Re: [lwip-users] lwIP stack with MODBUS TCP/IP on application layer

[Marco Jakobs]

Hi Gabriel,

I'm using MODBUS IP in some projects with LwIP and FreeRTOS. I'm using the netconn API, and it works great. As MODBUS is not using TCP for acknowledgement (in contrast to IEC 60870-104), i would suggest you to also implement the choice of using MODBUS UDP as well. It is not defined in the standard, but more and more devices are supporting it. With TCP you have always a "double acknowledgement" which causes useless traffic, especially on slow connections.

Kind regards
Marco


Am 20.07.2010 15:24, schrieb ORIO, Gabriel:

Hi everybody !

Above all I would like to thank you all for your work. I found it very useful for me. I’m quite new in this field, but I’m getting informed about the things I need.

I would like to know :

 

it is possible tu use the lwIP stack with the MODBUS TCP/IP application protocol ?

 

If it is possible, do I need an API ? (in the MODBUS TCP/IP applications we just need to read and write registers, nothing more)

 

Do I always need an operating system emulation layer when implementing a lwIP ?

 

As I’m not an expert I would like to begin implementing a very simple (but complete) version of the lwIP.

 

I thank you in advance for your kind answers.

 

 

Gabriele ORIO

Axane, Air Liquide

 

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