uqmi: wait for the control device too
The control device /dev/cdc-wdm0 is not available immediately on the D-Link DWR-921 Rev.C3, therefore the wwan interface fails to start at boot with a "The specified control device does not exist" error. This patch alters /lib/netifd/proto/qmi.sh to wait for network.wwan.delay earlier, before checking for the control device, instead of just before interacting with the modem. One still has to use network.wwan.proto='qmi', as the "wwan" proto performs that sort of check before any delay is possible, failing with a "No valid device was found" error. Signed-off-by: Thomas Equeter <tequeter@users.noreply.github.com>v19.07.3_mercusys_ac12_duma
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