I added the line with otasn, and it actually worked a lot better! Thank you
for that tip! I made several tower handoffs with no drop in connection.
However, when I traveled through a low signal area, the connection dropped and
MM never tried to connect again. If I did a: "ifup wwan", MM came back with a
new bearer (the bearer number increased) and I got my connection back, but with
a new IP address.
Is there a way to force MM to try to connect again if it drops from Connected
back to Registered?
From: Russ Westrem <lspwaterproof...@gmail.com>
To: ModemManager <modemmanager-devel@lists.freedesktop.org>
Sent: Tuesday, December 18, 2018 6:45 PM
Subject: Re: OpenWRT Sierra EM7455 drops connection while driving
On Dec 17, 2018 at 2:26 PM, <Peter Krause> wrote:
I have a Sietta EM7455 LTE modem in a recent Lede build: OpenWrt SNAPSHOT
r6550-83e1fceI'm using a USA Sprint SIM. I did the AT commands to add the
Sprint bands and put the modem in MBIM mode.ModemManager is v1.8.0
/etc/config/network has the following block:config interface 'wwan'
option _orig_ifname 'wwan0' option _orig_bridge 'false' option
proto 'modemmanager' option device
'/sys/devices/platform/ehci-platform/usb1/1-1' option apn 'r.ispsn'
option auth 'none'
When ModemManager starts, no problems with connection. It comes right up, and
mmcli says it's in connect mode.
When I drive, the connection is fine for a while, then drops and I can't bring
it back without rebooting the router. I tried "/etc/init.d/modemmanager
restart" and it will say it has re-connected, but I can't ping out. When I
reboot the router, everything comes back immediately on bootup and I can browse
again.
I put the modem in debug mode and drove around until it failed, attached are
the mm.log from ModemManager in debug mode, and the /var/log/messages from
Lede/OpenWRT
mm.log: https://pastebin.com/GY6k9Qykmessages: https://pastebin.com/aitKE0Mb
Any clue why it won't work while driving around town? It seems like it can't
recover from a tower handoff, but I know the Sierra EM7455 is supposed to be
able to handle that.
ThanksPeter Krause
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You need to add cgdcont=3,"IPV4V6","OTASN"
Sprint seems to need this second apn for tower handoffs.
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