wa_mdns.h

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#ifndef RCBENCH_WA_MDNS_H
#define RCBENCH_WA_MDNS_H
 
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define WA_MDNS_PORT   5353u
#define WA_MDNS_TTL    120u
#define WA_MDNS_MAX    512u

size_t wa_mdns_reply(const uint8_t *q, size_t n, uint16_t src_port,
                     const char *host, const uint8_t ip[4], uint8_t *out,
                     size_t cap);

size_t wa_mdns_announce(const char *host, const uint8_t ip[4], uint8_t *out,
                        size_t cap);
 
/*
 * The responder's starts in one join of the home network.  A start that
 * fails -- no task, no socket, no bind, no group membership -- is tried
 * again WA_MDNS_RETRIES times, WA_MDNS_RETRY_MS apart; after that the name
 * stays unanswered until the next join, and the address shown on the panel
 * still works.
 */
#define WA_MDNS_RETRIES   3u
#define WA_MDNS_RETRY_MS  5000u
 
typedef struct {
    uint8_t  starts;     
    uint32_t next_ms;    
} wa_mdns_tries_t;

void wa_mdns_tries_reset(wa_mdns_tries_t *t);

bool wa_mdns_tries_due(const wa_mdns_tries_t *t, uint32_t now_ms);

void wa_mdns_tries_started(wa_mdns_tries_t *t, uint32_t now_ms);
 
#ifdef __cplusplus
}
#endif
 
#endif /* RCBENCH_WA_MDNS_H */