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sys/net/application_layer/gcoap: fix Observe notifications correlation

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This commit is contained in:
Fabian Hüßler 2024-05-22 16:06:05 +02:00
parent 687a30af33
commit 0614db9cd5
1 changed files with 20 additions and 12 deletions
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32
sys/net/application_layer/gcoap/gcoap.c
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@ -377,6 +377,22 @@ static void _on_sock_udp_evt(sock_udp_t *sock, sock_async_flags_t type, void *ar
}
}
static void _memo_clear_resend_buffer(gcoap_request_memo_t *memo)
{
uint8_t hdr[GCOAP_HEADER_MAXLEN];
if (memo->send_limit >= 0 && memo->msg.data.pdu_buf) {
/* store header from retransmission buffer */
memcpy(hdr, memo->msg.data.pdu_buf, sizeof(hdr));
/* mark referenced retransmission buffer as available again */
*memo->msg.data.pdu_buf = 0;
/* but store the header to keep the token for Observe notifications */
memcpy(memo->msg.hdr_buf, hdr, sizeof(hdr));
/* no further retransmissions should be made and
gcoap_request_memo_get_hdr() has to know how to get the header for Observe notifications */
memo->send_limit = GCOAP_SEND_LIMIT_NON;
}
}
/* Processes and evaluates the coap pdu */
static void _process_coap_pdu(gcoap_socket_t *sock, sock_udp_ep_t *remote, sock_udp_aux_tx_t *aux,
uint8_t *buf, size_t len, bool truncated)
@ -518,9 +534,7 @@ static void _process_coap_pdu(gcoap_socket_t *sock, sock_udp_ep_t *remote, sock_
memo->resp_handler(memo, &pdu, remote);
}
if (memo->send_limit >= 0) { /* if confirmable */
*memo->msg.data.pdu_buf = 0; /* clear resend PDU buffer */
}
_memo_clear_resend_buffer(memo);
/* The memo must be kept if the response is an observe notification.
* Non-2.xx notifications indicate that the associated observe entry
@ -972,9 +986,7 @@ static void _expire_request(gcoap_request_memo_t *memo)
req.hdr = gcoap_request_memo_get_hdr(memo);
memo->resp_handler(memo, &req, NULL);
}
if (memo->send_limit != GCOAP_SEND_LIMIT_NON) {
*memo->msg.data.pdu_buf = 0; /* clear resend buffer */
}
_memo_clear_resend_buffer(memo);
memo->state = GCOAP_MEMO_UNUSED;
}
else {
@ -1357,9 +1369,7 @@ static void _receive_from_cache_cb(void *ctx)
if (_cache_build_response(ce, &pdu, _listen_buf, sizeof(_listen_buf)) >= 0) {
memo->state = (ce->truncated) ? GCOAP_MEMO_RESP_TRUNC : GCOAP_MEMO_RESP;
memo->resp_handler(memo, &pdu, &memo->remote_ep);
if (memo->send_limit >= 0) { /* if confirmable */
*memo->msg.data.pdu_buf = 0; /* clear resend PDU buffer */
}
_memo_clear_resend_buffer(memo);
memo->state = GCOAP_MEMO_UNUSED;
}
}
@ -1765,9 +1775,7 @@ ssize_t gcoap_req_send(const uint8_t *buf, size_t len,
}
if (res <= 0) {
if (memo != NULL) {
if (msg_type == COAP_TYPE_CON) {
*memo->msg.data.pdu_buf = 0; /* clear resend buffer */
}
_memo_clear_resend_buffer(memo);
if (timeout > 0) {
event_timeout_clear(&memo->resp_evt_tmout);
}