<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="DE" link="#2D8DAB" vlink="black" style="word-wrap:break-word"> <div class="WordSection1"> Good evening,<o:p></o:p> <o:p> </o:p> my name is Dominik Nille and I am currently trying to work with a 5G modem (Quectel RM520N-GL) to log into a cellular network.<o:p></o:p> I am able to connect the Modem when using Windows or a Raspberry Pi. But somehow my current system to set up a development environment does not work.<o:p></o:p> <o:p> </o:p> My setup:<o:p></o:p> I use a laptop with operating system: Windows 10 Enterprise<o:p></o:p> To run Linux in a virtual machine I use: Oracle Virtualbox<o:p></o:p> My Linux: Debian GNU/Linux 12 (Kernel Version: 6.1.0-20-amd64 (64-bit)<o:p></o:p> Version of ModemManager: 1.20.4<o:p></o:p> Version of NetworkManager: 1.42.4<o:p></o:p> <o:p> </o:p> I try to connect an Evaluation Board, named “RMU500EK 5G Development-Kit” ( <a href="https://shop.tekmodul.de/RMU500EK-p541645397with">https://shop.tekmodul.de/RMU500EK-p541645397with</a> ) with integrated antennas via USB. Therefore, I set an USB-Filter to connect USB devices from Quectel to the Linux VM automatically.<o:p></o:p> I’ve now tried Multiple of those Boards with multiple of 5G modems and I also updated the firmware of the different modems. I tried different power supplying methods. With different connectors and also different USB-cables. I don’t think that the problem is a hardware setup problem, because I can run the modem without a problem on the windows host.<o:p></o:p> <o:p> </o:p> Investigating the problem in linux:<o:p></o:p> <o:p> </o:p> When I run lsusb following output is displayed:<o:p></o:p> Bus 002 Device 006: ID 2c7c:0801 Quectel Wireless Solutions Co., Ltd. RM520N-GL<o:p></o:p> <o:p> </o:p> When I run ls /dev, there are listed the 4 serial devices and 1 modem device.<o:p></o:p> cdc-wdm0, ttyUSB0, ttyUSB1, ttyUSB2, ttyUSB3<o:p></o:p> <o:p> </o:p> Previously, I used the NetworkManager in combination with the ModemManager to get a connection on the same setup to monitor my cellular connections. Maybe I updated some packages or changed something else on the system.<o:p></o:p> However, I am currently not able to access the Modem with the ModemManager, but I don’t know the reason.<o:p></o:p> <o:p> </o:p> When I run mmcli -m any there is displayed the following output:<o:p></o:p> error: couldn't find modem<o:p></o:p> <o:p> </o:p> If I investigate the journalctl I see, that some outputs. The following are some main outputs:<o:p></o:p> <warn> [plugin/quectel] could not grab port ttyUSB0: Cannot add port 'tty/ttyUSB0', unhandled port type<o:p></o:p> ..<o:p></o:p> <warn> [modem1] couldn't load carrier config: Operation timed out<o:p></o:p> ..<o:p></o:p> <error> [modem1] port cdc-wdm0 timed out 25 consecutive times, marking modem as invalid<o:p></o:p> <warn> [modem1] couldn't load hardware revision: QMI operation failed: Transaction timed out<o:p></o:p> <warn> [modem1] couldn't load equipment identifier: QMI operation failed: Transaction timed out<o:p></o:p> <warn> [modem1] couldn't load device identifier: Modem interface skeleton unavailable<o:p></o:p> <warn> [modem1] couldn't load supported bands: Couldn't peek QMI port<o:p></o:p> <warn> [modem1] couldn't load power state: Couldn't peek QMI port<o:p></o:p> <warn> [modem1] couldn't load current allowed/preferred modes: Couldn't peek QMI port<o:p></o:p> <warn> [modem1] couldn't load current bands: Couldn't peek QMI port<o:p></o:p> <warn> [modem1] (quectel) failed to initialize SIM hot swap ports context: Couldn't get primary port<o:p></o:p> <warn> [modem1] couldn't query SIM slots: Couldn't peek QMI port<o:p></o:p> <warn> [modem1] modem couldn't be initialized: Couldn't check unlock status: Couldn't get interface skeleton<o:p></o:p> <warn> [modem1] error initializing: Operation was cancelled<o:p></o:p> <o:p> </o:p> Do you have any Idea, why the ModemManager is not able to grab the serial port? This happens very often with multiple ports.