|Re: [paho-dev] MQTT Objective-C Client|
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 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 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) 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 :) 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. 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  http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.objc.git/  http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.c.git/  http://mobile-web-messaging.net  https://github.com/mobile-web-messaging/StompKit/blob/master/README.md  https://github.com/jmesnil/MQTTKit  https://github.com/jmesnil/MQTTExample
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