14 Oct
2019
14 Oct
'19
5:22 p.m.
Hi Alan.
On Mon, Oct 14, 2019 at 10:19:53AM +0100, KageDS wrote:
I seem to be hitting a strange problem trying to use a
sysmoQMOD with Ofono
and a Telit Modem (HE910)
There seems to be a window of around 30 seconds after starting
osmo-remsim-client-st2 whereby ofono cannot talk to the modem.
Neither I nor sysmocom has any experience specifically with Telit
modems.
I suggest to reduce the problem domain:
* does the modem exhibit that "window" even if used with a physical simcard in
QMOD?
* does the modem exhibit that "window" even if used with a physical simcard in
some
other boards (e.g. the OSmocom mpcie-breakout)?
* what kind of USB bus activity (e.g. re-enumeration) do you see?
It seems that switching from physical SIM to remote
SIM causes the modem to
lock-up for a while.
It is not possible to switch from remote to local or vice-versa without having the
modem powered off, or without having the modem in reset during that time, or at least
issuing a reset after you have switched.
In theory the 3GPP specifications allow for a SIM card to be changed
while the UE is running. However,in practise all implementations I've
seen in the past 10+ years are lazy and even those modems that actually
detect this event properly will simply respond to a reset of (at least)
the baseband processor.
So maybe what you're observing is simply the modem rebooting at that point?
Regards,
Harald
--
- Harald Welte <laforge(a)osmocom.org> http://laforge.gnumonks.org/
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