我正在使用带有 Raspbian Buster OS 的 Raspberry Pi 计算模块 3。我已连接 Quectel EC25 调制解调器并尝试使用网络管理器和调制解调器管理器工具连接到互联网。
每当我使用新的 Airtel 或 Vodafone SIM 卡时，都会Couldn't connect bearer: 'QMI protocol error (14): 'CallFailed'' 出现couldn't start network: QMI protocol error (79): 'PolicyMismatch'错误。随机数小时后（最多 50 小时），此错误得到解决，连接成功建立。我无法弄清楚到底是什么问题。
根据日志的错误列表：
Jan 4 15:43:52 24Seven-78 ModemManager[6574]: [/dev/cdc-wdm0] Registered 'wds' (version 1.67) client with ID '22'
Jan 4 15:43:52 24Seven-78 ModemManager[6574]: <info> error: couldn't start network: QMI protocol error (79): 'PolicyMismatch'
Jan 4 15:43:52 24Seven-78 ModemManager[6574]: [/dev/cdc-wdm0] Allocating new client ID...
Jan 4 15:43:52 24Seven-78 ModemManager[6574]: [/dev/cdc-wdm0] Registered 'wds' (version 1.67) client with ID '23'
Jan 4 15:43:52 24Seven-78 ModemManager[6574]: <info> error: couldn't start network: QMI protocol error (14): 'CallFailed'
Jan 4 15:43:52 24Seven-78 ModemManager[6574]: <info> call end reason (1): 'generic-unspecified'
Jan 4 15:43:52 24Seven-78 ModemManager[6574]: <info> verbose call end reason (2,237): [internal] (null)
Jan 4 16:46:54 24Seven-78 ModemManager[6574]: <info> Modem /org/freedesktop/ModemManager1/Modem/1: state changed (registered -> connecting)
Jan 4 16:46:54 24Seven-78 NetworkManager[535]: <info> [1609759014.9170] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 4 16:46:55 24Seven-78 ModemManager[6574]: <info> error: couldn't start network: QMI protocol error (14): 'CallFailed'
Jan 4 16:46:55 24Seven-78 ModemManager[6574]: <info> call end reason (1): 'generic-unspecified'
Jan 4 16:46:55 24Seven-78 ModemManager[6574]: <info> verbose call end reason (6,55): [3gpp] multiple-connection-to-same-pdn-not-allowed
Jan 4 16:46:55 24Seven-78 ModemManager[6574]: [/dev/cdc-wdm0] Allocating new client ID...
QMI 协议错误 2,237 表示ip-support-mismatch和 6,55 表示multiple-connection-to-same-pdn-not-allowed。我无法理解这些以及如何解决它们。
以下是网络管理器连接详细信息：
[connection]
id=MobileConnection
uuid=67bfdda8-e92d-4407-880d-eaf3294a5180
type=gsm
autoconnect-priority=3
interface-name=cdc-wdm0
permissions=
[gsm]
apn=www
number=*99#
[ipv4]
dns-search=
method=auto
route-metric=50
[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=auto
我正在附加调制解调器管理器的调试日志。