Modems disconnecting when signal level is low

[Aleksander Morgado]

Hey Melisa,

> I am currently trying to use two SIMCOM SIM8300G-M2 5G modems to test cellular performance (coverage, latency, throughput) from two different operators in a rural area. I have been experiencing some stability issues with the modem connections. It seems that it is related to the low signal level observed in the area where I am measuring. Whenever the signal level is low, or there is no coverage, the network interface is deleted, the modem disappears from mmcli list, and it reattaches automatically after a bit, when the signal level improves. This causes long (or at least longer than I would wish) interruptions in my tests. I include some logs below as an example of what I see whenever this occurs.
>

This is a clear indication of the modem crashing by itself :/ Maybe
the firmware is not stable enough under low signal conditions, or
something like that? The only thing you can try to solve this is to
contact the manufacturer and go through the support process, e.g.
providing them with QXDM log traces to analyze. You could also try to
upgrade to the newest firmware they have published.

-- 
Aleksander