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Re: [wakaama-dev] feedback on read object API
if the 16 bits are significant maybe we can use a 32-bit integer ? or we can use a pointer to a 16 bit integer. (if the pointer is NULL we want all data else we want the resource given by "pointed" resourceid) 

Le 25/08/2014 16:23, Navarro, David a écrit :

Hi Simon,

I can understand this can be confusing. Thing is I could not come up with better solution without defining more APIs. I'm open to any idea here. But the read callback could be used to read one ressource, all ressources or some ressources.
Using resourceId == -1 can not work as ressourceId is a 16-bit integer and 65535 (-1) is a valid ressource ID. Yes if LWM2M had a reserved value for IDs, it would simplify implementation but I failed to convince other OMA members of this...

Regards,
David Navarro

-----Original Message-----
From: wakaama-dev-bounces@xxxxxxxxxxx [mailto:wakaama-dev-bounces@xxxxxxxxxxx] On Behalf Of Simon Bernard
Sent: Friday, 1 August, 2014 17:57
To: wakaama-dev@xxxxxxxxxxx
Subject: [wakaama-dev] feedback on read object API

I recently updated my code (https://github.com/sbernard31/lualwm2m) to be compliant with the new object API. (with lwm2m_tlv_t struct)

I found the read API a bit confusing because output parameters are also use as input parameters.

static uint8_t prv_read(uint16_t instanceId, int * numDataP,
          lwm2m_tlv_t ** dataArrayP, lwm2m_object_t * objectP)

Currently, numDataP and dataArrayP are output parameters but must be used as input to know how to fill it.

if (*numDataP) == 0  we want all the data else we want just one data with the id (dataArrayP)->id

Maybe this could be clearer to add an input parameter resourceId.

if resourceId == -1 we want all data
else we want the resource with the given resourceId

Simon
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