Hello! I am developing an application making use of libmm-glib high level API and I am using a EM7455 Sierra Wireless modem. The modem is working under MBIM mode (usb-composition).
I believe the issue I am experiencing is related to the *change of operator / SIM card*. The scenario is the following: 1. The first SIM card I introduce is able to register in the network and connect using the APN I specify in order to establish a connection. 2. I tell the modem to change the SIM card via internal AT command and I perform a system reboot (just to ensure everything starts fresh) 3. After the reboot and after waiting some time (>5-10 minutes) the Modem is not able to register in any network and the signal quality is never updated. Modem remains as shown * --------------------------------* * Status | lock: sim-pin2 | unlock retries: sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10) | state: enabled | power state: on | signal quality: 0% (cached)* *-------------------------------------------* and it never transitions to a "registered" state, which I understand should be automatic. I have tried the following commands in order to force the network registration mmcli -m 0 --3gpp-scan --> OK mmcli -m 0 --3gpp-register-in-operator=xxxxx --> Returns: " error: couldn't register the modem: 'Timeout was reached' " My questions are: - Should signal quality be retrieved independent of the register state? Does it depend on the modem registration status ? - Is there any *connection related configuration* that either the *modem device or the ModemManager may be storing* ? If this would be the case, how could this information be erased? - Is there any way to ensure that the modem connection / register parameters are reset to factory default ? Thank you very much, any help will be appreciated. -- Kind regards, Alejandro Vega
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