Static vs DHCP setups from ModemManager in OpenWrt

[Peter Naulls]

On 7/12/21 4:50 PM, Aleksander Morgado wrote:
> you should ifdown & ifup the network interface
> configured in netifd in order to reconnect.

No such luck: (sorry for the wrap)


hu Jul 15 13:31:11 2021 daemon.notice netifd: Interface 'wwan' is setting up now
root at AWC-EI:~# Thu Jul 15 13:31:11 2021 daemon.notice netifd: wwan (2113): modem 
available at /org/freedesktop/ModemManager1/Modem/0
Thu Jul 15 13:31:41 2021 daemon.notice netifd: wwan (2113): starting connection 
with apn 'firstnet-broadband'...
Thu Jul 15 13:31:52 2021 daemon.notice netifd: wwan (2113): error: couldn't 
connect the modem: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Cor'
Thu Jul 15 13:31:52 2021 daemon.notice netifd: wwan (2677): stopping network
Thu Jul 15 13:31:52 2021 daemon.notice netifd: wwan (2677): IPv4 connection 
teardown required in interface wwan: static
Thu Jul 15 13:31:52 2021 daemon.notice netifd: wwan (2677): running 
disconnection (common)
Thu Jul 15 13:31:52 2021 daemon.notice netifd: wwan (2677): Command failed: 
Permission denied
Thu Jul 15 13:31:52 2021 daemon.notice netifd: wwan (2677): error: couldn't 
disconnect all bearers in the modem: 'GDBus.Error:org.freedesktop.Modem'


As you mentioned, there's probably some logic missing here in OpenWrt. I'm
guessing the only recovery here is to restart ModemManager.

Here's some more debug if it helps:

root at AWC-EI:~#  mmcli --modem 1 --bearer=1
   ------------------------------------
   General            |           path: /org/freedesktop/ModemManager1/Bearer/1
                      |           type: default
   ------------------------------------
   Status             |      connected: yes
                      |      suspended: no
                      |      interface: wwan0
                      |     ip timeout: 20
   ------------------------------------
   Properties         |            apn: firstnet-broadband
                      |        roaming: allowed
                      |        ip type: ipv4v6
   ------------------------------------
   IPv4 configuration |         method: static
                      |        address: 10.55.89.75
                      |         prefix: 29
                      |        gateway: 10.55.89.76
                      |            dns: 107.112.229.135
                      |            mtu: 1430


Earlier, when it was running:

Wed Jul 14 11:50:45 2021 daemon.notice netifd: wwan (6178): modem available at 
/org/freedesktop/ModemManager1/Modem/0

Which looks like the modem here moved from 0 to 1 (I don't know how the number
allocation happens)

After restart of ModemManager and then ifup wwan, reconnection is successful.