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nes-proj/examples/er-rest-example/er-example-server.c

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/*
* Copyright (c) 2013, Matthias Kovatsch
* 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
* Erbium (Er) REST Engine example (with CoAP-specific code)
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "contiki.h"
#include "contiki-net.h"
/* Define which resources to include to meet memory constraints. */
#define REST_RES_HELLO 0
#define REST_RES_CHUNKS 1
#define REST_RES_SEPARATE 1
#define REST_RES_PUSHING 1
#define REST_RES_EVENT 1
#define REST_RES_SUB 1
#define REST_RES_LEDS 0
#define REST_RES_TOGGLE 1
#define REST_RES_LIGHT 0
#define REST_RES_BATTERY 0
#define REST_RES_RADIO 0
#define REST_RES_MIRROR 0 /* causes largest code size */
#include "erbium.h"
#if defined (PLATFORM_HAS_BUTTON)
#include "dev/button-sensor.h"
#endif
#if defined (PLATFORM_HAS_LEDS)
#include "dev/leds.h"
#endif
#if defined (PLATFORM_HAS_LIGHT)
#include "dev/light-sensor.h"
#endif
#if defined (PLATFORM_HAS_BATTERY)
#include "dev/battery-sensor.h"
#endif
#if defined (PLATFORM_HAS_SHT11)
#include "dev/sht11-sensor.h"
#endif
#if defined (PLATFORM_HAS_RADIO)
#include "dev/radio-sensor.h"
#endif
/* For CoAP-specific example: not required for normal RESTful Web service. */
#if WITH_COAP == 3
#include "er-coap-03.h"
#elif WITH_COAP == 7
#include "er-coap-07.h"
#elif WITH_COAP == 12
#include "er-coap-12.h"
#elif WITH_COAP == 13
#include "er-coap-13.h"
#else
#warning "Erbium example without CoAP-specifc functionality"
#endif /* CoAP-specific example */
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
#define PRINTLLADDR(lladdr) PRINTF("[%02x:%02x:%02x:%02x:%02x:%02x]",(lladdr)->addr[0], (lladdr)->addr[1], (lladdr)->addr[2], (lladdr)->addr[3],(lladdr)->addr[4], (lladdr)->addr[5])
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#define PRINTLLADDR(addr)
#endif
/******************************************************************************/
#if REST_RES_HELLO
/*
* Resources are defined by the RESOURCE macro.
* Signature: resource name, the RESTful methods it handles, and its URI path (omitting the leading slash).
*/
RESOURCE(helloworld, METHOD_GET, "hello", "title=\"Hello world: ?len=0..\";rt=\"Text\"");
/*
* A handler function named [resource name]_handler must be implemented for each RESOURCE.
* A buffer for the response payload is provided through the buffer pointer. Simple resources can ignore
* preferred_size and offset, but must respect the REST_MAX_CHUNK_SIZE limit for the buffer.
* If a smaller block size is requested for CoAP, the REST framework automatically splits the data.
*/
void
helloworld_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
const char *len = NULL;
/* Some data that has the length up to REST_MAX_CHUNK_SIZE. For more, see the chunk resource. */
char const * const message = "Hello World! ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxy";
int length = 12; /* |<-------->| */
/* The query string can be retrieved by rest_get_query() or parsed for its key-value pairs. */
if (REST.get_query_variable(request, "len", &len)) {
length = atoi(len);
if (length<0) length = 0;
if (length>REST_MAX_CHUNK_SIZE) length = REST_MAX_CHUNK_SIZE;
memcpy(buffer, message, length);
} else {
memcpy(buffer, message, length);
}
REST.set_header_content_type(response, REST.type.TEXT_PLAIN); /* text/plain is the default, hence this option could be omitted. */
REST.set_header_etag(response, (uint8_t *) &length, 1);
REST.set_response_payload(response, buffer, length);
}
#endif
/******************************************************************************/
#if REST_RES_MIRROR
/* This resource mirrors the incoming request. It shows how to access the options and how to set them for the response. */
RESOURCE(mirror, METHOD_GET | METHOD_POST | METHOD_PUT | METHOD_DELETE, "debug/mirror", "title=\"Returns your decoded message\";rt=\"Debug\"");
void
mirror_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
/* The ETag and Token is copied to the header. */
uint8_t opaque[] = {0x0A, 0xBC, 0xDE};
/* Strings are not copied, so use static string buffers or strings in .text memory (char *str = "string in .text";). */
static char location[] = {'/','f','/','a','?','k','&','e', 0};
/* Getter for the header option Content-Type. If the option is not set, text/plain is returned by default. */
unsigned int content_type = REST.get_header_content_type(request);
/* The other getters copy the value (or string/array pointer) to the given pointers and return 1 for success or the length of strings/arrays. */
uint32_t max_age_and_size = 0;
const char *str = NULL;
uint32_t observe = 0;
const uint8_t *bytes = NULL;
uint32_t block_num = 0;
uint8_t block_more = 0;
uint16_t block_size = 0;
const char *query = "";
int len = 0;
/* Mirror the received header options in the response payload. Unsupported getters (e.g., rest_get_header_observe() with HTTP) will return 0. */
int strpos = 0;
/* snprintf() counts the terminating '\0' to the size parameter.
