<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <pre class="_32Z_DGGLfLn4LS0wYR2g9a allowTextSelection">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 </pre> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Our current workaround is a reboot after which the system works again for some time. </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Has anyone seen this before or could offer some advice (i'd like to find a more gracious method of recovery than a reboot)?</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Best regards,</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Ralf </div> <div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> </div> <div id="Signature"> <div> <div></div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <div> Dipl. Ing. Ralf Glaser </div> <div> Entwicklungsleiter </div> <div> IoTmaxx GmbH Bultstrasse 5a </div> <div> 30159 Hannover </div> <div> </div> <div> Tel.: +49 511 936874-29 </div> <div> Fax.: +49 511 936874-33 </div> <div> </div> <div> Sitz der Gesellschaft: Hannover, Amtsgericht Hannover HRB 220223, USt-IdNr.: DE326326282 </div> <div> Geschäftsführer: Christian Lelonek </div> <div> </div> <div> Diese E-Mail kann vertrauliche und/oder rechtlich geschützte Informationen enthalten. </div> <div> Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. </div> <div> Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail oder von Informationen daraus ist nicht gestattet. </div> <div> </div> <div> This e-mail may contain confidential and/or privileged information. </div> <div> If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. </div> <div> Any unauthorised copying, disclosure or distribution of the information contained in the e-mail is strictly forbidden. </div> <div> </div> </div> </div> </div> </div> </body> </html>