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When trying to generate a random integer I get following error:

c:/td/td_rf_module_sdk-v4.0.0/gnu/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/lib/thumb2\libcs3unhosted.a(unhosted-sbrk.o): In function `_sbrk':
sbrk.c:(.text+0x3c): undefined reference to `__cs3_heap_limit'

I have included stdlib.h and am calling the rand() function like I would do in any C program.
Any suggestions?

Kind regards.

This basically means your binary requires more RAM than available on board. Keep in mind we only have 16Kb of RAM and that using standard librairies usually links a lot of things... A good random number is RTC->CNT for example but you can also use ADC inputs to read some noise.