Type Alias riot_sys::coap_handler_t
source · pub type coap_handler_t = Option<unsafe extern "C" fn(pkt: *mut coap_pkt_t, buf: *mut u8, len: size_t, context: *mut coap_request_ctx_t) -> ssize_t>;Expand description
@brief Resource handler type
Functions that implement this must be prepared to be called multiple times for the same request, as the server implementations do not perform message deduplication. That optimization is described in the CoAP specification.
This should be trivial for requests of the GET, PUT, DELETE, FETCH and iPATCH methods, as they are defined as idempotent methods in CoAP.
For POST, PATCH and other non-idempotent methods, this is an additional requirement introduced by the contract of this type.
@param[in] pkt The request packet @param[out] buf Buffer for the response @param[in] len Size of the response buffer @param[in] context Request context
@return Number of response bytes written on success Negative error on failure
Aliased Type§
enum coap_handler_t {
None,
Some(unsafe extern "C" fn(_: *mut coap_pkt_t, _: *mut u8, _: u32, _: *mut _coap_request_ctx) -> i32),
}