Dear reader, We have used the WP7610 for some time now. With success, although we needed to set the modem image from ‘Verizon’ to ‘Generic’ as our devices are scattered around the North American continent. Now the WP7610 is replaced by the WP7611 because the former is hard to buy. Learning from the last time (since we’re in Europe), we haven sent first one sample to the USA for testing purposes. Of course, we made sure the modem works, and has the ‘Generic’ image active. But, due to no support of the modem for the European frequency bands; real testing will be in the USA. A remote laptop access is included such that we can access the device over it’s ethernet connection in case connection fails. The device itself will make a PPP connection automatically and has a webserver which we can access over VPN. Also, we can access the device using SSH over VPN. In addition, the device will transmit data now and then. This device is the same as all other devices but with a WP7610 modem. The only difference is the WP7611 modem. Well, I would not be here if there were issues. After a couple of times, we discovered we could access the device right after boot, but only for about 30 seconds or so. Later I found out that, if I brought the PPP interface down and up over the remote laptop connection, I could access it again, but only for a short time. This lead me to believe there were some routing issues; but they were OK. After some time I just made a test with a specific webpage that has a refresh button. Clicking on that will refresh the page each 2 seconds. I left it there for a few minutes, expecting that the connection breaks within a minute or so… But no… the connection was fine. Even after an 10 hours with no activity from my side, accessing is now without issues. We did not change much. The chatscript has an AT command CFUN=1. We also tried that manuall off and on, with no difference observed. Also, we could not get the device back in it’s original state where it breaks connection after 30 seconds or so. How on earth is it possible that, first connection breaks 30 seconds after getting online, and later it just remains open? What has caused that? What are possibilities that connection breaks in 30 s? Anyone with some hints will be much appreciated. Cheers, AJ

[image] anne.johan.de.vries: The device itself will make a PPP connection automatically and has a webserver which we can access over VPN. Do you mean the wp76 module will make ppp connection? Or the PC makes ppp connection via wp76 module? Have you verified if wp76 can establish data connection by cm command? How about using at!scact instead of ppp? [image] Example on establishing data connection by AT!SCACT via MBPL R20 driver Development tools Here is an example to establish data connection by AT!SCACT via MBPL R20 driver: Module: WP7609 FW: R13 MBPL: R20 PC Environment: Ubuntu 18 need to install the MBPL R20 driver for qmi_wwan and qcserial (MBPL_Drivers_USB_R20_ENG1-src.tar.gz) avoid the Ubuntu changing the network name: ln -s /dev/null /etc/systemd/network/99-default.link sudo apt-get install libqmi-utils sudo apt-get install udhcpc now insert the USB to PC sudo chmod 777 /sys/class/net/wwan0/qmi/raw_ip …

Ah… The PC with Linux Debian Stretch OS (rather outdated I know) running kernel 5.10 will make a PPP connection using the WP7611 modem. I didn’t know the WP7611 modem itself was capable of making a PPP connection… And sorry… don’t know what ‘cm command’ is… ‘at!scact ‘ are AT commands, right? PPP does that for me using a chatscript, right? Is it used just for verification? Or as a replacement for PPP? Since we have a number of other devices in the field (and more upcoming), the goal is to keep everything the same as much as possible. So, complete different ways of connection is not preferred unless there is a good reason for it…

Ppp is dial up via AT command At!scact is to establish data connection via qmi interface Here show how to use cm tool cm - Legato Docs legato™ is an open source Linux-based embedded platform designed to simplify connected IoT application development

WP7611 breaks connection it seems

IoT Modules

jyijyi March 24, 2026, 2:19pm 2

Do you mean the wp76 module will make ppp connection?
Or the PC makes ppp connection via wp76 module?

Have you verified if wp76 can establish data connection by cm command?

How about using at!scact instead of ppp?

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WP7611 breaks connection it seems

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