<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> Hi Aleksander, Many thanks for your response. That is a BIG BIG HELP -- as I currently have to stop the MM service and restart it in debug mode, just to query some settings. I then change settings if necessary and then stop/restart MM in non-debug mode. All that takes a bit of time. I've just discovered that MM 1.18.0 is available in `buster-sloppy` distro - part of Debian Backports, so that looks like the way forward for now. Again, many many thanks !! Cheers, Brendan. -- <div class="moz-cite-prefix">On 14/6/2022 6:01 pm, Aleksander Morgado wrote: </div> <blockquote type="cite" cite="mid:CAAP7ucL8Kpv9JwPijqYZV+Zemd+JJXLSAz3+pNfKF2E3-9RLJw@mail.gmail.com"> <pre class="moz-quote-pre" wrap="">Hey, On Tue, Jun 14, 2022 at 9:53 AM Brendan Simon <a class="moz-txt-link-rfc2396E" href="mailto:Brendan@brendansimon.com"><Brendan@brendansimon.com></a> wrote: </pre> <blockquote type="cite"> <pre class="moz-quote-pre" wrap=""> Hello, I have a number of embedded linux boxes with Quectel EC21 4G modems, connected to various cellular networks (AT&T, Verizon, ...). AT&T are removing 3G from some areas and the modems are not reconnecting. My devices are vanishing off the face of the Internet. Quectel have provided some assistance and guidance and advised to configure some settings for AT&T Sunsetting. The UE Usage Setting was changed to configure the device as Data Centric (i.e. no voice), however it did not resolve the issue. AT&T provided some assistance - apparently the APN was wrong. Seems like some generic APNs are being used and not the APN specified in the NetworkManager configuration. This all worked ok when 3G was available. AT&G also suggested the PDP settings of the modem are the issue. Changing the default PDP context (#!) from an APN of "" to the provided APN seems to have resolved the connection issue. I have used `mmcli -m N --command="..." to modify the PDP context for testing. I feel this is hacky and shouldn't be required. Is there a better (more elegant and generic method) to set the PDP contexts so modems (preferably any brand) will work on 4G only networks? </pre> </blockquote> <pre class="moz-quote-pre" wrap=""> The way to elegantly change the APN settings for the initial EPS default bearer would be using e.g.: $ mmcli --3gpp-set-initial-eps-bearer-settings='apn=something' In QMI-based modems as the EC21, this would internally change the profile associated to the initial bearer. </pre> <blockquote type="cite"> <pre class="moz-quote-pre" wrap="">NOTE: we are using Debian Buster with ModemManager 1.10.0. Would upgrading MM help? Buster-Backports has 1.14.0 available, which would be easy to build/install on the existing OS. </pre> </blockquote> <pre class="moz-quote-pre" wrap=""> The QMI-based initial EPS bearer settings update was implemented in commit 5613215db8 (November 2020), which was released with ModemManager 1.16.0. The latest update in the 1.16.x series is 1.16.10, but the series is now fully unsupported; the latest supported series is 1.18.x. </pre> </blockquote> </body> </html>