Re: [paho-dev] MQTT C client on MCU

[Ian Craggs <icraggs@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi Jerome,

the Arduino "client" is a packaging of the Embedded C++ client here:

http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.embedded-c.git/tree/MQTTClient/src

This client uses two classes which must have a platform specific implementation for it to work.  This allows it to be independent of operating system.  The classes are:

1) a timer
2) a network interface

Examples for both of these for Linux are here: http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.embedded-c.git/tree/MQTTClient/src/linux/linux.cpp

Some more information is here: http://modelbasedtesting.co.uk/?p=131

For Nuttx you might be able to use the Linux interface classes.  For those platforms that really can't use C++, there is a C version of the same code here:  http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.embedded-c.git/tree/MQTTClient-C.  I think the C++ version is easier to use, just because it's C++.

I'm also interested in contributions from any porting anyone has done.  Having ports for lots of operating systems in Paho would be great.

Ian

On 10/23/2014 10:55 PM, jerome moliere wrote:

Hi all,

I am very interested in the MQTT Arduino C client ,

I'd like to use it in a very close context , on a Cortex M3 MCU on NuttX.

Do you know if someone succeeded in such compilation ?

I've seen while grepping the code that there's a dependency with the Arduino standard header . Is it a huge work to switch to plain POSIX calls ?

The C++ code should be easy to migrate to standard plain C...

Thanks for any pointer or clue ...

Kind regards

Jerome

--
J.MOLIERE - Mentor/J

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Ian Craggs                          
icraggs@xxxxxxxxxx                 IBM United Kingdom
Paho Project Lead; Committer on Mosquitto