<html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> Hi there, I got a Telit LE910C1-EU attached to an embedded device, using ModemManager 1.19.0 (main branch, 2 commits behind) and libmbim 1.27.3 (main branch, 1 commit behind). Linux Kernel is v5.12. I was able connect successfully to an LTE network using both PPP (USB profile 0x1201, 3 AT ports) and MBIM (USB profile 0x1252, MBIM + 2AT ports). Both configurations seem to work -- I was able to ping a server using those interfaces. But there are some inconsistencies that I see: <ul> <li>While PPP shows a signal quality of 85%, MBIM only shows between 9 and 19 % signal quality. (When I use a AT+CSQ command in MBIM mode, the result is 20 which is in the middle of the range, so I that should be more than 20%) </li> <li>While PPP does not show any sim lock, MBIM shows a SimPin2 lock (although we are connected). </li> </ul> So my question are: <ul> <li>Is it normal / ok to see those inconsistencies?</li> <li> Where do these inconsistencies come from? </li> <li>Where to start looking to fix those inconsistencies?</li> <li>Can I safely ignore the SimPin2 lock?</li> <li>What limitations do I get when I use PPP instead MBIM? </li> </ul> I have no experience with MBIM at all, so perhaps I got something wrong completely? BTW: I also tried RNDIS, but that is ignored by MM completely. Instead, the AT ports are used for PPP connection. I assume there is no support for RNDIS within the telit plugin? Thank you in advanced, any help appreciated .... :-) <pre class="moz-signature" cols="72">-- Best regards / Mit freundlichen Grüßen / Salutations distinguées Ulrich Mohr SEMEX-EngCon GmbH Carl-Merz-Strass 26 76275 Ettlingen Phone: +49 (0) 7243 5143596 email: <a class="moz-txt-link-abbreviated" href="mailto:u.mohr@semex-engcon.com">u.mohr@semex-engcon.com</a> ___________________________________________ Executive board: A. Stiegler, H.-J. Nitzpon Commercial register: Mannheim, HRB 718881 Company domicile: Ettlingen</pre> </body> </html>