* The additional byte is taken care of by allocating REST_MAX_CHUNK_SIZE+1 bytes in the REST framework.
* Add +1 to fill the complete buffer, as the payload does not need a terminating '\0'. */
if (content_type!=-1)
{
strpos += snprintf((char *)buffer, REST_MAX_CHUNK_SIZE+1, "CT %u\n", content_type);
}
/* Some getters such as for ETag or Location are omitted, as these options should not appear in a request.
* Max-Age might appear in HTTP requests or used for special purposes in CoAP. */
if (strpos<=REST_MAX_CHUNK_SIZE && REST.get_header_max_age(request, &max_age_and_size))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "MA %lu\n", max_age_and_size);
}
/* For HTTP this is the Length option, for CoAP it is the Size option. */
if (strpos<=REST_MAX_CHUNK_SIZE && REST.get_header_length(request, &max_age_and_size))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "SZ %lu\n", max_age_and_size);
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_header_host(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "UH %.*s\n", len, str);
}
/* CoAP-specific example: actions not required for normal RESTful Web service. */
#if WITH_COAP > 1
if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_observe(request, &observe))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Ob %lu\n", observe);
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_token(request, &bytes)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "To 0x");
int index = 0;
for (index = 0; index<len; ++index) {
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%02X", bytes[index]);
}
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "\n");
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_etag(request, &bytes)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "ET 0x");
int index = 0;
for (index = 0; index<len; ++index) {
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%02X", bytes[index]);
}
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "\n");
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_uri_path(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "UP ");
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%.*s\n", len, str);
}
#if WITH_COAP == 3
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Lo %.*s\n", len, str);
}
if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Bl %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
}
#else
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_path(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "LP %.*s\n", len, str);
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_query(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "LQ %.*s\n", len, str);
}
if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block2(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "B2 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
}
/*
* Critical Block1 option is currently rejected by engine.
*
if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block1(request, &block_num, &block_more, &block_size, NULL))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "B1 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
}
*/
#endif /* CoAP > 03 */
#endif /* CoAP-specific example */
if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_query(request, &query)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Qu %.*s\n", len, query);
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_request_payload(request, &bytes)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%.*s", len, bytes);
}
if (strpos >= REST_MAX_CHUNK_SIZE)
{
buffer[REST_MAX_CHUNK_SIZE-1] = 0xBB; /* '»' to indicate truncation */
}
REST.set_response_payload(response, buffer, strpos);
PRINTF("/mirror options received: %s\n", buffer);
/* Set dummy header options for response. Like getters, some setters are not implemented for HTTP and have no effect. */
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
REST.set_header_max_age(response, 17); /* For HTTP, browsers will not re-request the page for 17 seconds. */
REST.set_header_etag(response, opaque, 2);
REST.set_header_location(response, location); /* Initial slash is omitted by framework */
REST.set_header_length(response, strpos); /* For HTTP, browsers will not re-request the page for 10 seconds. CoAP action depends on the client. */
/* CoAP-specific example: actions not required for normal RESTful Web service. */
#if WITH_COAP > 1
coap_set_header_uri_host(response, "tiki");
coap_set_header_observe(response, 10);
#if WITH_COAP == 3
coap_set_header_block(response, 42, 0, 64); /* The block option might be overwritten by the framework when blockwise transfer is requested. */
#else
coap_set_header_proxy_uri(response, "ftp://x");
coap_set_header_block2(response, 42, 0, 64); /* The block option might be overwritten by the framework when blockwise transfer is requested. */
coap_set_header_block1(response, 23, 0, 16);
coap_set_header_accept(response, TEXT_PLAIN);
coap_set_header_if_none_match(response);
#endif /* CoAP > 03 */
#endif /* CoAP-specific example */
}
#endif /* REST_RES_MIRROR */
/******************************************************************************/
#if REST_RES_CHUNKS
/*
* For data larger than REST_MAX_CHUNK_SIZE (e.g., stored in flash) resources must be aware of the buffer limitation
* and split their responses by themselves. To transfer the complete resource through a TCP stream or CoAP's blockwise transfer,
* the byte offset where to continue is provided to the handler as int32_t pointer.
