On 2020-02-02 02:07, Michael Balzer wrote:
Dimitrie / Thomas just reported a very similar (same?) issue on a EU modem: https://www.openvehicles.com/node/2401 <https://www.openvehicles.com/node/2401#comment-6228>
I have one modem that seems to do this every 1-2 weeks. This weekend I finished a mqtt to nagios bridge so I can tell *when* the modem isn't happy.
He managed to get a log from the issue, which shows the MUX startup to be broken and remain broken until power down.
Specifically, MUX port 2 (just that one) gets stuck in some error state, which does not resolve by a soft power cycle. Thomas also found out even a short hard power cycle won't be sufficient to resolve this:
What I found is that when the modem is stuck, it no longer responds to AT commands and cycling the PWR pin has no effect.
I found out, when i powered off and 1-2 sec. later on again. the modem got stuck. when i power it off and wait 1 minute and then power it on. it will start normal.
I usually count to 10 before replugging.
His modem firmware version is 35316B12SIM5360E (B12).
@Thomas: there is a B13 available…
I've found later versions (up to B13) and release notes listed only here: https://techship.com/products/simcom-sim5360e-mpcie-sim/
…but you need an account to access them and must accept an NDA.
If you feel lucky you might try that. But it's also possible this is a hardware flaw in all SIM5360 versions.
I registered/nda'd and while I have B09 through B13 of the sims5360E firmware but have never found any US versions. I have three modules/modems, two arew B07 (35316B07SIM5360A), one I unsoldered to replace with a sim7600a but is likely the same. Craig