Hi Denis,
On 19/08/2019 21.55, Denis Kenzior wrote:
Hi Martin,
On 8/19/19 2:29 PM, Martin Hundebøll wrote:
Does ofono have a way to handle lacking OK/error messages? I seems
like my modem (Quectel M95) is buggy when it comes to unsolicited
indications and (as far as I have seen) SIM commands:
> AT+CRSM=178,28614,3,4,8
< +CRSM: 144,0,""
< OK
> AT+CRSM=178,28614,4,4,8
< Call Ready
< +CREG: 5,"0119","04EA"
The "Call Ready" indication causes a lacking "OK" from the preceding
"AT+CRSM" command. This has happened with other CRSM commands, and can
also be caused by an unsolicited +CREG indication.
Eww. Get your vendor on the phone ;)
They are involved. Hopefully they'll come back with something useful :)
I guess one way handle it, is to to glue op the URC listeners to peek
into the AT command queue and check if a command is pending for
OK/errors, and retry it if so.
Anyway, generally we can't peek ahead. GAtChat just doesn't work this
way. Also, handling unsolicited notifications interleaved with AT
command responses is why it is a good idea to provide a list of prefixes
of the expected responses to g_at_chat_send. That tells GAtChat which
lines to consume as a 'response' and which to allow through for
unsolicited notification processing. If you provide a NULL prefix, then
everything is consumed as a 'response'.
OK
But that could cause unexpected side effects depending on the retried
command...
I'm not really even sure what to suggest as a workaround to try here...
If you have multiple TTYs to play with, maybe fork off one dedicated to
+CRSM and disable all unsolicited notifications on it?
There's four tty's of which only two are currently used. I think I'll
try with a dedicated tty for the SIM handling.
Thanks for the pointers.
// Martin
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