Function otCoapOptionIteratorInit 

pub unsafe extern "C" fn otCoapOptionIteratorInit(
    aIterator: *mut otCoapOptionIterator,
    aMessage: *const otMessage,
) -> otError

Initializes an iterator for the options in the given message.

@param[in,out] aIterator A pointer to the CoAP message option iterator. @param[in] aMessage A pointer to the CoAP message.

@retval OT_ERROR_NONE Successfully initialized. @retval OT_ERROR_PARSE Message state is inconsistent.