My situation:
I’m experiencing an issue with my FMC920 (firmware 03.29.00 Rev21) located in South America. The device works correctly in general, but shows problematic behavior:
Problem:
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GPS sends data normally to my server
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When passing through areas without cellular coverage, it disconnects (expected behavior)
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The issue: When returning to areas with good coverage (city center where other GPS devices work fine), it does NOT automatically reconnect
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These disconnections can last for days until it finally reconnects on its own
Analysis from .dmp file via FOTA Web: The error that constantly appears is related to SIM card initialization:
[AT.RSP]
SIM card is not initialized yet
[AT.SEND]
ERROR @ m2m_at_cmd_api.c(298):CMD failed. Try:2
[AT.RSP]
SIM card is not inserted.
[MODEM]
Setting PWR state 1->0
[MODEM]
Changing Modem State from:1 to:2
[SCH]
Task eM2M_Tid_ModemInit[8] has been scheduled. Period: 5s
Additional details:
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SIM card has not been physically removed
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Device has internet access when working
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GPS gets fix correctly (GPS Fix: 1, GPS state: 1)
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Normal battery voltage (BatV: 4070, ExtV: 13654)
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The issue seems to be specifically with modem/SIM reconnection
Has anyone experienced this behavior? Is there any specific configuration I should check to improve automatic reconnection after coverage loss?
Any suggestions would be greatly appreciated.
Thanks in advance.