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Re: [paho-dev] MQTT Objective-C Client

Hi Ian,

Thanks for the information.

Do you a link about the issue with Apple distribution agreements?
My objc lib is shipping with Xcode project settings and I'd like to
ensure that there is no issue with that.
My company, Red Hat, contributes to some Open Source Objc libraries
and they ship with these files out of the box (e.g.


On Wed, Feb 19, 2014 at 5:48 PM, Ian Craggs
<icraggs@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Jeff,
> when the Paho MQTT C client was being written at IBM, we were planning to
> write an Objective C layer for it.  But we had the same problem as this
> contribution is facing: the Apple distribution agreements.  At the time, our
> advice was that we could not proceed, as no way could be found to distribute
> such code.
> So, we tested the Paho C client on MacOS and iOS and wrote some build
> instructions, but that is all we could do.
> At this point, I think the limitations for any MQTT Objective-C layer, or
> client are likely to be legal rather than technical.
> Ian
> On 14/02/14 18:59, Jeff Mesnil wrote:
>> Hi,
>> I'm interested by the Objective-C client[1] that andy committed recently.
>> I've browsed this mailing list archive before subscribing but I did
>> not find a lot of information on it.
>> At first glance, this looks to be a whole implementation of a MQTT
>> client. Is there any reason why it could not leverage the mqtt.c[2]
>> code instead?
>> Given the easy bridge between C and Objective-C, I was wondering if
>> you thought about wrapping the low-level C in a Objective-C library
>> wrapper? (I did not look in details to the mqtt.c code but I assume
>> it's in good shape).
>> Looking at it, it runs on a NSRunLoop and a delegate.
>> Is it planned to "modernize" the API and leverage GCD and Blocks instead?
>> I tend to prefer API using blocks instead of delegates especially for
>> event-driven code that is likely to be written to handle MQTT messages
>> (as an example, I also wrote a ObjC library for STOMP using GCD and
>> blocks[4])
>> One reason I could think of rewriting the whole client in Objective-C
>> would be persist the message for QoS 1 and 2 but I have not found such
>> code in the current objc client. Is it something planned?
>> To give some context, I am writing a book on messaging protocols for
>> mobile devices and Web browsers and I have several chapters on MQTT.
>> When I started writing the chapter about MQTT on iOS, I could not find
>> a good Objective-C client, so I wrote one[5] :) It's wrapping the
>> libmosquitto C library and is far from complete (I'm not a MQTT
>> expert) but it's working for simple applications[6].
>> The book is scheduled for this summer. Andy, do you know if there is a
>> roadmap for the objc client?
>> If there is a good Objective-C client in Paho, I would have no problem
>> to rewrite the iOS chapter with it as long as the lib fits in my book
>> schedule.
>> If I have a lot more remarks on the current objc code but I just
>> wanted some more context information on the direction of this library
>> in order to provide some feedback and code contribution.
>> cheers,
>> jeff
>> [1]
>> [2]
>> [3]
>> [4]
>> [5]
>> [6]
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Jeff Mesnil

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