This message was posted on behalf of Intel Corporation
Thank you for contacting us and letting us know you found the solution to your fiest question. In regards to your second question, I looked at the mcu_snprintf function on the document you posted and at the mcu_api.h file. It appears that both documents say different things, as you pointed out. In https://software.intel.com/en-us/node/557355 , mcu_snprintf is declared as a void and in mcu_api.h, it is declared as an int, as you can see here:
Let us know if there’s anything else we can assist you with.