WWAN-connections using 3g with HUAWEI ME909u-521 unstable
Username: Reiner Otto
Origin: https://bugs.openwrt.org/index.php?do=details&task_id=115
Actually, I am trying to stabilize wwan (3g actually; LTE later on) using pppd with my HUAWEI ME909u-521,
because either my MT7620-based router locks up during boot already; or after short period of real usage.
During night, when router is almost idle, just some watchdog date sent via wwan, no problem.
First trace of a possible problem was this msg in logread:
daemon.notice netifd: wwan (1676): Error setting WWAN mode!
Wich is expected, as in /lib/netifd/proto/3g.sh:
...
elif echo "$cardinfo" | grep -qi huawei; then case "$service" in umts_only) CODE="14,2";; gprs_only) CODE="13,1";; *) CODE="2,2";; esac export MODE="AT^SYSCFG=${CODE},3FFFFFFF,2,4" #####Will not work !!!!! Switching USB-Stick to 3g-preferred ?
...
...
[ -n "$MODE" ] && gcom -d "$device" -s /etc/gcom/setmode.gcom
Will not work, because the ME909u-521 rejects AT^SYSCFG . However, AT^SYSCFGEX will work, but having different syntax.
MODE=”AT^SYSCFG=${CODE},3FFFFFFF,2,4” will be effective for simpler modems.
/etc/gcom/setmode.gcom returns exit 1; but this error is not checked in 3g.sh
Not shure, whether this is the reason for my problems; however, reason of concern, as high speed modems
are more and more common.
Willing to participate in testing/debugging.
For details regarding my modem, consult
HUAWEI ME909u-521 LTE LGA Module AT Command Interface Specification