Ubuntu移动宽带

Question

我在我的Jetson Nano to T-Mobile上用华为E220棒建立蜂窝连接时遇到了问题。它曾经能够连接，但现在不再连接。PIN被禁用，而stick在Windows下工作正常。我认为这可能与Ubuntu Modem Manager错误地将stick识别为E176有关？

请给我建议。

p:~$ lsusb | grep Huawei
Bus 001 Device 005: ID 12d1:1003 Huawei Technologies Co., Ltd. E220 HSDPA Modem / E230/E270/E870 HSDPA/HSUPA Modem
p:~$ mmcli -L
    /org/freedesktop/ModemManager1/Modem/0 [huawei] E176
p:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.3 LTS
Release:    18.04
Codename:   bionic
p:~$ nmcli d
DEVICE   TYPE      STATE                 CONNECTION         
eth0     ethernet  connected             Wired connection 1 
l4tbr0   bridge    connected             l4tbr0             
ttyUSB1  gsm       connecting (prepare)  T-Mo               
dummy0   dummy     unmanaged             --                 
rndis0   ethernet  unmanaged             --                 
usb0     ethernet  unmanaged             --                 
lo       loopback  unmanaged             -- 

Answer 1

在几次神秘的连接/断开后，我在Nano和调制解调器之间放了一根USB延长线，瞧！连接现在是健壮的。不管你在你的连接图标中看到多少行，如果激活失败，你可能会有接收问题，在你的日志中有这样的消息：

$ sudo journalctl -fu NetworkManager
-- Logs begin at Fri 2019-10-25 12:49:30 CEST. --
okt 25 12:53:54 jerry-desktop NetworkManager[3947]: <info>  [1572000834.4694] device (ttyUSB1): Activation: starting connection 'T-Mobile Default' (94e66a1c-baa3-4d94-b439-80ca55d26735)
okt 25 12:53:54 jerry-desktop NetworkManager[3947]: <info>  [1572000834.4705] device (ttyUSB1): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
okt 25 12:55:04 jerry-desktop NetworkManager[3947]: <info>  [1572000904.4144] connectivity: (l4tbr0) timed out
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <warn>  [1572000960.4562] modem-broadband[ttyUSB1]: failed to connect modem: Network timeout
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info>  [1572000960.4566] device (ttyUSB1): state change: prepare -> failed (reason 'gsm-registration-timeout', sys-iface-state: 'managed')
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <warn>  [1572000960.4600] device (ttyUSB1): Activation: failed for connection 'T-Mobile Default'
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info>  [1572000960.4627] device (ttyUSB1): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info>  [1572000960.4649] policy: auto-activating connection 'T-Mobile Default'
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info>  [1572000960.4679] device (ttyUSB1): Activation: starting connection 'T-Mobile Default' (94e66a1c-baa3-4d94-b439-80ca55d26735)
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info>  [1572000960.4690] device (ttyUSB1): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
okt 25 12:58:06 jerry-desktop NetworkManager[3947]: <warn>  [1572001086.4517] modem-broadband[ttyUSB1]: failed to connect modem: Network timeout