mbed tls NET和TIMING模块不可用

Question

我已经为具有ARM Mbed OS的K64F板编译mbedtls。我试图运行dtls_client.c和dtls_server.c中的例子。最初，在编译客户端，我得到这个错误：

"The NET and TIMING modules are not available for mbed OS - please use the network and timing functions provided by mbed OS" 

我发现，这是与具有积极在config.h文件这两条线。

#define MBEDTLS_NET_C 
    #define MBEDTLS_TIMING_C 

I commented them and the check that requires the values: 

#if !defined(MBEDTLS_SSL_CLI_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) || \ 
    !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_TIMING_C) ||    \ 
    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) ||  \ 
    !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_RSA_C) ||  \ 
    !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) 
int main(void) 
{ 
    mbedtls_printf("MBEDTLS_SSL_CLI_C and/or MBEDTLS_SSL_PROTO_DTLS and/or " 
      "MBEDTLS_NET_C and/or MBEDTLS_TIMING_C and/or " 
      "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or " 
      "MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_RSA_C and/or " 
      "MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.\n"); 
    return(0); 
} 

现在我看到编译错误我得到的是有关的某些功能的重新定义：

main.cpp:(.text.startup.main+0x18): undefined reference to `mbedtls_net_init' 
main.cpp:(.text.startup.main+0xce): undefined reference to `mbedtls_net_connect' 
main.cpp:(.text.startup.main+0x2fc): undefined reference to `mbedtls_net_recv_timeout' 
main.cpp:(.text.startup.main+0x300): undefined reference to `mbedtls_net_send' 
main.cpp:(.text.startup.main+0x304): undefined reference to `mbedtls_net_recv' 
main.cpp:(.text.startup.main+0x308): undefined reference to `mbedtls_timing_get_delay' 
main.cpp:(.text.startup.main+0x30c): undefined reference to `mbedtls_timing_set_delay' 
main.cpp:(.text.startup.main+0x35c): undefined reference to `mbedtls_net_free' 

我如何定义这个要求，使其工作？

Answer 1

已经回答了这里：https://tls.mbed.org/discussions/platform-specific/compiling-mbeddtls-on-k64f：

Hi Jordi,
dtls_client.c and dtls_server.c are sample applications that arrive as part of the mbed TLS git repository.
Note that mbed-OS arrives with its own mbed TLS feature directory. To test TLS feature, you can use the TLS client app and modify it to fit DTLS protocol, and also for server. You can also look at this example for reference how to configure your dtls client and server.
I hope this helps
mbed TLS Team member
Ron