→ undefined reference to `mbedtls_entropy_func’ → undefined reference to `mbedtls_entropy_init’ Then I commented MBEDTLS_ENTROPY_C again and defined MBEDTLS_NO_PLATFORM_ENTROPY on config.h. → #error “Platform entropy sources only work on Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h” This is related to entropy_poll.c:55 MBEDTLS_ENTROPY_C was commented, so I defined it again on config.h. I want to ask, what does “bio” stands for? And also another question, what should be the prototype of send/receive callbacks? They are functions to send/receive individual bytes? Or vectors? Or something else?ī) Do you have MBEDTLS_ENTROPY_C defined? Note that in cryptography, randomness is a key feature, as a root of trust, and you will need some entropy to supply a seed for your drbg. Yes, I want to pass the receive and send callbacks to the bio. Ok, so I will leave “mbedtls_net_init” and “mbedtls_net_xxx” functions commented. You don’t need to use the mbedtls_net_xxx API, but you will need to supply the bio callbacks for send and receive to mbedtls_ssl_set_bio() If your platform doesn’t supply this socket API, then you will need to implement your own bio callbacks for your code. net_sockets.c suppolies a BSD like socket module. I would like to receive some orientation to continue from that point.Ī) Since you commented MBEDTLS_NET_C, then you don’t have mbedtls_net_init() built in your project, as you can see here. OBS: My intention is to stablish connection as a TLS/HTTPS client only, no need to act as a webserver. My config.h file was config-mini-tls1_1.h originally. Am I correct? If not, what is the ‘pers’ parameter? I’m imagining I can pass some real random numbers to this function? and the quantity? I have always 12 bytes of random values obtained from RF noise available in a circular buffer. –> ‘pers’ undeclared (first use in this function)

( C ) when I try to compile with line “3” uncommented: Goes to prototype when click on the function. –> undefined reference to `mbedtls_entropy_init’ ( B ) when I try to compile with line “2” uncommented: When I click on the function “mbedtls_net_init” on main, the cursor goes to its prototype on net_sockets.h, and I can see this function is present on net_sockets.c (its a 1 line function). –> undefined reference to `mbedtls_net_init’ ( A ) This is what happen when I try to compile with line “1” (of the picture) uncommented: After compile, the flash memory usage increased around 50KB, and I think this is ok for me.

12kb on nucleo f401re