Re: [lwip-users] Request for ALTCP example etc.

[Richard Man]

Hello pardon me for asking newbie question.

With the requisite call

mqtt_client_info.tls_config = altcp_tls_create_config_client(cert, sizeof(cert));

 

Let's say I am using an embedded system with no file system support. I am communicating with a server only and will not be acting as a server for other clients. TLS is used for MQTT data encryption. 

Is it correct that in this scenario I can use a self-signing certificate? I used Java Keytool to create a .cer file. Is it the case that I can convert the .cer file into a C array, and then use it in the call above?

Thanks for any help.

On Fri, Aug 3, 2018 at 12:48 AM, address@hidden <address@hidden> wrote:

On 03.08.2018 09:36, Richard Man wrote:

Hi Simon or others, I am attempting to build 2.1.0 RC1 with ALTCP, specifically with the mbedTLS 2.12.0. Looks like I need to map the function pointers in altcp_tcp.h to the mbedTLS functions, but if there is a working example that I can leverage, I would appreciate it. There is some urgency in this (but why of course).

The altcp functions are mapped to mbedTLS in the files under "src\apps\altcp_tls\". You just need to enable them and link them in.

mqtt initialization works much like normal, but you have to assign a "tls_config" in struct mqtt_connect_client_info_t:
mqtt_client_info.tls_config = altcp_tls_create_config_client(cert, sizeof(cert));

where "cert" is a certificate readable by "mbedtls_x509_crt_parse()" (e.g. x509).

Simon

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// richard http://imagecraft.com
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