<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208540">I have a Sietta EM7455 LTE modem in a recent Lede build: OpenWrt SNAPSHOT r6550-83e1fce</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208541">I'm using a USA Sprint SIM. I did the AT commands to add the Sprint bands and put the modem in MBIM mode.</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208542">ModemManager is v1.8.0</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208543"><br id="yui_3_16_0_ym19_1_1544734562004_208544"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208545">/etc/config/network has the following block:</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208546">config interface 'wwan'</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208547"> option _orig_ifname 'wwan0'</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208548"> option _orig_bridge 'false'</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208549"> option proto 'modemmanager'</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208550"> option device '/sys/devices/platform/ehci-platform/usb1/1-1'</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208551"> option apn 'r.ispsn'</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208552"> option auth 'none'</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208553"><br id="yui_3_16_0_ym19_1_1544734562004_208554"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208555">When ModemManager starts, no problems with connection. It comes right up, and mmcli says it's in connect mode.</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208556"><br id="yui_3_16_0_ym19_1_1544734562004_208557"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208558">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.</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208559"><br id="yui_3_16_0_ym19_1_1544734562004_208560"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208561">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</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208562"><br id="yui_3_16_0_ym19_1_1544734562004_208563"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208564">mm.log: <a rel="nofollow" target="_blank" href="https://pastebin.com/GY6k9Qyk" style="color: rgb(25, 106, 212);" id="yui_3_16_0_ym19_1_1544734562004_208565">https://pastebin.com/GY6k9Qyk</a></div><div id="yui_3_16_0_ym19_1_1544734562004_208566">messages: <a rel="nofollow" target="_blank" href="https://pastebin.com/aitKE0Mb" style="background-color: rgb(255, 255, 255); color: rgb(25, 106, 212);" id="yui_3_16_0_ym19_1_1544734562004_208567">https://pastebin.com/aitKE0Mb</a><br id="yui_3_16_0_ym19_1_1544734562004_208568"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208569"><br id="yui_3_16_0_ym19_1_1544734562004_208570"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208571"><br id="yui_3_16_0_ym19_1_1544734562004_208572"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208573">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.</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208574"><br id="yui_3_16_0_ym19_1_1544734562004_208575"></div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208576">Thanks</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208577">Peter Krause</div><div dir="ltr" id="yui_3_16_0_ym19_1_1544734562004_208578"><br id="yui_3_16_0_ym19_1_1544734562004_208579"></div></div></body></html>