Forcing 3g Connection on MSOM 524

Firmware
1

I have devices that jump between LTE and 3g. 3g is getting strong signal strength, but LTE is very low (15-20%) and 3g is strong (~80%).

I want to try locking the modem to 3g. Is that possible?

Thanks!

2

There isn't an automatic way to do this. There are two possible ways that I can think of:

With Device OS 6.4.0 and later, you can use Environment PARTICLE_CELLULAR_FORBIDDEN_BANDS you should be able to disable all of the bands, which really only specifies the LTE bands. The default setting should still be used for 2G/3G. I have not tested this, so I'm not positive it will work, but I think that's how it's supposed to work.

With the EG91-EX cellular modem (M524), you can use the AT+QCFG="nwscanseq" command to search 3G then 2G only (030201) instead of automatic (00). The cellular modem needs to be restarted after changing this setting, which I think is sticky.

3

Thanks @rickkas7 , I will give that a try.

4

Make sure you are using the correct antenna for the M524. That level of LTE performance is not expected.