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suit/transport/coap: use nanocoap for request

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This changes the retransmission timeout behavior.
In SUIT the timeout was uses as the maximum time *all* retransmissions
could take, whereas in nanocoap the timeout was specified per retransmission.

This means that SUIT now adopts the timeout behavior of nanocoap.
This commit is contained in:
Benjamin Valentin 2022-01-05 22:31:55 +01:00
parent ef07136c86
commit 6f161569f4
1 changed files with 1 additions and 62 deletions
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63
sys/suit/transport/coap.c
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@ -133,67 +133,6 @@ static inline uint32_t deadline_left(uint32_t deadline)
return left;
}
static ssize_t _nanocoap_request(sock_udp_t *sock, coap_pkt_t *pkt, size_t len)
{
ssize_t res = -EAGAIN;
size_t pdu_len = (pkt->payload - (uint8_t *)pkt->hdr) + pkt->payload_len;
uint8_t *buf = (uint8_t *)pkt->hdr;
uint32_t id = coap_get_id(pkt);
/* TODO: timeout random between between ACK_TIMEOUT and (ACK_TIMEOUT *
* ACK_RANDOM_FACTOR) */
uint32_t timeout = CONFIG_COAP_ACK_TIMEOUT * US_PER_SEC;
uint32_t deadline = deadline_from_interval(timeout);
/* add 1 for initial transmit */
unsigned tries_left = CONFIG_COAP_MAX_RETRANSMIT + 1;
while (tries_left) {
if (res == -EAGAIN) {
res = sock_udp_send(sock, buf, pdu_len, NULL);
if (res <= 0) {
DEBUG("nanocoap: error sending coap request, %d\n", (int)res);
break;
}
}
res = sock_udp_recv(sock, buf, len, deadline_left(deadline), NULL);
if (res <= 0) {
if (res == -ETIMEDOUT) {
DEBUG("nanocoap: timeout\n");
tries_left--;
if (!tries_left) {
DEBUG("nanocoap: maximum retries reached\n");
break;
}
else {
timeout *= 2;
deadline = deadline_from_interval(timeout);
res = -EAGAIN;
continue;
}
}
DEBUG("nanocoap: error receiving coap response, %d\n", (int)res);
break;
}
else {
if (coap_parse(pkt, (uint8_t *)buf, res) < 0) {
DEBUG("nanocoap: error parsing packet\n");
res = -EBADMSG;
}
else if (coap_get_id(pkt) != id) {
res = -EBADMSG;
continue;
}
break;
}
}
return res;
}
static int _fetch_block(coap_pkt_t *pkt, uint8_t *buf, sock_udp_t *sock,
const char *path, coap_blksize_t blksize, size_t num)
{
@ -212,7 +151,7 @@ static int _fetch_block(coap_pkt_t *pkt, uint8_t *buf, sock_udp_t *sock,
pkt->payload = pktpos;
pkt->payload_len = 0;
int res = _nanocoap_request(sock, pkt, 64 + (0x1 << (blksize + 4)));
int res = nanocoap_request(sock, pkt, 64 + (0x1 << (blksize + 4)));
if (res < 0) {
return res;
}