Hi,

we got a Quectel EC21 in a location with bad reception (4G (mostly) not 
available, using 2G as fallback, connection still unstable). The system works 
nicely for a while until we encounter the situation below from which it never 
recovers.

Jan 18 15:50:43 CloudGateway01 ModemManager[188]: transaction 0x71e aborted, 
but message is not abortable
Jan 18 15:50:43 CloudGateway01 ModemManager[188]: transaction 0xf aborted, but 
message is not abortable
Jan 18 15:50:43 CloudGateway01 ModemManager[188]: <warn>  [modem0/bearer0] 
checking if connected failed: Transaction timed out
Jan 18 15:50:43 CloudGateway01 ModemManager[188]: <warn>  [modem0] could not 
load SIM identifier: QMI operation failed: Transaction timed out
Jan 18 15:50:43 CloudGateway01 ModemManager[188]: <warn>  [modem0] (quectel) 
couldn't check SIM swap: QMI operation failed: Transaction timed out
Jan 18 15:50:48 CloudGateway01 ModemManager[188]: transaction 0x71f aborted, 
but message is not abortable
Jan 18 15:50:48 CloudGateway01 ModemManager[188]: <warn>  [modem0/bearer0] 
checking if connected failed: Transaction timed out
Jan 18 15:50:53 CloudGateway01 ModemManager[188]: transaction 0x720 aborted, 
but message is not abortable


Our current workaround is a reboot after which the system works again for some 
time.
Has anyone seen this before or could offer some advice (i'd like to find a more 
gracious method of recovery than a reboot)?

Best regards,
Ralf


Dipl. Ing. Ralf Glaser

Entwicklungsleiter


IoTmaxx GmbH

Bultstrasse 5a

30159 Hannover



Tel.: +49 511 936874-29

Fax.: +49 511 936874-33



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