* These chunk-wise resources must set the offset value to its new position or -1 of the end is reached.
* (The offset for CoAP's blockwise transfer can go up to 2'147'481'600 = ~2047 M for block size 2048 (reduced to 1024 in observe-03.)
*/
RESOURCE(chunks, METHOD_GET, "test/chunks", "title=\"Blockwise demo\";rt=\"Data\"");
#define CHUNKS_TOTAL 2050
void
chunks_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
int32_t strpos = 0;
/* Check the offset for boundaries of the resource data. */
if (*offset>=CHUNKS_TOTAL)
{
REST.set_response_status(response, REST.status.BAD_OPTION);
/* A block error message should not exceed the minimum block size (16). */
const char *error_msg = "BlockOutOfScope";
REST.set_response_payload(response, error_msg, strlen(error_msg));
return;
}
/* Generate data until reaching CHUNKS_TOTAL. */
while (strpos<preferred_size)
{
strpos += snprintf((char *)buffer+strpos, preferred_size-strpos+1, "|%ld|", *offset);
}
/* snprintf() does not adjust return value if truncated by size. */
if (strpos > preferred_size)
{
strpos = preferred_size;
}
/* Truncate if above CHUNKS_TOTAL bytes. */
if (*offset+(int32_t)strpos > CHUNKS_TOTAL)
{
strpos = CHUNKS_TOTAL - *offset;
}
REST.set_response_payload(response, buffer, strpos);
/* IMPORTANT for chunk-wise resources: Signal chunk awareness to REST engine. */
*offset += strpos;
/* Signal end of resource representation. */
if (*offset>=CHUNKS_TOTAL)
{
*offset = -1;
}
}
#endif
/******************************************************************************/
#if REST_RES_SEPARATE && defined (PLATFORM_HAS_BUTTON) && WITH_COAP > 3
/* Required to manually (=not by the engine) handle the response transaction. */
#if WITH_COAP == 7
#include "er-coap-07-separate.h"
#include "er-coap-07-transactions.h"
#elif WITH_COAP == 12
#include "er-coap-12-separate.h"
#include "er-coap-12-transactions.h"
#elif WITH_COAP == 13
#include "er-coap-13-separate.h"
#include "er-coap-13-transactions.h"
#endif
/*
* CoAP-specific example for separate responses.
* Note the call "rest_set_pre_handler(&resource_separate, coap_separate_handler);" in the main process.
* The pre-handler takes care of the empty ACK and updates the MID and message type for CON requests.
* The resource handler must store all information that required to finalize the response later.
*/
RESOURCE(separate, METHOD_GET, "test/separate", "title=\"Separate demo\"");
/* A structure to store the required information */
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;
static uint8_t separate_active = 0;
static application_separate_store_t separate_store[1];
void
separate_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_separate_reject();
}
else
{
separate_active = 1;
/* 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");
}
}
void
separate_finalize_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). */
separate_active = 0;
}
else
{
/*
* Set timer for retry, send error message, ...
* The example simply waits for another button press.
*/
}
} /* if (separate_active) */
}
#endif
/******************************************************************************/
#if REST_RES_PUSHING
/*
* Example for a periodic resource.
* It takes an additional period parameter, which defines the interval to call [name]_periodic_handler().
* A default post_handler takes care of subscriptions by managing a list of subscribers to notify.
*/
PERIODIC_RESOURCE(pushing, METHOD_GET, "test/push", "title=\"Periodic demo\";obs", 5*CLOCK_SECOND);
void
pushing_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
/* Usually, a CoAP server would response with the resource representation matching the periodic_handler. */
const char *msg = "It's periodic!";
REST.set_response_payload(response, msg, strlen(msg));
/* A post_handler that handles subscriptions will be called for periodic resources by the REST framework. */
}
/*
* Additionally, a handler function named [resource name]_handler must be implemented for each PERIODIC_RESOURCE.
