Hi Alexander,
On 09/07/2017 03:49 PM, Alexander Couzens wrote:
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
That sounds expensive, why do you want to incur extra round-trips?
b) extend the ofono api to allow `#define NO_CHANGE -2` for lac ci
tech, status
Eww, please don't ;) FYI, we long time ago decided to base the driver
API on what is mandated by 27.007. In the case where things are skipped
by 27.007 we improvise. However, in this case all the parameters are
updated via +CREG, so I don't really want to introduce new semantics.
The driver has to handle this.
c) unlikely: buffer the old values in the driver/qmimodem code
This sounds best so far. What don't you like about this approach?
Regards,
-Denis
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