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Re: [lwip-users] Building mbedtls using LWIP library

From: Noam Weissman
Subject: Re: [lwip-users] Building mbedtls using LWIP library
Date: Tue, 18 Apr 2017 10:53:23 +0000

Hi Shruthi,

As a continuation to Jan mail...

I am using mbedTLS 2.42 + LwIP 2.02 and it works for me... after some 
straggling :-)

I strongly suggest upgrading to LwIP 1.42 as a minimum. As far as I know there 
many fixes from 1.40 to 1.42

mbetTLS has a net_socket.c+h file that is the "porting" file

I am working with ST micro and they have added a porting file named retarget.c 
... without it, it will not
work as the mbedTLS uses printf and standard IO.

What micro are you using ?, are you using Linux or another OS. You may need to 
add some files that are 
not part of the mbedTLS library ?


-----Original Message-----
From: lwip-users [mailto:address@hidden On Behalf Of Jan Menzel
Sent: Tuesday, April 18, 2017 12:31 PM
To: address@hidden
Subject: Re: [lwip-users] Building mbedtls using LWIP library

Hi Shruthi!
        I'm using mbedtls and lwip on an embedded devices so I can only help 
integration both if there are no other tcp/ip-stacks around.
        Basically mbedtls interfaces to any tcp/ip-stack using bsd-socket API.
This is archived using the file net.c, which comes with mbedtls such, that it 
builds on multiple platforms. I'd suggest that you carefully check that all 
calls to open/close/read/write are correctly linked to lwip. There might be 
modifications needed - eventually also in lwip - to not use the Linux stack. I 
think that should be all. Please make sure to enable socked api. You might need 
to enable support for transmit/receive timeouts and you might wont to make 
sure, that lwips errno can be/is read insight net.c.
        Please check the archive of this list as we had recently some 
discussions regarding mbedtls and the configuration of lwip.

        Best regards

On 18.04.2017 11:02, shruthi wrote:
> Hi,
> I am using the LWIP stack(1.4.0 version) as a *tap device (tap0)* on 
> my Linux system. I have a simple TCP server-client application running 
> on the LWIP stack. Now I want to add TLS over TCP, and I found that 
> mbedTLS is one of the recommended libraries to add TLS support on 
> LWIP. Could you please tell me how to integrate the two?
> I want to make the mbedTLS library use the LWIP library APIs instead 
> of the Linux APIs. I am new to both these libraries and I am not sure 
> what changes to make in the Makefiles to build them together. Any 
> advice/suggestions would be appreciated.
> Regards,
> Shruthi
> --
> View this message in context: 
> http://lwip.100.n7.nabble.com/Building-mbedtls-using-LWIP-library-tp29
> 319.html Sent from the lwip-users mailing list archive at Nabble.com.
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> lwip-users mailing list
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