I’m using an AR300M16 actually with the 3.212-0512 snapshot version and tested three modems.
These modems are:
Huawei K3715
Huawei E3372H-320
D-Link DWM-222 A2
Sadly only the first one supported by default with non-tethering protocol. The last two needs a modswitch configuration. But with modswitch they all capable for PPP. D-Link can also capable for QMI. No matter which modem I use the interface does not show any informations about the modems. Only data usage infos available. I’m not familiar with AT commands so I cannot check via terminal what infos are readable from the modems.
But I checked the D-Link with uqmi
via terminal and looks like it can read any data from it. So it is possible to read. Then why the informations does not appear on the interface?