On Fri, Sep 03, 2021 at 10:08:52PM +0000, Cord wrote: > > > > > > > It looks like it is probably a Qualcomm-based device. It seems likely > > > > that as things are now, it will attach to umsm. I can't say for sure if > > > > it will work or not though I think there is a fairly good chance. > > > > But unless you are lucky and somebody already used the same device, > > > > you will need to buy one to find out for sure. > > > > If it does work, while attached to umsm there should be several com > > > > interfaces presented, one of which is likely to accept AT commands > > > > so you can find strength that way. For umsm, you will need to mess > > > > about with pppd to get it to connect to the internet. > > > > The device would probably support working with umb(4) but would need > > > > some extra work (maybe as simple as moving the vendor/product ID to umb(4), > > > > but it may need more...so far I have a success rate of about 33% with umb > > > > devices, including some devices which are even listed in the manpage - > > > > the firmware on the device matters too, not just the chipset). > > > > There is no support for displaying signal strength directly via umb, > > > > and the other com ports are only available via umsm, so in that case you > > > > can't send AT commands to find it either.. > > > > This device is cat4 only (no MIMO, no channel aggregation) so speed won't > > > > be amazing. > > > > > Hello, thank you very much for your help. > I bought the toy and it seems it works, but it stuck when I run fw_update at > around 10% or 20%. In the log I found messages like: > ppp0: bad fcs 59f8 > ppp0: bad protocol 728a > ppp0: packet too big > ppp0: bad fcs baf0 > ppp0: bad protocol debc > ppp0: bad fcs and so on. > > The strange thing is that when I press ctrl+c to break the ppp connection I > lose all the connections I have with box. I mean lan and serial connections. > I don't know if the box is stucked or it's just the connection. But I find > very strange that I lose the serial connection. Obviously the box is > headless. It's just a simple > raspberry. > FCS stand for "Frame Check Sequence" and it seems a kind of ppp checksum. > Maybe I'm in a spot where the signal is weak. I'll try to move the dongle.
I got mine yesterday. As sthen@ pointed out, this device would support working with umb(4). Using the following AT commands to switch into mbim mode: AT+CUSBPIDSWITCH=9003,1,1 AT+CLANMODE=1 You also need to apply the following diff, thanks. > Cord
