Re: [wakaama-dev] lwm2m watcher list

[Frank Gerlach <Frank_Gerlach@xxxxxxxx>]

Good Morning Rajesh,
the structure you cite is "being pointed at" by another structure, which has the URI:


typedef struct _lwm2m_observed_
{
    struct _lwm2m_observed_ * next;

    lwm2m_uri_t uri;
    lwm2m_watcher_t * watcherList;
} lwm2m_observed_t;

Also have a look at all functions operating on the data structures you want to understand. E.g.

prv_findObserved()

prv_findWatcher()

In general, it takes some time to get accustomed to liblwm2m internals...

Maybe you better ask the list what your "high level objectives" are. Maybe there is a better solution to your goals than looking at the internals in the way you currently do :-)

Kind regards

Frank Gerlach


If you want to understand the data structures I suggest you draw up a diagram by pencil or using some sort of visualization tool.

Also, have a look at the 

Message: 4
Date: Tue, 10 May 2016 17:12:15 +0530
From: "RAJESH KUMAR S.R" <rajuuu1992@xxxxxxxxx>
To: wakaama-dev@xxxxxxxxxxx
Subject: [wakaama-dev] lwm2m watcher list
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	<CAC-BHbV-sHuMBoENu3Y0Dfmsn4+XZWRrRCbURqkEVzg4_1LJag@xxxxxxxxxxxxxx>
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Hi,

I need a small clarification in wakaama code.

LWM2M observed resources are maintained by lwm2m_watcher_t structure.


typedef struct _lwm2m_watcher_
{
    struct _lwm2m_watcher_ * next;

    bool active;
    bool update;
    lwm2m_server_t * server;
    lwm2m_attributes_t * parameters;
    uint8_t token[8];
    size_t tokenLen;
    time_t lastTime;
    uint32_t counter;
    uint16_t lastMid;
    union
    {
        int64_t asInteger;
        double  asFloat;
    } lastValue;
} lwm2m_watcher_t;

There is no member denoting the URI of resource which is to be observed.
And also, can you help me understand why "parameters" member used for.
Is it like a rule engine. For eg:  if the value is "greaterThan" a threshold, notify the server.

Thanks,
Rajesh kumar S R
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