* It will be called by the REST manager process with the defined period.
*/
void
pushing_periodic_handler(resource_t *r)
{
static uint16_t obs_counter = 0;
static char content[11];
++obs_counter;
PRINTF("TICK %u for /%s\n", obs_counter, r->url);
/* Build notification. */
coap_packet_t notification[1]; /* This way the packet can be treated as pointer as usual. */
coap_init_message(notification, COAP_TYPE_NON, REST.status.OK, 0 );
coap_set_payload(notification, content, snprintf(content, sizeof(content), "TICK %u", obs_counter));
/* Notify the registered observers with the given message type, observe option, and payload. */
REST.notify_subscribers(r, obs_counter, notification);
}
#endif
/******************************************************************************/
#if REST_RES_EVENT && defined (PLATFORM_HAS_BUTTON)
/*
* Example for an event resource.
* Additionally takes a period parameter that defines the interval to call [name]_periodic_handler().
* A default post_handler takes care of subscriptions and manages a list of subscribers to notify.
*/
EVENT_RESOURCE(event, METHOD_GET, "sensors/button", "title=\"Event demo\";obs");
void
event_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
/* Usually, a CoAP server would response with the current resource representation. */
const char *msg = "It's eventful!";
REST.set_response_payload(response, (uint8_t *)msg, strlen(msg));
/* A post_handler that handles subscriptions/observing will be called for periodic resources by the framework. */
}
/* Additionally, a handler function named [resource name]_event_handler must be implemented for each PERIODIC_RESOURCE defined.
* It will be called by the REST manager process with the defined period. */
void
event_event_handler(resource_t *r)
{
static uint16_t event_counter = 0;
static char content[12];
++event_counter;
PRINTF("TICK %u for /%s\n", event_counter, r->url);
/* Build notification. */
coap_packet_t notification[1]; /* This way the packet can be treated as pointer as usual. */
coap_init_message(notification, COAP_TYPE_CON, REST.status.OK, 0 );
coap_set_payload(notification, content, snprintf(content, sizeof(content), "EVENT %u", event_counter));
/* Notify the registered observers with the given message type, observe option, and payload. */
REST.notify_subscribers(r, event_counter, notification);
}
#endif /* PLATFORM_HAS_BUTTON */
/******************************************************************************/
#if REST_RES_SUB
/*
* Example for a resource that also handles all its sub-resources.
* Use REST.get_url() to multiplex the handling of the request depending on the Uri-Path.
*/
RESOURCE(sub, METHOD_GET | HAS_SUB_RESOURCES, "test/path", "title=\"Sub-resource demo\"");
void
sub_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
const char *uri_path = NULL;
int len = REST.get_url(request, &uri_path);
int base_len = strlen(resource_sub.url);
if (len==base_len)
{
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "Request any sub-resource of /%s", resource_sub.url);
}
else
{
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, ".%.*s", len-base_len, uri_path+base_len);
}
REST.set_response_payload(response, buffer, strlen((char *)buffer));
}
#endif
/******************************************************************************/
#if defined (PLATFORM_HAS_LEDS)
/******************************************************************************/
#if REST_RES_LEDS
/*A simple actuator example, depending on the color query parameter and post variable mode, corresponding led is activated or deactivated*/
RESOURCE(leds, METHOD_POST | METHOD_PUT , "actuators/leds", "title=\"LEDs: ?color=r|g|b, POST/PUT mode=on|off\";rt=\"Control\"");
void
leds_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
size_t len = 0;
const char *color = NULL;
const char *mode = NULL;
uint8_t led = 0;
int success = 1;
if ((len=REST.get_query_variable(request, "color", &color))) {
PRINTF("color %.*s\n", len, color);
if (strncmp(color, "r", len)==0) {
led = LEDS_RED;
} else if(strncmp(color,"g", len)==0) {
