no wwan with qmi based modem quectel ec20
Username: Alexander Couzens
Origin: https://bugs.openwrt.org/index.php?do=details&task_id=587
uqmi hangs on certain commands resulting in a half-connected wwan connection.
device: apu1d
modem: quectel ec20 / qualcom based
affected versions: lede 17.01, trunk
good uqmi version: 2016-08-23-eb1dec7d0dc283a7f61aa574a443a0ab61f8793f
bad uqmi version: 2016-12-19-8ceeab69-1
1553 root 3288 S {qmi.sh} /bin/sh ./qmi.sh qmi setup lte {"ifname":"wwan0","proto":"qmi","apn":"internet"," 1620 root 9024 S uqmi -s -d /dev/cdc-wdm0 --wda-set-data-format 802.3 1817 root 3072 S grep qmi
config interface 'lte' option ifname 'wwan0' option proto 'qmi' option apn 'internet' option device '/dev/cdc-wdm0' option dhcp '1'