Hey I am building an embedded linux device using Yocto, that will transmit some data via GSM network. It will work in a rough conditions, poor GSM range, so it will switch SIM cards often to find the best network.
My question is - does the modem manager rewrites the current APN during each sim card switch? Or does it use already saved?
I am asking this, beacause I witnessed GSM modems' flash being killed after like 3 months, because of APN being rewrited on each network switch.
Thanks!
I used wireshark to sniff the communication - ModemManager overwrites APN setup each time.
Solution was to use qmicli, which creates profiles, and you can just choose which one to connect.