I have a ZTE MF192 4G USB modem connected to Sagem F@st 2804 v7 router (OpenWrt 18.06).
It is connected using usb-modeswitch package.
It is working fine, but after a couple of hours, it suddenly stops working until I reconnect it (unplug and plug again).
The interface is configured as follows:
config interface '4G'
option proto '3g'
option device '/dev/ttyACM0'
option service 'umts'
option apn 'internet'
option username 'gdata'
option password 'gdata'
option dialnumber '*99#'
option ipv6 'auto'
Log
[ 0.000000] Linux version 4.9.120 (buildbot@builds-03.infra.lede-project.org) (gcc version 7.3.0 (OpenWrt GCC 7.3.0 r7102-3f3a2c9) ) #0 Wed Aug 15 20:42:39 2018
[ 0.000000] Detected Broadcom 0x6328 CPU revision b0
[ 0.000000] CPU frequency is 320 MHz
[ 0.000000] 64MB of RAM installed
[ 0.000000] board_bcm963xx: Boot address 0xb8000000
[ 0.000000] board_bcm963xx: CFE version: 54.46.52-49.0
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 0002a075 (Broadcom BMIPS4350)
[ 0.000000] board: board name: F@ST2704V2
[ 0.000000] MIPS: machine is Sagem F@ST2704V2
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 04000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 16 bytes.
[ 0.000000] Primary data cache 32kB, 2-way, VIPT, cache aliases, linesize 16 bytes
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] On node 0 totalpages: 16384
[ 0.000000] free_area_init_node: node 0, pgdat 80432a64, node_mem_map 810056f0
[ 0.000000] Normal zone: 128 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 16384 pages, LIFO batch:3
[ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: rootfstype=squashfs,jffs2 noinitrd console=ttyS0,115200
[ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Memory: 59104K/65536K available (3484K kernel code, 180K rwdata, 576K rodata, 1256K init, 217K bss, 6432K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=16, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:256
[ 0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 11945377789 ns
[ 0.000021] sched_clock: 32 bits at 160MHz, resolution 6ns, wraps every 13421772796ns
[ 0.008115] Calibrating delay loop... 319.74 BogoMIPS (lpj=639488)
[ 0.046792] pid_max: default: 32768 minimum: 301
[ 0.051833] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.058637] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.076306] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.086388] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.092831] pinctrl core: initialized pinctrl subsystem
[ 0.101509] NET: Registered protocol family 16
[ 0.110963] Can't analyze schedule() prologue at 80373764
[ 0.347243] registering PCI controller with io_map_base unset
[ 0.390079] PCI host bridge to bus 0000:00
[ 0.394325] pci_bus 0000:00: root bus resource [mem 0x10f00000-0x10ffffff]
[ 0.401392] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[ 0.408376] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[ 0.415366] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 0.423592] pci 0000:00:00.0: [14e4:6328] type 01 class 0x060400
[ 0.423725] pci 0000:00:00.0: PME# supported from D0 D3hot
[ 0.424193] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[ 0.432808] pci 0000:01:00.0: [14e4:a8db] type 00 class 0x028000
[ 0.432886] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00007fff 64bit]
[ 0.433133] pci 0000:01:00.0: supports D1 D2
[ 0.433547] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[ 0.433588] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 01
[ 0.433659] pci 0000:00:00.0: BAR 8: assigned [mem 0x10f00000-0x10ffffff]
[ 0.440685] pci 0000:01:00.0: BAR 0: assigned [mem 0x10f00000-0x10f07fff 64bit]
