EC25 Modem Initialization Failure

[rdecarre11]

Similar to a lot of folks out there

Critical issue with ModemManager

Hi I’ve started encountering an issue where the modem is unable to register itself to the cellular network. This is a major problem for devices running in production. I’m using the IOT-GATE-IMX8 paired with a SIMCOM_SIM7600G modem. In this instance the device is running balenaOS 4.1.3+rev2 I’ve written another post about this issue in the past Modem manager doesn't reconnect properly The issue appears as follows: Operator issues a disconnect to the modem Modem is unable to reconnect, cont…

Balena Fin Cell Modem Failure

Hello, We have an application deployed on the Balena Fin that requires use of a cell modem. (We typically use the Quectel EC25 modems.). We have deployed our solution to many installations and it generally works well. However, we have seen occasions where a device suddenly goes offline and never recovers, even though the user has not unplugged it. I added application code that detects when the gateway has not communicated with our servers for a while, and reboots the gateway using the follo…

EC25 Modem failing to initialize

EC25 on Compulab IOT-GATE-iMX8PLUS 2G-4G DRAM fails to initialize until the ModemManager service is restarted. Upon a boot or reboot, the Modem Manager Logs look like this: Mar 26 19:32:25 localhost ModemManager[1194]: ModemManager (version 1.22.0) starting in system bus... Mar 26 19:32:29 d3bc7f7 ModemManager[1194]: [device /sys/devices/platform/soc@0/32f10108.usb/38200000.usb/xhci-hcd.2.auto/usb3/3-1/3-1.3] creating modem with plugin 'quectel' and '6' ports Mar 26 19:32:29 d3bc7f7 ModemManag…

Modem manager doesn't reconnect properly

Hi! I’ve encountered an issue a handful of times where the modem does not reconnect properly until reset (re-activating the connection solves the issue) i.e nmcli con up xxx On this post Never reconnected after SIM desactivate/activate I found that it may be that the mobile operator issues a disconnection and the modem does not reconnect by itself. I have a gut feeling that this may be the same issue as what I am experiencing. This has happened two or three times now, rendering the device unre…

I have a Quectel EC25 connected to a Raspberry Pi CM4 in an Edatec Cm4 Sensing. We have 10 devices deployed and about half of the time, the modem doesn’t initialize properly. We also have a number of devices on which the modem was up, then drops out for a period of time. Basically only a power cycler will work in some cases.
This is a product we’re looking to scale, so, we need help getting ModemManager, NetworkManager and this modem to work reliably.

[TimoAtMUV]

Hey, we use many different CM4 based devices with EC25 modems and have no problems at all.

In our experience, however, there are a few steps that are extremely important to follow:

Configuration adjustments:

• Enable UART (sometimes)
• DT parameters must be adjusted correctly
• DT overlays must be adjusted correctly
• GPIO pins must be adjusted correctly

Mostly required custom configuration:

• RESIN_HOST_CONFIG_otg_mode = 1

Often some files have to be added to the device after flashing

• boot/overlays folder
• boot folder

What are your settings regarding these points?

[rdecarre11]

Thanks for the help! The manufacturer recommended the dtoverlays and params. None of them were specifically addressing the Modem, though.
They also recommended that I reboot the modem on start (a little nuanced in container-land), they have a GPIO attached to the Modem. Doing so once at the start has worked well. There are still times where the modem will show in modem manager’s journal as “unusable”.
Other than writing code to catch that state and reset it again, I am unsure of what to do.