On Fri, Jan 08, 2021 at 05:13:52PM +0100, Patrick Wildt wrote: > Am Fri, Jan 08, 2021 at 02:29:02PM +0000 schrieb Peter Kay: > > There appear to be no 4G modem support at the moment, specifically a > > mini PCI-e one so I can stick it in a PC engines apu4d4 and have a > > backup connection. > > > > Presuming a driver would need to be written, but just checking if I've > > missed anything? > > There's umb(4). It supports USB's MBIM standard. There are some MBIM > compatible chips around, one for instance is this one: > > https://www.varia-store.com/de/produkt/87272-simcom-sim7600e-h-mpcie-eu-lte-cat-4-modul.html > > You'll probably need to switch it into MBIM mode once via a specific > AT-command over the serial, but otherwise it should do. > > I'm sure there are plenty of other MBIM-compatible devices, this is just > the one from the top of my head.
I have umb(4) working on an APU1 board. It's a Sierra Wireless EM7345, the one shipped with x250 Thinkpads. Installation in an APU requires a compatible M.2 to miniPCIe adapter. Make sure to get an adapter with the correct M.2 keying. If the vendor advertises GSM/UMTS/LTE modem support the adapter should work. If they don't, better ask before buying. This combo works fine in the middle miniPCIe slot of the APU. You'll need a full size SIM card for the SIM card slot. Again, an adapter will help to fit a micro or nano SIM. You will also want LTE antennas and compatible pigtails. Using wifi antennas will result in about 50% packet loss.