> On 10 March 2017 at 16:37 Aleksander Morgado <aleksan...@aleksander.es> wrote: > > On Fri, Mar 10, 2017 at 5:24 PM, Tom Hayward <t...@harbortronics.com> wrote: > > > I'm a new user of ModemManager and trying to understand the scope of > > the software. > > > > I've used ModemManager successfully with a cdc-wdm modem. It created a > > wwan0 interface where I could use a dhcp client and then route > > packets. > > > > Now I have a cdc-acm modem that requires running pppd on /dev/ttyACM0. > > I have a pppd and chatscript config to initialize it, a ppp0 interface > > is created, and I can route packets over it. Can I do any of this with > > ModemManager? I've found that I can use --simple-connect="apn=xxxx" to > > get the modem state to change to "connected", but it does not create a > > ppp0 interface on which to route packets. > > > > Is this a matter of configuration, lack of support, or simply outside > > the scope of ModemManager? Is there a way to use ModemManager to > > initiate the ppp connection? > > Initiating a ppp session is currently out of scope of MM. MM will put > the TTY in connected mode; then you need to (externally, another app) > launch pppd on the TTY that MM reported as "connected". > > The whole MM sequence is the same for TTY-only and QMI/MBIM+wwan > devices; just launch --simple-connect, if successful it creates a > bearer object that is in connected state. The bearer object will > report which is the data interface to use (which could be a wwan, or a > TTY) and also which method to use (ppp over the tty, or DHCP or Static > IP config over the wwan). An application that wants to use MM as modem > management and handle multiple modem types needs to handle all 3 > methods and use explicitly the one reported by MM (e.g. some modems > won't be able to use DHCP over a wwan and in that case static IP > setting needs to be performed). >
At the moment I'm working through other issues/compatibilities on a SysV-based system - it's just a simpler way to experiment and understand! But just prior to that I also did a systemd variant, and was *well* impressed that simply loading the modem driver could fire off not only MM but also the establishment of the ppp connection. As Aleksander points out, other manual steps are possible - I do a '--simple-connect' then a 'pon', and the IP connection is successful [aside from my other niggles]. It's mentioned by Aleksander in other threads here, but your ppp 'peers' file probably doesn't need too much to work. Just the pppd options needed, i.e. no need for a 'chat' script - MM will do the 'chat' for you. _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
