Re: [paho-dev] MQTT-SN and MQTT embedded C client updates

[Roger Light <roger@xxxxxxxxxx>]

Hi Ian,

My view is that at the point the user (developer) provides it, the
payload is anonymous bytes of a particular length. We can then treat
is at as an array of chars. Easy for us and doesn't force unnecessary
casting on the developer.

Cheers,

Roger

On Mon, Aug 4, 2014 at 12:01 PM, Ian Craggs
<icraggs@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Hi Roger,
>
> I used unsigned char* rather than void* for the payload/buffers as I thought
> of them as byte arrays or similar, and to aid pointer arithmetic.  I'll
> consider that one.
>
>
> Ian
>
> On 08/02/2014 08:05 PM, Roger Light wrote:
>>
>> Hi Ian,
>>
>>> Packet ids have been changed to "unsigned short", and data buffers to
>>> "unsigned char".  Now the data types are also consistent between the MQTT
>>> and MQTT-SN libraries, which was another motivation.
>>>
>>> I'm not expecting any further data type changes unless a good reason
>>> appears.  I started using size_t for buffer sizes, but have stuck with
>>> ints
>>> to reduce dependencies on any headers - just in case some esoteric/old
>>> embedded compiler didn't like size_t.
>>
>> I'm inclined to agree with Frank - do it "properly" (use size_t) and
>> then fix the odd case where size_t isn't defined if it crops up.
>>
>> I'm also of the opinion that "void *" is a better data type for the
>> data buffers - less hassle for the end developer - but that's probably
>> less important.
>>
>> Cheers,
>>
>> Roger
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>
> --
> Ian Craggs
> icraggs@xxxxxxxxxx                 IBM United Kingdom
> Committer on Paho, Mosquitto
>
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