ModemManager fails to utilize Modem, when it is not ready yet

[Christian Schneider]

Hi, I have a SIMCOM_SIM7600E-H modem.


  Status   |             state: failed
           |     failed reason: sim-missing
           |       power state: on





Using the AT interface manually, I can notice this behavior:






BR, Christian

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When the Modem is freshly "activated" (eg. after powering on the whole device, toggling the MPCIE reset pin, unplugging/plugging the MPCIE card), ModemManager is not able to utilize the modem, it ends in state at this point, when I restart ModemManager (I don't do anything with the modem itself), it works, the modem is usable, calls, sms, internet connection work. I've looked at the debug output of ModemManager and found this: In the "bad" case, some of the AT commands fail, where the final straw for ModemManager seems to be "AT+CPIN?" that is answered with "+CME ERROR: 10" which is interpreted as "SIM not inserted" by ModemManager. In the "good" case the answer to "AT+CPIN?" is "+CPIN: READY" and ModemManager is happy. Directly after starting the modem, the answer to "AT+CPIN?" is "+CME ERROR: 10", only after some 30 seconds, the answer is "+CPIN: READY" I don't now the standards good enough, to judge if such behavior is allowed, but I'm pretty sure, that this behavior is the problem for ModemManager. When the answer to "AT+CPIN?" is "+CME ERROR: 10" once, it marks the modem as failed without retrying. I attach a complete log of ModemManager Debug output. ModemManager starts, when the device is "hot", eg running for a while, so everything is working. When the device is fully recoginzed by ModemManager, I toggle the Reset pin of the modem which causes the restart of the modem, the device disappeares from ModemManager, and after a while, when the /dev/ttyUSBx devices appear again, ModemManager starts talking to the modem, but get's errors, as it is too "early". As I said, I don't know, if this behavior of the modem is acceptable from the standard. Can someone comment about the behavior of the modem? Should I get to the manufacturer, and tell them, they do something wrong (and hope they fix it) or should ModemManager handle such a situation, eg by retrying?

mm.log
Description: Gaussian log