Couldn't connect to Quectel EC25 Modem on Jetson Nano

I’m trying to connect to Quectel EC25 on Jetson Nano. My Jetson Nano detects the modem. When I command “sudo modem-manager.mmcli -L”, the output is " /org/freedesktop/ModemManager1/Modem/5 [Quectel] EC25". However, it doesn’t connect when I run these Python line: “sock.connect((35.217.55.111, 9696))”.
Can the problem be caused by the port or IP address? Because I’m not sure I must use those port and IP address. Thank you.

Sorry for the late response, is this still an issue to support?

Thanks

Hi, it’s still an issue - at least for me.

I can dialup to my provider using NetworkManager and get some data over the line before the ttyUSB2 gsm device somehow “collapses” after a minute or so, dropping the IP and thus the connectivity.
The device /dev/ttyUSB2 (along its siblings 0,1,3) remains in the filesystem, but network manager fails to connect to it or rather denies its existence: “Error: Connection activation failed: No suitable device found for this connection.”
Trying to connect to /dev/ttyUSB2 via picocom yields a “FATAL: cannot open /dev/ttyUSB2: Device or resource busy”, which at least fits into the picture

Something very similar is reported here:

It puts blame on the rather old kernel 4.9 but sadly omits the details.

Needless to say that the very same modem behaves just fine with the same settings on a Raspi.

@fubu227 @furkan.nargul

Could you attach the kernel log here?
There should be some usefull information. You can get with dmesg after the module.ko loaded.

Here we go.

It’s all fine and dandy until 11:46:03, The kernel modules are loaded, the device are set up, the connection is started, we get an IP and we are online.

May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6395] device (ttyUSB2): Activation: successful, device activated.

At 11:46:34, 31 seconds later, things go south:

May 24 11:46:34 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (connected -> registered)
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.2838] modem["ttyUSB2"]: modem state changed, 'connected' --> 'registered' (reason: user-requested)
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.2839] device (ttyUSB2): state change: activated -> failed (reason 'modem-no-carrier', sys-iface-state: 'managed')
May 24 11:46:34 mini NetworkManager[4063]: <warn>  [1621849594.2964] device (ttyUSB2): Activation: failed for connection 'Swisscom'

The interesting part is that NetworkManager claims this state change from connected to registered (which means from “from online to offline”) was user-requested. Probably ModemManager is considered the user here - unfortunately it doesn’t give a hint why it fails.
Then, after a few more seconds of trying to recover the device remains unavailable.

May 24 11:46:58 mini ModemManager[4121]: <warn>  (tty/ttyUSB2) at port timed out 6 consecutive times
May 24 11:46:58 mini ModemManager[4121]: <warn>  Couldn't initialize PDP context with our APN: 'Sending command failed: 'Resource temporarily unavailable''

What I’ve already tried is using the patched kernel modules as mentioned in the post on the sixfab community above. It did not change the behaviour at all.

Here’s the whole log, in case I’m missing the culprit:

