<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-2022-jp"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="DE" link="blue" vlink="#954F72"> <div class="WordSection1"> Hi there, <o:p> </o:p> I am testing a device Management Framework named balenaOS on a couple of Edge devices. Networking is managed by ModemManager/NetworkManager. After a couple of hours my device (Raspberry CM3 based) goes offline, having no Internet Connection via LTE any more. When I connect to the device via LAN, I can see that the modem has disappeared: <o:p> </o:p> root@9d52738:~# mmcli -L No modems were found root@9d52738:~# nmcli d DEVICE TYPE STATE CONNECTION eth0 ethernet connected Wired connection 1 supervisor0 bridge connected supervisor0 balena0 bridge unmanaged -- br-4a4858757201 bridge unmanaged -- resin-dns bridge unmanaged -- veth607d783 ethernet unmanaged -- veth91c10ab ethernet unmanaged -- vethd462048 ethernet unmanaged -- vethe6faf8c ethernet unmanaged -- vethf0bd237 ethernet unmanaged -- lo loopback unmanaged -- resin-vpn tun unmanaged -- root@9d52738:~# nmcli c NAME UUID TYPE DEVICE Wired connection 1 b7cd7ae6-6bbe-3c64-b4a7-d687b5550671 ethernet eth0 supervisor0 a0dd8e69-49ab-4946-ba7a-b2036e96f530 bridge supervisor0 gsm d8f002d1-dfc3-3cad-ac58-c7d3cc563b75 gsm -- <o:p> </o:p> <o:p> </o:p> This is my NetworkManager config: root@9d52738:~# cat /etc/NetworkManager/system-connections/gsm.nmconnection [connection] id=gsm type=gsm autoconnect=true autoconnect-retries=0 <o:p> </o:p> [gsm] apn=web.vodafone.de <o:p> </o:p> [ppp] no-vj-comp=true nobsdcomp=true nodeflate=true <o:p> </o:p> [ipv4] method=auto <o:p> </o:p> [ipv6] method=ignore <o:p> </o:p> <o:p> </o:p> <o:p> </o:p> Interestingly, the modem’s devices are visible: root@9d52738:~# ls -l /dev/ttyUSB* crw-rw---- 1 root dialout 188, 0 Dec 3 11:30 /dev/ttyUSB0 crw-rw---- 1 root dialout 188, 1 Dec 6 10:39 /dev/ttyUSB1 crw-rw---- 1 root dialout 188, 2 Dec 6 10:39 /dev/ttyUSB2 crw-rw---- 1 root dialout 188, 3 Dec 6 21:42 /dev/ttyUSB3 crw-rw---- 1 root dialout 188, 4 Dec 6 10:39 /dev/ttyUSB4 crw-rw---- 1 root dialout 188, 5 Dec 6 10:39 /dev/ttyUSB5 <o:p> </o:p> <o:p> </o:p> <o:p> </o:p> These are the nm/mm versions I use: mmcli 1.10.6 nmcli tool, version 1.20.2 <o:p> </o:p> <o:p> </o:p> <o:p> </o:p> The Journal does only Show Events About 1h ago, the modem went offline earlier: root@9d52738:~# date Fri Dec 6 23:16:39 UTC 2019 <o:p> </o:p> root@9d52738:~# journalctl -u ModemManager -- Logs begin at Fri 2019-12-06 22:15:49 UTC, end at Fri 2019-12-06 23:16:40 UTC. -- -- No entries -- <o:p> </o:p> root@9d52738:~# journalctl -u NetworkManager -- Logs begin at Fri 2019-12-06 22:15:49 UTC, end at Fri 2019-12-06 23:17:14 UTC. -- Dec 06 22:35:09 9d52738 NetworkManager[805]: <info> [1575671709.1903] dhcp4 (eth0): state changed bound -> expire Dec 06 22:35:09 9d52738 NetworkManager[805]: <info> [1575671709.1906] device (eth0): DHCPv4: 480 seconds grace period started Dec 06 22:35:12 9d52738 NetworkManager[805]: <info> [1575671712.2717] dhcp4 (eth0): state changed expire -> bound Dec 06 22:36:26 9d52738 NetworkManager[805]: <info> [1575671786.1989] manager: (resin-vpn): new Tun device (/org/freedesktop/NetworkManager/Devices/655) <o:p> </o:p> <o:p> </o:p> <o:p> </o:p> I cannot see anything unusual in the Service Status: root@9d52738:~# systemctl status ModemManager.service ● ModemManager.service - Modem Manager Loaded: loaded (/lib/systemd/system/ModemManager.service; enabled; vendor preset: enabled) Active: active (running) since Fri 2019-12-06 10:38:55 UTC; 12h ago Main PID: 3180 (ModemManager) Tasks: 3 (limit: 2305) Memory: 1.8M CGroup: /system.slice/ModemManager.service └瘢雹─3180 /usr/sbin/ModemManager --log-journal <o:p> </o:p> Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable. <o:p> </o:p> <o:p> </o:p> <o:p> </o:p> I am able to recover the modem manually by restarting the Service and waiting a Minute: root@9d52738:~# systemctl restart ModemManager.service <o:p> </o:p> root@9d52738:~# mmcli -L /org/freedesktop/ModemManager1/Modem/0 [Huawei Technologies Co., Ltd.] ME909s-120 root@9d52738:~# nmcli c NAME UUID TYPE DEVICE Wired connection 1 b7cd7ae6-6bbe-3c64-b4a7-d687b5550671 ethernet eth0 gsm d8f002d1-dfc3-3cad-ac58-c7d3cc563b75 gsm ttyUSB1 supervisor0 a0dd8e69-49ab-4946-ba7a-b2036e96f530 bridge supervisor0 <o:p> </o:p> root@9d52738:~# nmcli d DEVICE TYPE STATE CONNECTION eth0 ethernet connected Wired connection 1 supervisor0 bridge connected supervisor0 ttyUSB1 gsm connected gsm ppp0 ppp disconnected -- balena0 bridge unmanaged -- br-4a4858757201 bridge unmanaged -- resin-dns bridge unmanaged -- veth607d783 ethernet unmanaged -- veth91c10ab ethernet unmanaged -- vethd462048 ethernet unmanaged -- vethe6faf8c ethernet unmanaged -- vethf0bd237 ethernet unmanaged -- lo loopback unmanaged -- resin-vpn tun unmanaged -- <o:p> </o:p> <o:p> </o:p> It is important that the modem Connection stays online without manual Intervention. Any help with the issue much appreciated.<o:p></o:p> <o:p> </o:p> Kind regards<o:p></o:p> Bruno<o:p></o:p> </div> </body> </html>