led = LEDS_GREEN;
} else if (strncmp(color,"b", len)==0) {
led = LEDS_BLUE;
} else {
success = 0;
}
} else {
success = 0;
}
if (success && (len=REST.get_post_variable(request, "mode", &mode))) {
PRINTF("mode %s\n", mode);
if (strncmp(mode, "on", len)==0) {
leds_on(led);
} else if (strncmp(mode, "off", len)==0) {
leds_off(led);
} else {
success = 0;
}
} else {
success = 0;
}
if (!success) {
REST.set_response_status(response, REST.status.BAD_REQUEST);
}
}
#endif
/******************************************************************************/
#if REST_RES_TOGGLE
/* A simple actuator example. Toggles the red led */
RESOURCE(toggle, METHOD_POST, "actuators/toggle", "title=\"Red LED\";rt=\"Control\"");
void
toggle_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
leds_toggle(LEDS_RED);
}
#endif
#endif /* PLATFORM_HAS_LEDS */
/******************************************************************************/
#if REST_RES_LIGHT && defined (PLATFORM_HAS_LIGHT)
/* A simple getter example. Returns the reading from light sensor with a simple etag */
RESOURCE(light, METHOD_GET, "sensors/light", "title=\"Photosynthetic and solar light (supports JSON)\";rt=\"LightSensor\"");
void
light_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
uint16_t light_photosynthetic = light_sensor.value(LIGHT_SENSOR_PHOTOSYNTHETIC);
uint16_t light_solar = light_sensor.value(LIGHT_SENSOR_TOTAL_SOLAR);
const uint16_t *accept = NULL;
int num = REST.get_header_accept(request, &accept);
if ((num==0) || (num && accept[0]==REST.type.TEXT_PLAIN))
{
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "%u;%u", light_photosynthetic, light_solar);
REST.set_response_payload(response, (uint8_t *)buffer, strlen((char *)buffer));
}
else if (num && (accept[0]==REST.type.APPLICATION_XML))
{
REST.set_header_content_type(response, REST.type.APPLICATION_XML);
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "<light photosynthetic=\"%u\" solar=\"%u\"/>", light_photosynthetic, light_solar);
REST.set_response_payload(response, buffer, strlen((char *)buffer));
}
else if (num && (accept[0]==REST.type.APPLICATION_JSON))
{
REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "{'light':{'photosynthetic':%u,'solar':%u}}", light_photosynthetic, light_solar);
REST.set_response_payload(response, buffer, strlen((char *)buffer));
}
else
{
REST.set_response_status(response, REST.status.NOT_ACCEPTABLE);
const char *msg = "Supporting content-types text/plain, application/xml, and application/json";
REST.set_response_payload(response, msg, strlen(msg));
}
}
#endif /* PLATFORM_HAS_LIGHT */
/******************************************************************************/
#if REST_RES_BATTERY && defined (PLATFORM_HAS_BATTERY)
/* A simple getter example. Returns the reading from light sensor with a simple etag */
RESOURCE(battery, METHOD_GET, "sensors/battery", "title=\"Battery status\";rt=\"Battery\"");
void
battery_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
int battery = battery_sensor.value(0);
const uint16_t *accept = NULL;
int num = REST.get_header_accept(request, &accept);
if ((num==0) || (num && accept[0]==REST.type.TEXT_PLAIN))
{
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "%d", battery);
REST.set_response_payload(response, (uint8_t *)buffer, strlen((char *)buffer));
}
else if (num && (accept[0]==REST.type.APPLICATION_JSON))
{
REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "{'battery':%d}", battery);
REST.set_response_payload(response, buffer, strlen((char *)buffer));
}
else
{
REST.set_response_status(response, REST.status.NOT_ACCEPTABLE);
const char *msg = "Supporting content-types text/plain and application/json";
REST.set_response_payload(response, msg, strlen(msg));
}
}
#endif /* PLATFORM_HAS_BATTERY */
#if defined (PLATFORM_HAS_RADIO) && REST_RES_RADIO
/* A simple getter example. Returns the reading of the rssi/lqi from radio sensor */
RESOURCE(radio, METHOD_GET, "sensor/radio", "title=\"RADIO: ?p=lqi|rssi\";rt=\"RadioSensor\"");
void
radio_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
