Hi I have a EM7455 modem running on my Linux board. I noticed that sometimes it takes a very long time after changing the APN to a valid value for the modem to attach to the LTE network and acquire an IP address. Once it took more than 82 seconds. Is this normal behavior?
Have you tried to detach then attach on modem after changing APN?
May I know the AT commands ?
If the unit is attached to LTE and you change the APN in CID1 then I would suggest it is good practice to reset the unit as you are changing the APN upon which the default bearer is based. By resetting the unit you are eliminating all sorts of possible timers and conflicts.
Can I reset the unit without causing a enumeration of the USB? If so, how?