[−][src]Function openthread_sys::otCoapMessageAppendObserveOption
pub unsafe extern "C" fn otCoapMessageAppendObserveOption(
aMessage: *mut otMessage,
aObserve: u32
) -> otError
This function appends an Observe option.
@param[inout] aMessage A pointer to the CoAP message. @param[in] aObserve Observe field value.
@retval OT_ERROR_NONE Successfully appended the option. @retval OT_ERROR_INVALID_ARGS The option type is not equal or greater than the last option type. @retval OT_ERROR_NO_BUFS The option length exceeds the buffer size.