size_t len = 0;
const char *p = NULL;
uint8_t param = 0;
int success = 1;
const uint16_t *accept = NULL;
int num = REST.get_header_accept(request, &accept);
if ((len=REST.get_query_variable(request, "p", &p))) {
PRINTF("p %.*s\n", len, p);
if (strncmp(p, "lqi", len)==0) {
param = RADIO_SENSOR_LAST_VALUE;
} else if(strncmp(p,"rssi", len)==0) {
param = RADIO_SENSOR_LAST_PACKET;
} else {
success = 0;
}
} else {
success = 0;
}
if (success) {
if ((num==0) || (num && accept[0]==REST.type.TEXT_PLAIN))
{
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "%d", radio_sensor.value(param));
REST.set_response_payload(response, (uint8_t *)buffer, strlen((char *)buffer));
}
else if (num && (accept[0]==REST.type.APPLICATION_JSON))
{
REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
if (param == RADIO_SENSOR_LAST_VALUE) {
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "{'lqi':%d}", radio_sensor.value(param));
} else if (param == RADIO_SENSOR_LAST_PACKET) {
snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "{'rssi':%d}", radio_sensor.value(param));
}
REST.set_response_payload(response, buffer, strlen((char *)buffer));
}
else
{
REST.set_response_status(response, REST.status.NOT_ACCEPTABLE);
const char *msg = "Supporting content-types text/plain and application/json";
REST.set_response_payload(response, msg, strlen(msg));
}
} else {
REST.set_response_status(response, REST.status.BAD_REQUEST);
}
}
#endif
PROCESS(rest_server_example, "Erbium Example Server");
AUTOSTART_PROCESSES(&rest_server_example);
PROCESS_THREAD(rest_server_example, ev, data)
{
PROCESS_BEGIN();
PRINTF("Starting Erbium Example Server\n");
#ifdef RF_CHANNEL
PRINTF("RF channel: %u\n", RF_CHANNEL);
#endif
#ifdef IEEE802154_PANID
PRINTF("PAN ID: 0x%04X\n", IEEE802154_PANID);
#endif
PRINTF("uIP buffer: %u\n", UIP_BUFSIZE);
PRINTF("LL header: %u\n", UIP_LLH_LEN);
PRINTF("IP+UDP header: %u\n", UIP_IPUDPH_LEN);
PRINTF("REST max chunk: %u\n", REST_MAX_CHUNK_SIZE);
/* Initialize the REST engine. */
rest_init_engine();
/* Activate the application-specific resources. */
#if REST_RES_HELLO
rest_activate_resource(&resource_helloworld);
#endif
#if REST_RES_MIRROR
rest_activate_resource(&resource_mirror);
#endif
#if REST_RES_CHUNKS
rest_activate_resource(&resource_chunks);
#endif
#if REST_RES_PUSHING
rest_activate_periodic_resource(&periodic_resource_pushing);
#endif
#if defined (PLATFORM_HAS_BUTTON) && REST_RES_EVENT
rest_activate_event_resource(&resource_event);
#endif
#if defined (PLATFORM_HAS_BUTTON) && REST_RES_SEPARATE && WITH_COAP > 3
/* No pre-handler anymore, user coap_separate_accept() and coap_separate_reject(). */
rest_activate_resource(&resource_separate);
#endif
#if defined (PLATFORM_HAS_BUTTON) && (REST_RES_EVENT || (REST_RES_SEPARATE && WITH_COAP > 3))
SENSORS_ACTIVATE(button_sensor);
#endif
#if REST_RES_SUB
rest_activate_resource(&resource_sub);
#endif
#if defined (PLATFORM_HAS_LEDS)
#if REST_RES_LEDS
rest_activate_resource(&resource_leds);
#endif
#if REST_RES_TOGGLE
rest_activate_resource(&resource_toggle);
#endif
#endif /* PLATFORM_HAS_LEDS */
#if defined (PLATFORM_HAS_LIGHT) && REST_RES_LIGHT
SENSORS_ACTIVATE(light_sensor);
rest_activate_resource(&resource_light);
#endif
#if defined (PLATFORM_HAS_BATTERY) && REST_RES_BATTERY
SENSORS_ACTIVATE(battery_sensor);
rest_activate_resource(&resource_battery);
#endif
#if defined (PLATFORM_HAS_RADIO) && REST_RES_RADIO
SENSORS_ACTIVATE(radio_sensor);
rest_activate_resource(&resource_radio);
#endif
/* Define application-specific events here. */
while(1) {
PROCESS_WAIT_EVENT();
#if defined (PLATFORM_HAS_BUTTON)
if (ev == sensors_event && data == &button_sensor) {
PRINTF("BUTTON\n");
#if REST_RES_EVENT
/* Call the event_handler for this application-specific event. */
event_event_handler(&resource_event);
#endif
#if REST_RES_SEPARATE && WITH_COAP>3
/* Also call the separate response example handler. */
separate_finalize_handler();
#endif
}
#endif /* PLATFORM_HAS_BUTTON */
} /* while (1) */
PROCESS_END();
}
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