[ 0.448221] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 0.453319] pci 0000:00:00.0: bridge window [mem 0x10f00000-0x10ffffff]
[ 0.468496] clocksource: Switched to clocksource MIPS
[ 0.476677] NET: Registered protocol family 2
[ 0.483266] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.490557] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.497158] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.504187] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.510302] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.517316] NET: Registered protocol family 1
[ 0.521952] PCI: CLS 0 bytes, default 16
[ 0.531165] Crashlog allocated RAM at address 0x3f00000
[ 0.539822] workingset: timestamp_bits=30 max_order=14 bucket_order=0
[ 0.563232] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.569273] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.609955] io scheduler noop registered
[ 0.614016] io scheduler deadline registered (default)
[ 0.621222] bcm6328-pinctrl 10000080.pin-controller: registered at mmio b0000080
[ 0.630360] PCI: Enabling device 0000:00:00.0 (0000 -> 0002)
[ 0.637184] 10000100.serial: ttyS0 at MMIO 0x10000100 (irq = 36, base_baud = 1562500) is a bcm63xx_uart
[ 0.646933] console [ttyS0] enabled
[ 0.654086] bootconsole [early0] disabled
[ 0.683061] random: fast init done
[ 0.691782] m25p80 spi1.0: s25fl064k (8192 Kbytes)
[ 0.697457] bcm63xxpart: Partition 0 is CFE offset 0 and length 10000
[ 0.704116] bcm63xxpart: Partition 1 is nvram offset 7f0000 and length 10000
[ 0.711356] bcm63xxpart: Partition 2 is linux offset 10000 and length 7e0000
[ 0.718682] 3 bcm63xxpart partitions found on MTD device spi1.0
[ 0.724787] Creating 3 MTD partitions on "spi1.0":
[ 0.729711] 0x000000000000-0x000000010000 : "CFE"
[ 0.738038] 0x0000007f0000-0x000000800000 : "nvram"
[ 0.747330] 0x000000010000-0x0000007f0000 : "linux"
[ 0.758016] parser_imagetag: rootfs: CFE image tag found at 0x0 with version 6, board type F@ST2704V2
[ 0.767564] parser_imagetag: Partition 0 is kernel offset 100 and length 15b398
[ 0.775073] parser_imagetag: Partition 1 is rootfs offset 15b498 and length 684b68
[ 0.782862] parser_imagetag: Spare partition is offset 3c0004 and length 41fffc
[ 0.790480] 2 bcm963xx-imagetag partitions found on MTD device linux
[ 0.797039] Creating 2 MTD partitions on "linux":
[ 0.801876] 0x000000000100-0x00000015b498 : "kernel"
[ 0.810437] 0x00000015b498-0x0000007e0000 : "rootfs"
[ 0.819804] mtd: device 4 (rootfs) set to be root filesystem
[ 0.826813] 1 squashfs-split partitions found on MTD device rootfs
[ 0.833223] 0x0000003c0000-0x0000007e0000 : "rootfs_data"
[ 0.844098] libphy: Fixed MDIO Bus: probed
[ 0.893889] b53_common: found switch: BCM63xx, rev 0
[ 0.899571] bcm63xx-wdt bcm63xx-wdt: started, timer margin: 30 sec
[ 0.909080] PCI: Enabling device 0000:01:00.0 (0000 -> 0002)
[ 0.914971] bcma: bus0: Found chip with id 43227, rev 0x01 and package 0x09
[ 0.922190] bcma: bus0: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x27, class 0x0)
[ 0.931014] bcma: bus0: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x1E, class 0x0)
[ 0.939944] bcma: bus0: Core 2 found: PCIe (manuf 0x4BF, id 0x820, rev 0x14, class 0x0)
[ 0.948325] bcma: bus0: Using fallback SPROM failed (err -2)
[ 0.954140] bcma: bus0: No SPROM available
[ 0.973978] bcma: bus0: Bus registered
[ 0.979767] NET: Registered protocol family 10
[ 0.990985] NET: Registered protocol family 17
[ 0.995709] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 1.009064] 8021q: 802.1Q VLAN Support v1.8
[ 1.026437] VFS: Mounted root (squashfs filesystem) readonly on device 31:4.
[ 1.050927] Freeing unused kernel memory: 1256K
[ 1.055607] This architecture does not have kernel memory protection.