May 24 11:45:39 mini kernel: [ 1020.297579] usb 1-2.3.4.1: new high-speed USB device number 10 using tegra-xusb
May 24 11:45:39 mini kernel: [ 1020.331097] usb 1-2.3.4.1: New USB device found, idVendor=2c7c, idProduct=0125
May 24 11:45:39 mini kernel: [ 1020.331152] usb 1-2.3.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
May 24 11:45:39 mini kernel: [ 1020.331191] usb 1-2.3.4.1: Product: EG25-G
May 24 11:45:39 mini kernel: [ 1020.331232] usb 1-2.3.4.1: Manufacturer: Quectel
May 24 11:45:39 mini kernel: [ 1020.338394] option 1-2.3.4.1:1.0: GSM modem (1-port) converter detected
May 24 11:45:39 mini kernel: [ 1020.338667] usb 1-2.3.4.1: GSM modem (1-port) converter now attached to ttyUSB0
May 24 11:45:39 mini kernel: [ 1020.338848] option 1-2.3.4.1:1.1: GSM modem (1-port) converter detected
May 24 11:45:39 mini kernel: [ 1020.339080] usb 1-2.3.4.1: GSM modem (1-port) converter now attached to ttyUSB1
May 24 11:45:39 mini kernel: [ 1020.339346] option 1-2.3.4.1:1.2: GSM modem (1-port) converter detected
May 24 11:45:39 mini kernel: [ 1020.339936] usb 1-2.3.4.1: GSM modem (1-port) converter now attached to ttyUSB2
May 24 11:45:39 mini kernel: [ 1020.340198] option 1-2.3.4.1:1.3: GSM modem (1-port) converter detected
May 24 11:45:39 mini kernel: [ 1020.340518] usb 1-2.3.4.1: GSM modem (1-port) converter now attached to ttyUSB3
May 24 11:45:39 mini mtp-probe: checking bus 1, device 10: "/sys/devices/70090000.xusb/usb1/1-2/1-2.3/1-2.3.4/1-2.3.4.1"
May 24 11:45:39 mini mtp-probe: bus: 1, device: 10 was not an MTP device
May 24 11:45:52 mini ModemManager[4121]: <warn>  (tty/ttyUSB0) failed to parse QCDM version info command result: -7
May 24 11:45:58 mini ModemManager[4121]: <info>  [device /sys/devices/70090000.xusb/usb1/1-2/1-2.3/1-2.3.4/1-2.3.4.1] creating modem with plugin 'Generic' and '4' ports
May 24 11:45:58 mini ModemManager[4121]: <warn>  Could not grab port (tty/ttyUSB1): 'Cannot add port 'tty/ttyUSB1', unhandled serial type'
May 24 11:45:58 mini ModemManager[4121]: <info>  Modem for device '/sys/devices/70090000.xusb/usb1/1-2/1-2.3/1-2.3.4/1-2.3.4.1' successfully created
May 24 11:45:58 mini ModemManager[4121]: <info>  Modem: state changed (unknown -> locked)
May 24 11:45:58 mini ModemManager[4121]: <warn>  couldn't load IMSI: 'Unknown error'
May 24 11:45:58 mini ModemManager[4121]: <warn>  couldn't load Operator identifier: 'Cannot load Operator ID without IMSI'
May 24 11:45:58 mini ModemManager[4121]: <warn>  couldn't load Operator name: 'Failed to parse CRSM query result '+CRSM: 105,130,""''
May 24 11:45:58 mini ModemManager[4121]: <warn>  couldn't load list of Own Numbers: 'Failed to parse NV MDN command result: -17'
May 24 11:45:58 mini NetworkManager[4063]: <warn>  [1621849558.7707] modem["ttyUSB2"]: cannot enable/disable modem: locked
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7732] manager: (ttyUSB2): new Broadband device (/org/freedesktop/NetworkManager/Devices/10)
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7738] device (ttyUSB2): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7743] device (ttyUSB2): modem state 'locked'
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7770] device (ttyUSB2): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'managed')
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7783] policy: auto-activating connection 'Swisscom'
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7809] device (ttyUSB2): Activation: starting connection 'Swisscom' (2fa8a3df-9a3a-4617-b8e7-014e18357d5c)
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7814] device (ttyUSB2): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7828] device (ttyUSB2): state change: prepare -> need-auth (reason 'none', sys-iface-state: 'managed')
May 24 11:45:58 mini NetworkManager[4063]: <info>  [1621849558.7883] device (ttyUSB2): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
May 24 11:46:02 mini ModemManager[4121]: <warn>  Parse error in step 3: SIM reference data not found.
May 24 11:46:02 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (locked -> initializing)
May 24 11:46:02 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (initializing -> disabled)
May 24 11:46:02 mini NetworkManager[4063]: <info>  [1621849562.7282] modem["ttyUSB2"]: modem state changed, 'locked' --> 'disabled' (reason: unknown)
