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[Sai Chaitanya]

Hi,

I am trying to configure and control a Sierra modem (RC series) connected
to my Linux PC with an experimental code put together from different
sources in the internet and libqmi API manual. The sample code is attached.
I am not sure if there is any issue with the way I am using the libqmi
APIs, but the code seems to work for most of the time, but rarely it gets
stuck in g_poll() even though I am using timeouts in each and every libqmi
API used.

#0 0x0000007fb0297e6c in _*GI*__poll (fds=fds at entry=0x7fdea36d30,
nfds=nfds at entry=1, timeout=timeout at entry=-1)
at /usr/src/debug/glibc/2.36-r0/sysdeps/unix/sysv/linux/poll.c:41
#1 0x0000007fb04a7c6c in g_poll (fds=fds at entry=0x7fdea36d30, nfds=nfds at entry
=1, timeout=timeout at entry=-1)
at /usr/src/debug/glib-2.0/1_2.72.3-r0/glib/gpoll.c:125
#2 0x0000007fb06e7708 in g_unix_input_stream_read (stream=<optimized out>,
buffer=0x7fdea36d78, count=2048, cancellable=0x0,
error=0x7fdea36d70) at
/usr/src/debug/glib-2.0/1_2.72.3-r0/gio/gunixinputstream.c:348
#3 0x0000007faf128960 in input_ready_cb (istream=0x558e7c5660,
self=0x558e7c4f10)
at /usr/src/debug/libqmi/1.32.4-r0/src/libqmi-glib/qmi-endpoint-qmux.c:73
#4 0x0000007fb0497f7c in g_main_dispatch (context=0x558e7527f0) at
/usr/src/debug/glib-2.0/1_2.72.3-r0/glib/gmain.c:3417
#5 g_main_context_dispatch (context=context at entry=0x558e7527f0) at
/usr/src/debug/glib-2.0/1_2.72.3-r0/glib/gmain.c:4135
#6 0x0000007fb049832c in g_main_context_iterate (context=0x558e7527f0,
block=block at entry=1, dispatch=dispatch at entry=1,
self=<optimized out>) at
/usr/src/debug/glib-2.0/1_2.72.3-r0/glib/gmain.c:4211
#7 0x0000007fb04986a8 in g_main_loop_run (loop=0x558e752b90) at
/usr/src/debug/glib-2.0/1_2.72.3-r0/glib/gmain.c:4411

The same code works fine with no issues with a 4G dongle. I am not sure if
there is any limitation in the Sierra modem or any unhandled case in
libqmi, specific to this Sierra modem I am using. Any inputs that can shed
some light onto this issue are highly appreciated.

Kind regards,
Sai.
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