[ 2.131519] init: Console is alive
[ 2.135410] init: - watchdog -
[ 3.681616] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 3.871530] usbcore: registered new interface driver usbfs
[ 3.877439] usbcore: registered new interface driver hub
[ 3.883141] usbcore: registered new device driver usb
[ 3.903525] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 3.913352] ehci-platform: EHCI generic platform driver
[ 4.024570] ehci-platform ehci-platform: EHCI Host Controller
[ 4.030569] ehci-platform ehci-platform: new USB bus registered, assigned bus number 1
[ 4.039112] ehci-platform ehci-platform: irq 50, io mem 0xb0002500
[ 4.060538] ehci-platform ehci-platform: USB 2.0 started, EHCI 1.00, overcurrent ignored
[ 4.070868] hub 1-0:1.0: USB hub found
[ 4.075522] hub 1-0:1.0: 1 port detected
[ 4.086983] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 4.096293] ohci-platform: OHCI generic platform driver
[ 4.101963] ohci-platform ohci-platform: Generic Platform OHCI controller
[ 4.109037] ohci-platform ohci-platform: new USB bus registered, assigned bus number 2
[ 4.117356] ohci-platform ohci-platform: irq 49, io mem 0xb0002600
[ 4.186674] hub 2-0:1.0: USB hub found
[ 4.191277] hub 2-0:1.0: 1 port detected
[ 4.197254] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 4.216301] init: - preinit -
[ 4.630544] usb 1-1: new high-speed USB device number 2 using ehci-platform
[ 5.098757] hub 1-1:1.0: USB hub found
[ 5.110539] hub 1-1:1.0: 4 ports detected
[ 5.441074] random: procd: uninitialized urandom read (4 bytes read)
[ 5.520629] usb 1-1.2: new high-speed USB device number 3 using ehci-platform
[ 6.124186] random: jshn: uninitialized urandom read (4 bytes read)
[ 6.358545] random: jshn: uninitialized urandom read (4 bytes read)
[ 6.619545] random: jshn: uninitialized urandom read (4 bytes read)
[ 6.717001] random: jshn: uninitialized urandom read (4 bytes read)
[ 6.863458] random: jshn: uninitialized urandom read (4 bytes read)
[ 7.439258] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 7.445891] IPv6: ADDRCONF(NETDEV_UP): eth0.1: link is not ready
[ 7.452632] IPv6: ADDRCONF(NETDEV_CHANGE): eth0.1: link becomes ready
[ 8.452957] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 11.145931] jffs2: notice: (374) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[ 11.169366] mount_root: switching to jffs2 overlay
[ 11.225267] urandom-seed: Seeding with /etc/urandom.seed
[ 11.482755] procd: - early -
[ 11.485931] procd: - watchdog -
[ 12.398866] procd: - watchdog -
[ 12.403528] procd: - ubus -
[ 12.624128] random: jshn: uninitialized urandom read (4 bytes read)
[ 12.672652] random: crng init done
[ 12.991004] procd: - init -
[ 16.591509] usb 1-1.2: USB disconnect, device number 3
[ 16.879189] kmodloader: loading kernel modules from /etc/modules.d/*
[ 16.945899] tun: Universal TUN/TAP device driver, 1.6
[ 16.951155] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
[ 16.992101] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 17.122962] uhci_hcd: USB Universal Host Controller Interface driver
[ 17.224398] usbcore: registered new interface driver cdc_acm
[ 17.230285] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[ 17.303966] usbcore: registered new interface driver cdc_wdm
[ 17.339026] Loading modules backported from Linux version wt-2017-11-01-0-gfe248fc2c180
[ 17.347333] Backport generated by backports.git v4.14-rc2-1-31-g86cf0e5d
[ 17.424930] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 17.502287] nf_conntrack version 0.5.0 (1024 buckets, 4096 max)
[ 17.854113] usbcore: registered new interface driver usbserial
[ 17.860383] usbcore: registered new interface driver usbserial_generic
[ 17.867357] usbserial: USB Serial support registered for generic
