapd: wlan0: interface state ENABLED->DISABLED
Thu Oct  1 17:21:17 2020 daemon.notice hostapd: wlan0: AP-STA-DISCONNECTED d8:ce:3a:f2:c6:7b
Thu Oct  1 17:21:17 2020 daemon.notice hostapd: wlan0: AP-STA-DISCONNECTED b4:d5:bd:50:d3:95
Thu Oct  1 17:21:17 2020 daemon.notice hostapd: wlan0: AP-DISABLED
Thu Oct  1 17:21:17 2020 daemon.notice hostapd: wlan0: CTRL-EVENT-TERMINATING
Thu Oct  1 17:21:17 2020 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Thu Oct  1 17:21:17 2020 daemon.notice hostapd: nl80211: Failed to remove interface wlan0 from bridge br-lan: Invalid argument
Thu Oct  1 17:21:28 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:23:33 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:23:39 2020 authpriv.info dropbear[10255]: Child connection from 192.168.1.10:57765
Thu Oct  1 17:23:49 2020 authpriv.warn dropbear[10255]: Login attempt for nonexistent user from 192.168.1.10:57765
Thu Oct  1 17:24:15 2020 authpriv.info dropbear[10255]: Exit before auth: Exited normally
Thu Oct  1 17:24:20 2020 authpriv.info dropbear[10296]: Child connection from 192.168.1.10:57767
Thu Oct  1 17:24:25 2020 authpriv.notice dropbear[10296]: Password auth succeeded for 'root' from 192.168.1.10:57767
Thu Oct  1 17:25:41 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:27:33 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:29:46 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:32:00 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:32:44 2020 daemon.notice hostapd: wlan1-1: AP-STA-DISCONNECTED dc:4f:22:43:9e:93
Thu Oct  1 17:32:44 2020 daemon.info hostapd: wlan1-1: STA dc:4f:22:43:9e:93 IEEE 802.11: authenticated
Thu Oct  1 17:32:44 2020 daemon.info hostapd: wlan1-1: STA dc:4f:22:43:9e:93 IEEE 802.11: associated (aid 6)
Thu Oct  1 17:32:44 2020 daemon.notice hostapd: wlan1-1: AP-STA-CONNECTED dc:4f:22:43:9e:93
Thu Oct  1 17:32:44 2020 daemon.info hostapd: wlan1-1: STA dc:4f:22:43:9e:93 WPA: pairwise key handshake completed (RSN)
Thu Oct  1 17:32:44 2020 daemon.info dnsmasq-dhcp[2026]: DHCPDISCOVER(br-lan) dc:4f:22:43:9e:93
Thu Oct  1 17:32:44 2020 daemon.info dnsmasq-dhcp[2026]: DHCPOFFER(br-lan) 192.168.1.122 dc:4f:22:43:9e:93
Thu Oct  1 17:32:44 2020 daemon.info dnsmasq-dhcp[2026]: DHCPREQUEST(br-lan) 192.168.1.122 dc:4f:22:43:9e:93
Thu Oct  1 17:32:44 2020 daemon.info dnsmasq-dhcp[2026]: DHCPACK(br-lan) 192.168.1.122 dc:4f:22:43:9e:93 ogrzewanie-wojtus
Thu Oct  1 17:33:52 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:35:55 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:37:53 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:39:51 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)
Thu Oct  1 17:41:59 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)

srdz · October 1, 2020, 3:44pm

what is:

Thu Oct  1 17:25:41 2020 daemon.err odhcp6c[3483]: Failed to send DHCPV6 message to ff02::1:2 (Permission denied)

?

srdz · October 1, 2020, 4:06pm

Sorry to write back several times, but I would like to add that after a moment of reflection - the wall switches are on the original Ewelink software and only the sonoff basic and th10 are on Supla Project. They all disconnect from the router. In addition, I noticed that connected to the router on the 2.4 GHz network, the Xiaomi Roborock S5Max robotic vacuum cleaner does not disconnect (I did not meet it on logread). This makes you wonder if there is any conflict with the wall switch and sonoff chipset (all of these devices work on ESP8266).

trendy · October 2, 2020, 9:42am

I am asking if there are other access points from neighbors which operate in nearby channels and might cause interference. I suppose this access point is the only one you have, right?

Although I don't think it is the reason for your troubles, I tend to avoid using special characters in the SSID or key.

One radio will be wlan0 and the other wlan1.

This is not relevant.

I don't know about that. There might be some issue with the wireless driver used by OpenWrt, although I cannot pinpoint it.
If there is no other solution or workaround, you may want to roll back to stock firmware and use the router as access point only. Then add another router running OpenWrt if you want to take advantage of the added functionality.