Observed with the latest snapshot:
when LTE modem is configured through luci-proto-qmi, the following line is not added to the configuration:
option pdptype 'ipv4v6'
Since the QMI connection script (/lib/netifd/proto/qmi.sh) is looking for pdptype, IPv6 connection could not be established.
I can add this option. Do you know which possible values there are for this option?
Name Type Required Default Description
pdptype string no IP Used IP-stack mode, IP (for IPv4), IPV6 (for IPv6) or IPV4V6 (for dual-stack)
https://openwrt.org/docs/guide-user/network/wan/wwan/ltedongle
yes, please