[ 18.006590] xt_time: kernel timezone is -0000
[ 18.506968] PPP generic driver version 2.4.2
[ 18.519201] NET: Registered protocol family 24
[ 18.534744] usbcore: registered new interface driver qmi_wwan
[ 18.597395] b43-phy0: Broadcom 43227 WLAN found (core revision 30)
[ 18.605094] b43-phy0: Found PHY: Analog 9, Type 4 (N), Revision 17
[ 18.611504] b43-phy0: Found Radio: Manuf 0x17F, ID 0x2057, Revision 14, Version 0
[ 18.620170] Broadcom 43xx driver loaded [ Features: PNL ]
[ 18.761021] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 18.934671] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[ 26.072734] usb 1-1.2: new high-speed USB device number 4 using ehci-platform
[ 26.206356] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[ 26.251201] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[ 26.303301] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[ 26.355210] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[ 45.951375] br-WAN: port 1(eth0.2) entered blocking state
[ 45.957016] br-WAN: port 1(eth0.2) entered disabled state
[ 45.963349] device eth0.2 entered promiscuous mode
[ 45.968311] device eth0 entered promiscuous mode
[ 46.049343] br-WAN: port 1(eth0.2) entered blocking state
[ 46.054921] br-WAN: port 1(eth0.2) entered forwarding state
[ 46.061003] IPv6: ADDRCONF(NETDEV_UP): br-WAN: link is not ready
[ 46.586653] br-lan: port 1(eth0.1) entered blocking state
[ 46.592244] br-lan: port 1(eth0.1) entered disabled state
[ 46.598615] device eth0.1 entered promiscuous mode
[ 46.728683] br-lan: port 1(eth0.1) entered blocking state
[ 46.734254] br-lan: port 1(eth0.1) entered forwarding state
[ 46.949318] IPv6: ADDRCONF(NETDEV_CHANGE): br-WAN: link becomes ready
[ 55.903000] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
[ 55.962694] b43-phy0 ERROR: No 2GHz EPA gain table available for this device
[ 55.981137] b43-phy0 ERROR: No 2GHz EPA gain table available for this device
[ 56.238189] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 56.252727] 3g-4G: renamed from ppp0
[ 56.308877] br-lan: port 2(wlan0) entered blocking state
[ 56.314393] br-lan: port 2(wlan0) entered disabled state
[ 56.320691] device wlan0 entered promiscuous mode
[ 57.269147] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 57.276025] br-lan: port 2(wlan0) entered blocking state
[ 57.281520] br-lan: port 2(wlan0) entered forwarding state
[ 83.812797] bcm63xx_enetsw bcm63xx_enetsw.0: link UP on Port 1, 100Mbps, full-duplex
[ 84.836690] bcm63xx_enetsw bcm63xx_enetsw.0: link DOWN on Port 1
[ 87.908811] bcm63xx_enetsw bcm63xx_enetsw.0: link UP on Port 1, 100Mbps, full-duplex
[ 5623.503058] usb 1-1.2: USB disconnect, device number 4
[ 5623.512949] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[ 5627.060352] usb 1-1.2: new high-speed USB device number 5 using ehci-platform
[ 5627.856196] usb 1-1.2: USB disconnect, device number 5
[ 5637.036389] usb 1-1.2: new high-speed USB device number 6 using ehci-platform
[ 5637.184427] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[ 5637.225471] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[ 5637.261439] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[ 5637.297520] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[ 5653.037922] 3g-4G: renamed from ppp0
[ 6507.471185] usb 1-1.2: USB disconnect, device number 6
[ 6507.481097] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[ 6510.767739] usb 1-1.2: new high-speed USB device number 7 using ehci-platform
[ 6512.079311] usb 1-1.2: USB disconnect, device number 7
[ 6521.263710] usb 1-1.2: new high-speed USB device number 8 using ehci-platform
