Hey Karsten! > We have upgraded some of our units from a old version of openwrt to a new > openwrt version with ModemManager. > Several of the update works OK. But other update fails. The main symptom is > modem manager do not connect > Reboot of CPU which run openwrt do not change anything. Nor reboot the > Quectell modem change the situation > > New SW versions are > OpenWrt 19.07.2 > ModemManager daemon 1.14.12 > mmcli 1.14.12 > > We have noticed suspicious differences when using the mmcli -m xx cmd on unit > which work OK contra on unit which fail after upgrade.Remark the missing > parameters on fail unit > The suspicious differences are: > group parameter value on fail unit value on > OK unit > ----------------------------------------------------------------------------------------------------- > Hardware carrier config Commercial-TMO_VoLTE > ROW_Generic_3GPP > System drivers option, qmi_wwan > qmi_wwan, option
I don't have a clear explanation as to why in one case no SIM is detected, while it is in the other case, but this carrier config difference you point out here is a very important one. My suggestion would be to try to install the generic 3GPP carrier config in the modem that reported the missing SIM, and see what happens. You should definitely contact Quectel to try to see if they can spot what the reason could be. Also, try to ask the question in the Quectel forum if your Quectel contact doesn't give you a good answer: https://forums.quectel.com/c/iot-module/lte-standard-module/33 Another thing. In order to make sure it is not a timing issue, if you boot the system and restart ModemManager after some minutes, is the SIM still reported as missing? -- Aleksander