May 24 11:46:02 mini NetworkManager[4063]: <info>  [1621849562.7284] modem["ttyUSB2"]: modem state changed, 'disabled' --> 'enabling' (reason: user preference)
May 24 11:46:02 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (disabled -> enabling)
May 24 11:46:02 mini ModemManager[4121]: <info>  Simple connect started...
May 24 11:46:02 mini ModemManager[4121]: <info>  Simple connect state (4/8): Wait to get fully enabled
May 24 11:46:03 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (enabling -> enabled)
May 24 11:46:03 mini ModemManager[4121]: <info>  Simple connect state (5/8): Register
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.3611] modem["ttyUSB2"]: modem state changed, 'enabling' --> 'enabled' (reason: user-requested)
May 24 11:46:03 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: 3GPP Registration state changed (unknown -> registering)
May 24 11:46:03 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: 3GPP Registration state changed (registering -> roaming)
May 24 11:46:03 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (enabled -> registered)
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.4643] modem["ttyUSB2"]: modem state changed, 'enabled' --> 'registered' (reason: unknown)
May 24 11:46:03 mini ModemManager[4121]: <info>  Simple connect state (6/8): Bearer
May 24 11:46:03 mini ModemManager[4121]: <info>  Simple connect state (7/8): Connect
May 24 11:46:03 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (registered -> connecting)
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.4883] modem["ttyUSB2"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
May 24 11:46:03 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (connecting -> connected)
May 24 11:46:03 mini ModemManager[4121]: <info>  Simple connect state (8/8): All done
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.5387] modem["ttyUSB2"]: modem state changed, 'connecting' --> 'connected' (reason: user-requested)
May 24 11:46:03 mini NetworkManager[4063]: <warn>  [1621849563.5466] device (ttyUSB2): ip-ifname: set ifname 'ttyUSB2', unknown ifindex
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.5470] device (ttyUSB2): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.5478] device (ttyUSB2): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
May 24 11:46:03 mini NetworkManager[4063]: <warn>  [1621849563.5481] device (ttyUSB2): interface ttyUSB2 not up for IP configuration
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.5481] modem["ttyUSB2"]: using modem-specified IP timeout: 20 seconds
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.5487] ppp-manager: starting PPP connection
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.5521] ppp-manager: pppd started with pid 7092
May 24 11:46:03 mini pppd[7092]: Plugin /usr/lib/pppd/2.4.7/nm-pppd-plugin.so loaded.
May 24 11:46:03 mini NetworkManager[4063]: Plugin /usr/lib/pppd/2.4.7/nm-pppd-plugin.so loaded.
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (plugin_init): initializing
May 24 11:46:03 mini pppd[7092]: pppd 2.4.7 started by root, uid 0
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (nm_phasechange): status 3 / phase 'serial connection'
May 24 11:46:03 mini pppd[7092]: Using interface ppp0
May 24 11:46:03 mini NetworkManager[4063]: Using interface ppp0
May 24 11:46:03 mini NetworkManager[4063]: Connect: ppp0 <--> /dev/ttyUSB2
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
May 24 11:46:03 mini pppd[7092]: Connect: ppp0 <--> /dev/ttyUSB2
May 24 11:46:03 mini systemd-udevd[7098]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (nm_phasechange): status 6 / phase 'authenticate'
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (get_credentials): passwd-hook, requesting credentials...
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.5794] manager: (ppp0): new Ppp device (/org/freedesktop/NetworkManager/Devices/11)
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (get_credentials): got credentials from NetworkManager
May 24 11:46:03 mini NetworkManager[4063]: CHAP authentication succeeded
May 24 11:46:03 mini NetworkManager[4063]: CHAP authentication succeeded
May 24 11:46:03 mini pppd[7092]: CHAP authentication succeeded
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (nm_phasechange): status 8 / phase 'network'
May 24 11:46:03 mini pppd[7092]: CHAP authentication succeeded
