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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Simple Components 4.12 with MQTT implementation released
Date: Fri, 15 Apr 2016 18:39:22 +0200
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Date: 2016-04-15T18:39:22+02:00
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On 2016-04-15 18:00, slos wrote:
> Le vendredi 15 avril 2016 17:34:36 UTC+2, Dmitry A. Kazakov a écrit :

>> You can sit and wait for something reasonable to come, or you can start
>> using things you consider right. I prefer the latter.
> And reinvent the wheel ?
>
> If you want drives, encoders, IO modules, etc... you have them all
> using those standard field buses. Would you create your own ?

No, I would dock them to the middleware using whatever protocol they 
run. That is one of the key advantages of a proper middleware over OPC, 
i.e. an abstraction of the hardware.

With OPC/MQTT approach you must wait until the vendor of the encoder 
will write an OPC/MQTT server for you. He might do it or decide in favor 
of something else ModBus, ProfiNET, CAN etc. Vendors have limited 
resources and even more limited software development competence to 
expect them to offer the exactly "standard" you consider standard.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de