[ 6521.405464] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[ 6521.440798] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[ 6521.476739] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[ 6521.524768] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[ 6537.439607] 3g-4G: renamed from ppp0
[ 6934.223182] usb 1-1.2: USB disconnect, device number 8
[ 6934.233293] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[ 6937.772479] usb 1-1.2: new high-speed USB device number 9 using ehci-platform
[ 6938.831333] usb 1-1.2: USB disconnect, device number 9
[ 6948.012432] usb 1-1.2: new high-speed USB device number 10 using ehci-platform
[ 6948.148137] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[ 6948.169578] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[ 6948.197626] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[ 6948.219712] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[ 6963.825570] 3g-4G: renamed from ppp0
[ 7685.583313] usb 1-1.2: USB disconnect, device number 10
[ 7685.593502] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[ 7689.135058] usb 1-1.2: new high-speed USB device number 11 using ehci-platform
[ 7690.447319] usb 1-1.2: USB disconnect, device number 11
[ 7699.631033] usb 1-1.2: new high-speed USB device number 12 using ehci-platform
[ 7699.783837] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[ 7699.828158] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[ 7699.888143] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[ 7699.952675] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[ 7715.212927] 3g-4G: renamed from ppp0
[ 7763.663183] usb 1-1.2: USB disconnect, device number 12
[ 7763.677588] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[ 7767.214574] usb 1-1.2: new high-speed USB device number 13 using ehci-platform
[ 7768.527185] usb 1-1.2: USB disconnect, device number 13
[ 7777.710454] usb 1-1.2: new high-speed USB device number 14 using ehci-platform
[ 7777.855107] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[ 7777.895640] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[ 7777.943593] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[ 7777.989414] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[ 7793.248050] 3g-4G: renamed from ppp0
[12494.543488] usb 1-1.2: USB disconnect, device number 14
[12494.562034] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[12498.097556] usb 1-1.2: new high-speed USB device number 15 using ehci-platform
[12499.151325] usb 1-1.2: USB disconnect, device number 15
[12508.333320] usb 1-1.2: new high-speed USB device number 16 using ehci-platform
[12508.460715] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[12508.486566] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[12508.510523] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[12508.531905] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[12524.161225] 3g-4G: renamed from ppp0
[12710.863319] usb 1-1.2: USB disconnect, device number 16
[12710.883612] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[12714.415508] usb 1-1.2: new high-speed USB device number 17 using ehci-platform
[12715.727331] usb 1-1.2: USB disconnect, device number 17
[12724.911427] usb 1-1.2: new high-speed USB device number 18 using ehci-platform
[12725.077934] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[12725.106725] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[12725.139771] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[12725.176600] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[12740.375422] 3g-4G: renamed from ppp0
[15964.367185] usb 1-1.2: USB disconnect, device number 18
[15964.377337] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[15967.918055] usb 1-1.2: new high-speed USB device number 19 using ehci-platform
[15969.231188] usb 1-1.2: USB disconnect, device number 19
