Hey, > On 3/8/22 15:21, Aleksander Morgado wrote: > > If I'm not mistaken, in Intel chipset based modems, CID=0 is used to > > handle the initial default EPS bearer; i.e. the bearer that gets > > automatically setup when the modem gets registered in the network. If > > +GTRNDIS isn't able to handle attempting a connection over that > > bearer, we should definitely try to use CID>=1 instead. This is > > probably something to handle in the Fibocom plugin itself. > > I believe you're right that I'm looking at the default EPS bearer. What > would be the simplest way to only use CID>=1 for Fibocom modems? The > fibocom plugin uses the default connect_3gpp method for context > selection, configuration etc. Is there a simple way to restrict the CID? >
The way to restrict the CID range to >= 1 would be to subclass the check_format() method in the MMIfaceModem3gppProfileManager, so that it returns a "min_profile_id" equal to 1. For that, you could just call the "parent" check_format() method, in order to use the generic +CGDCONT=? operation, but then overwrite the "min_profile_id" you get there (assuming you get 0) and return 1 instead in that field. > Speaking of the default EPS bearer, should ModemManager be aware of that > bearer somehow, i.e. list it as an active bearer object etc? > Yes, we could do that, definitely. There is no chance of getting the profile id wrong in Intel-based modems I think, if they support CID 0, that should be the one used for the initial EPS bearer. -- Aleksander https://aleksander.es
