How to print mbed tls debug messages in MBED ?

[LMESTM]

Question

I'd like to see outputs of MBEDTLS macros like MBEDTLS_SSL_DEBUG_MSG.
Has this been plugged into MBED trace module and if so how do I activate it ?

[LMESTM]

@RonEld @adustm maybe you guys know how to do it ?

[adustm]

Hello Laurent, you can see an example here :
https://github.com/ARMmbed/mbed-os-example-tls/blob/5cca1f74a70855c17cf292f176d0c96db4980df9/tls-client/main.cpp#L48

The debug level is between 0 (nothing) and 4 (every details)

[LMESTM]

Thanks @adustm .
So to summarize in this ticket, in order to debug MBEDTLS in mbed we need the program to:

• include mbedtls/debug.h
• define a debug callback (my_debug in the provided example)
• then register this callabck and activate the desired threshold with mbedtls API:
  mbedtls_ssl_conf_dbg(&_ssl_conf, my_debug, NULL);
  mbedtls_debug_set_threshold(DEBUG_LEVEL);

[moustafabessar]

It doesn't work on matlab mex file
I tried to run the client1.c example on mex file and IT WORKS but debug doesn't work.