[15978.414082] usb 1-1.2: new high-speed USB device number 20 using ehci-platform
[15978.549779] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[15978.595053] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[15978.635556] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[15978.685656] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[15994.157384] 3g-4G: renamed from ppp0
[16493.263183] usb 1-1.2: USB disconnect, device number 20
[16493.273357] cdc_acm 1-1.2:1.1: failed to set dtr/rts
[16496.813948] usb 1-1.2: new high-speed USB device number 21 using ehci-platform
[16497.872737] usb 1-1.2: USB disconnect, device number 21
[16507.053923] usb 1-1.2: new high-speed USB device number 22 using ehci-platform
[16507.197960] cdc_acm 1-1.2:1.1: ttyACM0: USB ACM device
[16507.239008] cdc_acm 1-1.2:1.3: ttyACM1: USB ACM device
[16507.283051] cdc_acm 1-1.2:1.5: ttyACM2: USB ACM device
[16507.331111] cdc_acm 1-1.2:1.7: ttyACM3: USB ACM device
[16522.721876] 3g-4G: renamed from ppp0
[17159.241985] 3g-4G: renamed from ppp0
[17315.551623] 3g-4G: renamed from ppp0
[17471.851779] 3g-4G: renamed from ppp0
[17628.137614] 3g-4G: renamed from ppp0
[17784.764809] 3g-4G: renamed from ppp0
[17940.963515] 3g-4G: renamed from ppp0
[18097.197959] 3g-4G: renamed from ppp0
[18253.453409] 3g-4G: renamed from ppp0
[18409.686621] 3g-4G: renamed from ppp0
[18566.078301] 3g-4G: renamed from ppp0
[18722.203673] 3g-4G: renamed from ppp0
[18878.715507] 3g-4G: renamed from ppp0
[19035.067037] 3g-4G: renamed from ppp0
[19191.286221] 3g-4G: renamed from ppp0
[19347.707948] 3g-4G: renamed from ppp0
[19503.943677] 3g-4G: renamed from ppp0
[19660.532105] 3g-4G: renamed from ppp0
[19816.798062] 3g-4G: renamed from ppp0
[19973.011728] 3g-4G: renamed from ppp0
[20129.721620] 3g-4G: renamed from ppp0
[20286.164512] 3g-4G: renamed from ppp0
[20442.867562] 3g-4G: renamed from ppp0
[20599.282005] 3g-4G: renamed from ppp0
[20755.892367] 3g-4G: renamed from ppp0
[20912.095917] 3g-4G: renamed from ppp0
[21068.229155] 3g-4G: renamed from ppp0
[21224.342865] 3g-4G: renamed from ppp0
[21380.463289] 3g-4G: renamed from ppp0
[21536.729431] 3g-4G: renamed from ppp0
[21692.998303] 3g-4G: renamed from ppp0
[21849.277238] 3g-4G: renamed from ppp0
[22005.391719] 3g-4G: renamed from ppp0
[22161.531844] 3g-4G: renamed from ppp0
[22317.695640] 3g-4G: renamed from ppp0
[22474.126161] 3g-4G: renamed from ppp0
[22630.249654] 3g-4G: renamed from ppp0
[22786.378920] 3g-4G: renamed from ppp0
[22942.793137] 3g-4G: renamed from ppp0
[23099.112922] 3g-4G: renamed from ppp0
[23255.239560] 3g-4G: renamed from ppp0
[23411.872368] 3g-4G: renamed from ppp0
[23568.072694] 3g-4G: renamed from ppp0
[23724.199394] 3g-4G: renamed from ppp0
[23880.388769] 3g-4G: renamed from ppp0
[24036.540035] 3g-4G: renamed from ppp0
[24192.716414] 3g-4G: renamed from ppp0
[24348.865912] 3g-4G: renamed from ppp0
[24505.083920] 3g-4G: renamed from ppp0
[24661.531128] 3g-4G: renamed from ppp0
[24817.785646] 3g-4G: renamed from ppp0
[24974.167814] 3g-4G: renamed from ppp0
[25130.510454] 3g-4G: renamed from ppp0
[25286.738917] 3g-4G: renamed from ppp0
[25443.177760] 3g-4G: renamed from ppp0
[25599.847479] 3g-4G: renamed from ppp0
[25756.286452] 3g-4G: renamed from ppp0
[25913.057558] 3g-4G: renamed from ppp0
[26069.170112] 3g-4G: renamed from ppp0
[26225.696588] 3g-4G: renamed from ppp0
[26382.019025] 3g-4G: renamed from ppp0
[26538.145093] 3g-4G: renamed from ppp0
[26694.462227] 3g-4G: renamed from ppp0
[26850.641206] 3g-4G: renamed from ppp0
[27006.829759] 3g-4G: renamed from ppp0
[27163.237449] 3g-4G: renamed from ppp0
[27319.629828] 3g-4G: renamed from ppp0
[27475.827295] 3g-4G: renamed from ppp0
Any advice will be much appreciated.