Modemmanager V1.16.8 Quectel EC21 connection hangs

Ralf Glaser glaser at
Mon Aug 2 15:51:27 UTC 2021


we are experiencing problems when crossing the border from Germany to Austria (or more interesting here from Vodafone Germany to ATM). This is most likely the "out-of-call" error i mentioned before.
Unfortunately i can not provide a log at this time but we will investigate further.
Meaningful logging on an embedded device is a bit painful and we can reproduce this situation once a week at best, so is there anything i should pay special attention to (advanced logging options, checks i should perform when the error occurs, etc.)?
Is there reason to expect an improvement with V1.18?
One way to get out of this is (if i remember correctly):
systemctl restart modemmanager
systemctl restart networkmanager

Best regards,

Dipl. Ing. Ralf Glaser


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