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6021] devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6022] device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
May 24 11:46:03 mini pppd[7092]: Could not determine remote IP address: defaulting to XX.XX.XX.XX
May 24 11:46:03 mini NetworkManager[4063]: Could not determine remote IP address: defaulting to XX.XX.XX.XX
May 24 11:46:03 mini pppd[7092]: local  IP address XX.XX.XX.XX
May 24 11:46:03 mini pppd[7092]: remote IP address XX.XX.XX.XX
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (nm_phasechange): status 9 / phase 'running'
May 24 11:46:03 mini NetworkManager[4063]: local  IP address XX.XX.XX.XX
May 24 11:46:03 mini NetworkManager[4063]: remote IP address XX.XX.XX.XX
May 24 11:46:03 mini NetworkManager[4063]: primary   DNS address XX.XX.XX.XX
May 24 11:46:03 mini NetworkManager[4063]: secondary DNS address XX.XX.XX.XX
May 24 11:46:03 mini pppd[7092]: primary   DNS address XX.XX.XX.XX
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (nm_ip_up): ip-up event
May 24 11:46:03 mini pppd[7092]: secondary DNS address XX.XX.XX.XX
May 24 11:46:03 mini pppd[7092]: nm-ppp-plugin: (nm_ip_up): sending IPv4 config to NetworkManager...
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6189] ppp-manager: (IPv4 Config Get) reply received.
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6249] device (ppp0): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: 'external')
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6274] device (ttyUSB2): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6305] device (ppp0): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'external')
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6320] device (ttyUSB2): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6331] device (ttyUSB2): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
May 24 11:46:03 mini NetworkManager[4063]: <info>  [1621849563.6395] device (ttyUSB2): Activation: successful, device activated.
May 24 11:46:03 mini dbus-daemon[3945]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.7' (uid=0 pid=4063 comm="/usr/sbin/NetworkManager --no-daemon ")
May 24 11:46:03 mini systemd[1]: Starting resolvconf-pull-resolved.service...
May 24 11:46:03 mini systemd[1]: Starting Network Manager Script Dispatcher Service...
May 24 11:46:03 mini dbus-daemon[3945]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
May 24 11:46:03 mini systemd[1]: Started Network Manager Script Dispatcher Service.
May 24 11:46:03 mini nm-dispatcher: req:1 'up' [ppp0]: new request (1 scripts)
May 24 11:46:03 mini nm-dispatcher: req:1 'up' [ppp0]: start running ordered scripts...
May 24 11:46:03 mini systemd[1]: Started resolvconf-pull-resolved.service.
May 24 11:46:03 mini systemd[1]: Reloading OpenBSD Secure Shell server.
May 24 11:46:03 mini sshd[7252]: Could not load host key: /etc/ssh/ssh_host_ed25519_key
May 24 11:46:03 mini systemd[1]: Reloaded OpenBSD Secure Shell server.
May 24 11:46:03 mini sshd[4768]: Could not load host key: /etc/ssh/ssh_host_ed25519_key
May 24 11:46:34 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (connected -> registered)
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.2838] modem["ttyUSB2"]: modem state changed, 'connected' --> 'registered' (reason: user-requested)
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.2839] device (ttyUSB2): state change: activated -> failed (reason 'modem-no-carrier', sys-iface-state: 'managed')
May 24 11:46:34 mini NetworkManager[4063]: <warn>  [1621849594.2964] device (ttyUSB2): Activation: failed for connection 'Swisscom'
May 24 11:46:34 mini dbus-daemon[3945]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.7' (uid=0 pid=4063 comm="/usr/sbin/NetworkManager --no-daemon ")
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.2993] device (ttyUSB2): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
May 24 11:46:34 mini systemd[1]: Starting Network Manager Script Dispatcher Service...
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.3055] device (ppp0): state change: disconnected -> unmanaged (reason 'connection-assumed', sys-iface-state: 'external')
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.3065] policy: auto-activating connection 'Swisscom'
May 24 11:46:34 mini systemd[1]: Starting resolvconf-pull-resolved.service...
