RE: Failing to build latest OpenThread library

Marco Russi — Wed, 10 May 2017 13:11:13 GMT

Thank you very much for your detailed answer. I'm out of office at the moment for a few days but I'll try your suggested solution asap and I'll let you know. Thank you.

RE: Failing to build latest OpenThread library

Lukasz Duda — Mon, 08 May 2017 08:25:46 GMT

Hello Marco!

Thanks for raising this issue!

As you probably guess, there were quite a lot of changes in OpenThread repository since our last release. Based on your output i see two problems:

libopenthread-cli.a - OpenThread has deprecated a usage of this library, and instead introduced two new ones:
- libopenthread-cli-ftd.a (for Full Thread Device)
- libopenthread-cli-mtd.a (for Minimal Thread Device)
And since you probably only replaced all old libraries, you still try to link examples with old version of libopenthread-cli.

To fix that, you need to correct the name of the library in the proper Makefile of the example. E.g. $(SDK_ROOT)/external/openthread/lib/gcc/libopenthread-cli.a to $(SDK_ROOT)/external/openthread/lib/gcc/libopenthread-cli-ftd.a
The second problem that you have expirienced hardware_entropy.c:37: undefined reference to "otPlatRandomSecureGet" is caused by the new API introduced here and to fix it, you have two ways:
- use libmbedcrypto.a library from the OpenThread repository (without hardware acceleration)
- recompile libmbedcrypto.a with a hardware acceleration as it is explained here. Note that you need to align API with the new OpenThread in components/thread/experimental/crypto/hardware_entropy.c file.

In the mbedtls_hardware_poll function you should replace the usage of otPlatRandomSecureGet with otPlatRandomGetTrue with appropriate function parameters.

e.g. (not tested)

int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen)
{
    ThreadError error;

    (void)data;

    error = otPlatRandomGetTrue((uint8_t *)output, len);

    if (error == kThreadError_None)
    {
        *olen = len;
    }
    else
    {
        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
    }

    return 0;
}