<o:p></o:p> And do you have any idea, why the port cdc-wdm0 is timing out 25 consecutive times? Is there any present issue with bridging USB-Ports of Virtualbox maybe?<o:p></o:p> <o:p> </o:p> Maybe the given information is already enough for you, to see the problem.<o:p></o:p> <o:p> </o:p> If not, I investigated further:<o:p></o:p> I also ran the ModemManager in Debug mode and captured the output in a log.txt, which is attached. I just cut off some beginning when the ModemManager was dealing with ethernetports. I plugged in the Modem after starting it in debug mode. And the attached output were captured.<o:p></o:p> <o:p> </o:p> Thank you very much for your help.<o:p></o:p> <o:p> </o:p> Best regards,<o:p></o:p> Dominik<o:p></o:p> </div> <div>Dominik Nille Technology Innovation Management <img alt="" hspace="0" src="http://assets.balluff.com/JPG_original_size/E-Mail-Footer_Vertrieb_Logo.jpg" align="baseline" border="0"> Balluff GmbH · Schurwaldstrasse 9 · 73765 Neuhausen a.d.F. · Germany Phone +497158173-8020 · Fax +4971585010 · <a href="mailto:Dominik.Nille@balluff.de" style="color: black"> Dominik.Nille@balluff.de</a> · <a href="http://www.balluff.com" target="_blank" style="color: black"> www.balluff.com</a> <a href="https://de-de.facebook.com/balluff.gmbh" target="_blank" style="color: black"><img height="26" border="0" src="https://assets.balluff.com/raw-approved/ic/on/facebook_icon.png" alt="Facebook"></a> <a href="https://www.linkedin.com/company/balluff-gmbh-germany" target="_blank" style="color: black"> <img height="26" border="0" src="https://assets.balluff.com/raw-approved/ic/on/linkedin_icon.png" alt="LinkedIn"></a> <a href="https://twitter.com/balluff?lang=de" target="_blank" style="color: black"> <img height="26" border="0" src="https://assets.balluff.com/raw-approved/ic/on/twitter_icon.png" alt="Twitter"></a> <a href="https://www.youtube.com/user/BalluffSensors" target="_blank" style="color: black"> <img height="26" border="0" src="https://assets.balluff.com/raw-approved/ic/on/youtube_icon.png" alt="Youtube"></a> <a href="https://www.xing.com/companies/balluffgmbh" target="_blank" style="color: black"> <img height="26" border="0" src="https://assets.balluff.com/raw-approved/ic/on/xing_icon.png" alt="Xing"></a> <a href="https://www.innovating-automation.blog/?lang=de" target="_blank" style="color: black"> <img height="26" border="0" src="https://assets.balluff.com/raw-approved/ic/on/blog_icon.png" alt="Blog"></a> Place of incorporation/Sitz der Gesellschaft: Neuhausen a.d.F., Germany · Register court/Registergericht: Amtsgericht Stuttgart, Germany Trade register/Handelsregister: HRB 214038 · Managing directors/Geschäftsführer: Katrin Stegmaier-Hermle, Florian Hermle, Frank Nonnenmann Chairman board of directors/Vorsitzender des Aufsichtsrats: Michael Unger · VAT ID/USt-ID: DE213 402 337 <img alt="" hspace="0" src="http://assets.balluff.com/JPG_original_size/E-Mail-Footer_Vertrieb_Claim.jpg" align="baseline" border="0"> </div> </body> </html>