Hey,
> > > After updating to the latest main (at eda130f3bf1c), in our team > > > we've noticed, that in our CI, that QMI port sometimes fails to > > > probe, > > > with Telit LE910C4-WWXD. The result is the modem having only AT > > > ports > > > available, thus falling back to using PPP for the data connection. > > > > Well that's not awesome; I'll dig into it. If you figure out anything > > too, let me know. > > > > When this happens, does MM attempt to probe the port as AT before > trying QMI? > > With the changes in that referenced commit, it looks like serial_probe_step() may be running serial_open_at() also for the QMI and MBIM ports, which is not right, as that would create a new MMSerialPort in ctx->serial. The serial_probe_step() (ideally renamed as probe_step() to make it clearer that it is not serial-specific) should not run any serial-specific operation (e.g. CUSTOM_INIT, AT_OPEN_PORT, ....) for ports that do not require any AT or QCDM probing. WDYT?
