Re: [paho-dev] Embedded MQTT C Client

[Guy Dillen <guy.dillen@xxxxxxxxx>]

Thanks Ian to clarify things.

On 23/09/14 11:59, "Ian Craggs" <icraggs@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

>To be clear, there are a number of options for embedded clients now.
>
>1) use the lowest-level MQTTPacket library, which is used by Benjamin in
>his tutorial videos.  Thanks Benjamin!
>
>2) use the higher level C++ embedded MQTTClient library.  This was
>written first of all for mbed, where C++,  rather than C, is the defacto
>programming language.    This is C++ without STL (char* not String) and
>still without dynamic memory allocation.
>
>This is also working for the Arduino, and is an API that looks fairly
>Arduino-like.  I've created an Arduino library out of this code.
>
>3) Use the C version of 2), in the MQTTClient-C directory.  This was
>written by Al as a C "copy" of the C++ library, for those environments
>which struggle with C++ or for which C is the preferred language.
>
>Options 2) and 3) are more helpful than 1), but use more resources.
>
>The CC3200 environment is not conducive to C++ development, from Al's
>experience, so 1) or 3) are the options to consider.
>
>Ian
>
>
>On 09/22/2014 05:05 PM, Al Stockdill-Mander wrote:
>> The CC3200 code relies on the SimpleLink libraries provided by TI. I'm
>> not familiar with the Spark Core but it looks like it's designed to be
>> similar to the arduino in terms of IDE and libraries. It will almost
>> certainly be easier to port the arduino embedded C++ library. If you
>> look in the repo at the moment under arduino there is EthernetStack.h
>> and WifiIPStack.h, these provide the implementation specifics for the
>> Ethernet or WifiShield on an arduino.
>> Looking at the Spark site there seem to be most of the equivalent
>> functions (.connect() .available() .write()) under TCPClient, although
>> it doesn't seem to have a readBytes() so you'd have to use a loop to
>> read() a byte at a time into the buffer.
>> The current Countdown.h in the arduino directory should work as is as
>> it only uses millis() which also seems to be on the spark core.
>>
>> Al
>>
>> On 22/09/14 16:44, Guy Dillen wrote:
>>> Hi Al,
>>>
>>> Thanks.
>>> Besides the TI CC3200 I also would like porting/using the library
>>> with my Spark Core's (www.spark.io) based on that are based on the
>>> ARM cortex M3 microprocessor. I suppose, since I'm no expert C
>>> developer, can I use the same source code as for the CC3200? Any
>>> help/suggestions welcome.
>>>
>>> Thanks.
>>> Guy
>>>
>>> Sent from my iPad
>>>
>>>> On 22 Sep 2014, at 17:13, Al Stockdill-Mander <asm@xxxxxxxx> wrote:
>>>>
>>>> Guy,
>>>>
>>>> Copy the MQTTClient.c/h and MQTTCC3200.c/h files to wherever is
>>>> suitable for the app you're working on. You only need to import the
>>>> MQTTClient.h, but you have to edit MQTTClient.h to #include the
>>>> platform specific implementation it is to use. Currently there is
>>>> only the CC3200 code, so add a #import "MQTTCC3200.h" to the end of
>>>> the #includes in MQTTClient.h
>>>> I realise that there is a distinct lack of documentation/samples for
>>>> the C specific embedded client, I'll try and get something up asap.
>>>> In the mean time please ask any other questions here and I'll do
>>>> what I can to help.
>>>>
>>>> Al
>>>>
>>>>> On 22/09/14 14:56, Guy Dillen wrote:
>>>>> Hi,
>>>>>
>>>>> I mentioned the embedded C implementation has a specific C (and even
>>>>> more specific) CC3200 implementation.
>>>>> I¹m confused as what sources to use; in the example form Benjamin
>>>>>Cabé
>>>>> all source code under MQTTPacket was imported in the CC3200
>>>>> microcontroller project. Should I still import these sources or
>>>>> only the
>>>>> sources under
>>>>> org.eclipse.paho.mqtt.embedded-c-master -> MQTTClient-C -> cc3200 ->
>>>>> MQTTCC3200.c and MQTTCC3200.h?
>>>>>
>>>>> Thanks.
>>>>> Guy
>>>>>
>>>>>
>>>>>
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>-- 
>Ian Craggs
>icraggs@xxxxxxxxxx                 IBM United Kingdom
>Committer on Paho, Mosquitto
>
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