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examples/nanocoap: add blockwise handler example

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This commit is contained in:
Kaspar Schleiser 2018-03-06 18:00:27 +01:00
parent 4897222e7e
commit b42159df21
2 changed files with 53 additions and 0 deletions
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3
examples/nanocoap_server/Makefile
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@ -27,6 +27,9 @@ USEMODULE += nanocoap_sock
# include this for nicely formatting the returned internal value
USEMODULE += fmt
# include sha256 (used by example blockwise handler)
USEMODULE += hashes
# include this for printing IP addresses
USEMODULE += shell_commands

50
examples/nanocoap_server/coap_handler.c
View File

@ -12,6 +12,7 @@
#include "fmt.h"
#include "net/nanocoap.h"
#include "hashes/sha256.h"
/* internal value that can be read/written via CoAP */
static uint8_t internal_value = 0;
@ -55,9 +56,58 @@ static ssize_t _riot_value_handler(coap_pkt_t *pkt, uint8_t *buf, size_t len, vo
COAP_FORMAT_TEXT, (uint8_t*)rsp, p);
}
ssize_t _sha256_handler(coap_pkt_t* pkt, uint8_t *buf, size_t len, void *context)
{
(void)context;
/* using a shared sha256 context *will* break if two requests are handled
* at the same time. doing it anyways, as this is meant to showcase block1
* support, not proper synchronisation. */
static sha256_context_t sha256;
uint8_t digest[SHA256_DIGEST_LENGTH];
uint32_t result = COAP_CODE_204;
coap_block1_t block1;
int blockwise = coap_get_block1(pkt, &block1);
printf("_sha256_handler(): received data: offset=%u len=%u blockwise=%i more=%i\n", \
(unsigned)block1.offset, pkt->payload_len, blockwise, block1.more);
if (block1.offset == 0) {
puts("_sha256_handler(): init");
sha256_init(&sha256);
}
sha256_update(&sha256, pkt->payload, pkt->payload_len);
if (block1.more == 1) {
result = COAP_CODE_231;
}
size_t result_len = 0;
if (!blockwise || !block1.more) {
puts("_sha256_handler(): finish");
sha256_final(&sha256, digest);
result_len = SHA256_DIGEST_LENGTH * 2;
}
ssize_t reply_len = coap_build_reply(pkt, result, buf, len, 0);
uint8_t *pkt_pos = (uint8_t*)pkt->hdr + reply_len;
pkt_pos += coap_put_block1_ok(pkt_pos, &block1, 0);
if (result_len) {
*pkt_pos++ = 0xFF;
pkt_pos += fmt_bytes_hex((char *)pkt_pos, digest, sizeof(digest));
}
return pkt_pos - (uint8_t*)pkt->hdr;
}
/* must be sorted by path (alphabetically) */
const coap_resource_t coap_resources[] = {
COAP_WELL_KNOWN_CORE_DEFAULT_HANDLER,
{ "/sha256", COAP_POST, _sha256_handler, NULL },
{ "/riot/board", COAP_GET, _riot_board_handler, NULL },
{ "/riot/value", COAP_GET | COAP_PUT | COAP_POST, _riot_value_handler, NULL },
};