I seem to went the same path as described in "Connecting Raspberry Pi 3 with Huawei Surfstick 372". Bellow are the details of my case.
WHEN on wi-fi
The command ip addr show returns:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether b8:27:eb:04:34:b2 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether b8:27:eb:51:61:e7 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.108/24 brd 255.255.255.255 scope global noprefixroute wlan0
valid_lft forever preferred_lft forever
inet6 fe80::8ef:c3cc:ab76:6893/64 scope link
valid_lft forever preferred_lft forever
4: wwan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
link/ether 00:1e:10:1f:00:00 brd ff:ff:ff:ff:ff:ff
inet 169.254.62.145/16 brd 169.254.255.255 scope global noprefixroute wwan0
valid_lft forever preferred_lft forever
inet6 fe80::a2e6:a0b0:c3ed:c6f5/64 scope link
valid_lft forever preferred_lft forever
And the command ip route show returns:
default via 192.168.0.1 dev wlan0 proto dhcp src 192.168.0.108 metric 303 mtu 576
169.254.0.0/16 dev wwan0 scope link src 169.254.62.145 metric 204
192.168.0.0/24 dev wlan0 proto dhcp scope link src 192.168.0.108 metric 303 mtu 576
WHEN NOT on wi-fi
The command ip addr show returns:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether b8:27:eb:04:34:b2 brd ff:ff:ff:ff:ff:ff
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether b8:27:eb:51:61:e7 brd ff:ff:ff:ff:ff:ff
4: wwan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
link/ether 00:1e:10:1f:00:00 brd ff:ff:ff:ff:ff:ff
inet 169.254.62.145/16 brd 169.254.255.255 scope global noprefixroute wwan0
valid_lft forever preferred_lft forever
inet6 fe80::a2e6:a0b0:c3ed:c6f5/64 scope link
valid_lft forever preferred_lft forever
And the command ip route show returns:
default dev wwan0 scope link src 169.254.62.145 metric 204
169.254.0.0/16 dev wwan0 scope link src 169.254.62.145 metric 204
So it's according the abovementioned story not routed properly - there is no via. According to this post it is in the W10 operating in "HiLink mode" rather than the "Stick mode". I simply don't know what else to try with E3531 getting connected. Can anyone advise please? Thanks, Tomas, Pilsen, Czech
Note: I tried the surfstick in W10. Thanks to the retailer's program from O2 it actually got me connected (O2 just sells Huawei stick, but in this case it's not the internet service provider). The provider (the SIM card issuer) is SazkaMobil (a virtual operator).
As I'm reading imense amounts of posts I'm getting to a conclusion that connecting a USB stick is just not a good way. The more I dive into it the more unknowns emerge. Articles about it are outdated. My stick E3531 seems to have at least three modes:
12d1:15e7 = windows install mode virtual cdrom
12d1:15ca = usb storage (this is the default mode after start)
12d1:1506 = likely HiLink = Huawei's router with the 192.168.1 webpage. But that's not a modem according to some posts. And this is where it ends after the usb_modeswitch which supposedly switches from USB storage to the desired modem mode.