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.3216] device (ttyUSB2): Activation: starting connection 'Swisscom' (2fa8a3df-9a3a-4617-b8e7-014e18357d5c)
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.3223] device (ttyUSB2): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
May 24 11:46:34 mini systemd[1]: Started resolvconf-pull-resolved.service.
May 24 11:46:34 mini systemd[1]: Started Network Manager Script Dispatcher Service.
May 24 11:46:34 mini dbus-daemon[3945]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
May 24 11:46:34 mini nm-dispatcher: req:1 'down' [ppp0]: new request (1 scripts)
May 24 11:46:34 mini nm-dispatcher: req:1 'down' [ppp0]: start running ordered scripts...
May 24 11:46:34 mini ModemManager[4121]: <info>  Simple connect started...
May 24 11:46:34 mini ModemManager[4121]: <info>  Simple connect state (4/8): Wait to get fully enabled
May 24 11:46:34 mini ModemManager[4121]: <info>  Simple connect state (5/8): Register
May 24 11:46:34 mini ModemManager[4121]: <info>  Simple connect state (6/8): Bearer
May 24 11:46:34 mini ModemManager[4121]: <info>  Simple connect state (7/8): Connect
May 24 11:46:34 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (registered -> connecting)
May 24 11:46:34 mini NetworkManager[4063]: <info>  [1621849594.3521] modem["ttyUSB2"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
May 24 11:46:34 mini pppd[7092]: IPV6CP: timeout sending Config-Requests
May 24 11:46:34 mini NetworkManager[4063]: IPV6CP: timeout sending Config-Requests
May 24 11:46:42 mini ModemManager[4121]: <warn>  (tty/ttyUSB2) at port timed out 2 consecutive times
May 24 11:46:42 mini ModemManager[4121]: <warn>  Couldn't initialize PDP context with our APN: 'Sending command failed: 'Resource temporarily unavailable''
May 24 11:46:42 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (connecting -> registered)
May 24 11:46:42 mini NetworkManager[4063]: <info>  [1621849602.2781] modem["ttyUSB2"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
May 24 11:46:42 mini ModemManager[4121]: <info>  Simple connect started...
May 24 11:46:42 mini ModemManager[4121]: <info>  Simple connect state (4/8): Wait to get fully enabled
May 24 11:46:42 mini ModemManager[4121]: <info>  Simple connect state (5/8): Register
May 24 11:46:42 mini ModemManager[4121]: <info>  Simple connect state (6/8): Bearer
May 24 11:46:42 mini ModemManager[4121]: <info>  Simple connect state (7/8): Connect
May 24 11:46:42 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (registered -> connecting)
May 24 11:46:42 mini NetworkManager[4063]: <info>  [1621849602.2966] modem["ttyUSB2"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
May 24 11:46:46 mini ModemManager[4121]: <warn>  (tty/ttyUSB2) at port timed out 3 consecutive times
May 24 11:46:50 mini ModemManager[4121]: <warn>  (tty/ttyUSB2) at port timed out 4 consecutive times
May 24 11:46:50 mini ModemManager[4121]: <warn>  Couldn't initialize PDP context with our APN: 'Sending command failed: 'Resource temporarily unavailable''
May 24 11:46:50 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (connecting -> registered)
May 24 11:46:50 mini NetworkManager[4063]: <info>  [1621849610.4102] modem["ttyUSB2"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
May 24 11:46:50 mini ModemManager[4121]: <info>  Simple connect started...
May 24 11:46:50 mini ModemManager[4121]: <info>  Simple connect state (4/8): Wait to get fully enabled
May 24 11:46:50 mini ModemManager[4121]: <info>  Simple connect state (5/8): Register
May 24 11:46:50 mini ModemManager[4121]: <info>  Simple connect state (6/8): Bearer
May 24 11:46:50 mini ModemManager[4121]: <info>  Simple connect state (7/8): Connect
May 24 11:46:50 mini ModemManager[4121]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (registered -> connecting)
May 24 11:46:50 mini NetworkManager[4063]: <info>  [1621849610.4303] modem["ttyUSB2"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
May 24 11:46:54 mini ModemManager[4121]: <warn>  (tty/ttyUSB2) at port timed out 5 consecutive times
May 24 11:46:58 mini ModemManager[4121]: <warn>  (tty/ttyUSB2) at port timed out 6 consecutive times
May 24 11:46:58 mini ModemManager[4121]: <warn>  Couldn't initialize PDP context with our APN: 'Sending command failed: 'Resource temporarily unavailable''