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