127 lines
5.1 KiB
C
127 lines
5.1 KiB
C
/*
|
|
* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Example resource
|
|
* \author
|
|
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include "rest-engine.h"
|
|
#include "er-coap-separate.h"
|
|
#include "er-coap-transactions.h"
|
|
|
|
static void res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
|
|
static void res_resume_handler(void);
|
|
|
|
SEPARATE_RESOURCE(res_separate1,
|
|
"title=\"Separate demo\"",
|
|
res_get_handler,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
res_resume_handler);
|
|
|
|
/* A structure to store the information required for the separate handler */
|
|
typedef struct application_separate_store {
|
|
|
|
/* Provided by Erbium to store generic request information such as remote address and token. */
|
|
coap_separate_t request_metadata;
|
|
|
|
/* Add fields for addition information to be stored for finalizing, e.g.: */
|
|
char buffer[16];
|
|
} application_separate_store_t;
|
|
|
|
#define COAP_MAX_OPEN_SEPARATE 2
|
|
|
|
static uint8_t separate_active = 0;
|
|
static application_separate_store_t separate_store[COAP_MAX_OPEN_SEPARATE];
|
|
|
|
static void
|
|
res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
|
|
{
|
|
/*
|
|
* Example allows only one open separate response.
|
|
* For multiple, the application must manage the list of stores.
|
|
*/
|
|
if(separate_active >= COAP_MAX_OPEN_SEPARATE) {
|
|
coap_separate_reject();
|
|
} else {
|
|
++separate_active;
|
|
|
|
/* Take over and skip response by engine. */
|
|
coap_separate_accept(request, &separate_store->request_metadata);
|
|
/* Be aware to respect the Block2 option, which is also stored in the coap_separate_t. */
|
|
|
|
/*
|
|
* At the moment, only the minimal information is stored in the store (client address, port, token, MID, type, and Block2).
|
|
* Extend the store, if the application requires additional information from this handler.
|
|
* buffer is an example field for custom information.
|
|
*/
|
|
snprintf(separate_store->buffer, sizeof(separate_store->buffer), "StoredInfo");
|
|
}
|
|
}
|
|
static void
|
|
res_resume_handler()
|
|
{
|
|
if(separate_active) {
|
|
coap_transaction_t *transaction = NULL;
|
|
if((transaction = coap_new_transaction(separate_store->request_metadata.mid, &separate_store->request_metadata.addr, separate_store->request_metadata.port))) {
|
|
coap_packet_t response[1]; /* This way the packet can be treated as pointer as usual. */
|
|
|
|
/* Restore the request information for the response. */
|
|
coap_separate_resume(response, &separate_store->request_metadata, REST.status.OK);
|
|
|
|
coap_set_payload(response, separate_store->buffer, strlen(separate_store->buffer));
|
|
|
|
/*
|
|
* Be aware to respect the Block2 option, which is also stored in the coap_separate_t.
|
|
* As it is a critical option, this example resource pretends to handle it for compliance.
|
|
*/
|
|
coap_set_header_block2(response, separate_store->request_metadata.block2_num, 0, separate_store->request_metadata.block2_size);
|
|
|
|
/* Warning: No check for serialization error. */
|
|
transaction->packet_len = coap_serialize_message(response, transaction->packet);
|
|
coap_send_transaction(transaction);
|
|
/* The engine will clear the transaction (right after send for NON, after acked for CON). */
|
|
|
|
/* FIXME there could me more! */
|
|
separate_active = 0;
|
|
} else {
|
|
/*
|
|
* Set timer for retry, send error message, ...
|
|
* The example simply waits for another button press.
|
|
*/
|
|
}
|
|
} /* if (separate_active) */
|
|
}
|