const char *issuer_host_name,
const char *mailbox, int peer_id);
/**
* Builds a new "have/piece" message
*/
const char *issuer_host_name,
const char *mailbox, int peer_id);
/**
* Builds a new "have/piece" message
*/
const char *issuer_host_name,
const char *mailbox, int peer_id,
int index);
const char *issuer_host_name,
const char *mailbox, int peer_id,
int index);