Re: [paho-dev] [Help]Sizing architecture

[jerome <jerome@xxxxxxxxxxxxx>]

Hi all,
thanks again for the answer (useful) Ian.
Just for your information , you may be interested in Polar SSL , very 
small footprint & now subproject from MBED so don't come with the 
tedious licenses problems as CyanSSL used in your blog entry.

Kind regards
jerome

On 07/21/2015 12:13 PM, Ian Craggs wrote:
> Hi Jerome,
>
> the embedded client libraries come in several flavours, with differing 
> memory footprints and amounts of function.  You can pick or customize 
> the library that you need based ion your particular requirements.  I 
> don't have exact footprint figures, partly because of the amount of 
> options you have available.
>
> I take it that you've read 
> https://www.eclipse.org/paho/clients/c/embedded/ ?
>
> MQTTPacket - the lowest library level, written in C, with the smallest 
> footprint.  You can include just the MQTT functions that you need.  
> Helper functions for networking are included, but may well need 
> tailoring.
>
> MQTTClient - intermediate level library, C++.  Written first for 
> mbed.  Networking and OS functions are pluggable, with samples for 
> mbed and Linux.
>
> MQTTClient-C - C version of MQTTClient.  Written first for the TI 
> CC3200.  Networking and OS functions are pluggable with samples for TI 
> CC3200 and FreeRTOS.
>
> If you are happy to use about 10k for the MQTT code, then MQTTClient 
> and MQTTClient-C might be appropriate.  If you want to minimize the 
> footprint then you probably want to use MQTTPacket.
>
> I've not used NuttX.
>
> These libraries are not tied to any particular OS or network library, 
> but do have samples and examples for a number of environments.  I 
> described an example of using a TLS library on mbed here:  
> http://modelbasedtesting.co.uk/?p=181.  We haven't included any code 
> to use a TLS library in Paho so far because of licensing restrictions 
> (many TLS libraries are GPL, not LGPL).
>
> Ian
>
> On 07/21/2015 10:25 AM, jerome wrote:
> > Hi all,
> > sorry for any inconveniance but I expect you to help me to choose the 
> > right MCU for my needs....
> > Tiny MCUs like Cortex M0+ may come with up to 32kB RAM and 256kb 
> > FLASH and I would like to know :
> > - memory footprint for the Eclipse Paho embedded client
> > - footprint on FLASH once compiled for such ARM chips (without debug 
> > information)
> > - library dependencies if I want to activate the AES encyrption 
> > support (I would like to send all messages from client to back-end 
> > using AES encryption),
> >
> > I need to choose the RTOS and I still have some work to do before 
> > choosing between:
> > + FreeRTOS
> > + MBed 3(ARM)
> > + NuttX
> > Do you have any success with these RTOS ?
> > Every input will be useful....
> >
> > Kind regards
> > Jerome
> >
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