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Re: [paho-dev] Embedded MQTT C Client
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Guy
yes.
But if you want to optimize memory use, and your linker doesn't omit
unused functions from the built binary, then you will want to omit files
you don't need from MQTTPacket - like MQTTUnsubscribeServer.c,
MQTTSubscribeServer.c and MQTTConnectServer.c, which would only be used
by servers.
Ian
On 09/23/2014 02:34 PM, Guy Dillen wrote:
Ian,
MQTTClient and MQTTClient-C are built on top of, and use MQTTPacket.
That still means, even using options the 2 or 3, the sources under the
MQTTPacket branch still need to be imported?
Thanks.
Guy
On 23/09/14 14:27, "Ian Craggs" <icraggs@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
One last thing to mention is that MQTTClient and MQTTClient-C are built
on top of, and use MQTTPacket.
Ian
On 09/23/2014 11:43 AM, Guy Dillen wrote:
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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Committer on Paho, Mosquitto
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Paho Project Lead; Committer on Mosquitto
