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From: Alexander Couzens <lynxis@fe80.eu>
Subject: how to handle ofono_netreg_status_notify() without valid LAC or
 cellid or status
Date: Thu, 07 Sep 2017 22:49:15 +0200
Message-ID: <20170907224900.1cf64d44@lazus.yip>
List-Id: <ofono.ofono.org>
To: ofono@ofono.org

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Hi,

I've noticed when using a Quectel EC20 (qmimodem) sometimes I see a LAC
and a cellid, sometimes I do not.
After looking into it, the problems lies in the ofono plugin api or in
the qmimodem driver. I'm unsure where I should fix this issue.

The problem:

The qmimodem notifies ofono about any change of lac, ci, tech or status.
But the qmimodem will only include those items which have been
changed, not all. But ofono doesn't allow only to update one single
item, only all of them at the same time.
 =

void ofono_netreg_status_notify(struct ofono_netreg *netreg, int status,
                        int lac, int ci, int tech)
If lac or ci is `-1` it seems to mean invalid (TODO: create a define or
enum)

So how to fix this?

a) when something change, do another call to get all values from the
modem

b) extend the ofono api to allow `#define NO_CHANGE -2` for lac ci
tech, status

c) unlikely: buffer the old values in the driver/qmimodem code

d) ??

Regards,
Alexander

-- =

Alexander Couzens

mail: lynxis(a)fe80.eu
jabber: lynxis(a)fe80.eu
mobile: +4915123277221
gpg: 390D CF78 8BF9 AA50 4F8F  F1E2 C29E 9DA6 A0DF 8604

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