IoT wireless sensors network simulation, a small project for the Advanced Networks and Wireless Systems exam
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#include <stdio.h>
#include "contiki.h"
#include "contiki-net.h"
#include "rest-engine.h"
#include "net/ip/uip-debug.h"
int precious_resource = 0;
char sensor_name[32]; /* for RFC8428 */
/* handlers for coap */
void res_get_handler(void* request, void* response, uint8_t* buffer, uint16_t preferred_size, int32_t* offset) {
static char payload[128];
sprintf(payload, "[{\"n\":\"urn:it.unipi.ing.ce.netpp:%s\",\"v\":%d}]", sensor_name, precious_resource);
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
REST.set_response_payload(response, payload, strlen(payload));
printf("[D] GET handled\n");
}
void res_periodic_handler();
/* declare resource and set handlers */
PERIODIC_RESOURCE(myresource, "title=\"An observable resource\";rt=\"some descriptive text\";obs", res_get_handler, NULL, NULL, NULL, 60 * CLOCK_SECOND, res_periodic_handler);
void res_periodic_handler() {
/* sample some sensor */
/* byte mysample = *(some_bar + some_offset); */
++precious_resource;
printf("sampled the precious resource: %d\n", precious_resource);
/* Notify subscribers of the new sample */
REST.notify_subscribers(&myresource);
}
/* contiki protothread, as usual... */
PROCESS(main_process_name, "Simple-CoAP-Server");
AUTOSTART_PROCESSES(&main_process_name);
PROCESS_THREAD(main_process_name, ev, data) {
PROCESS_BEGIN();
printf("Started....\n");
/* print enabled addresses */
printf("My addresses:\n");
int i;
for (i = 0; i < UIP_DS6_ADDR_NB; ++i) {
if (uip_ds6_if.addr_list[i].isused) {
uip_debug_ipaddr_print(&uip_ds6_if.addr_list[i].ipaddr);
printf("\n");
}
}
/* set sensor_name as mac address */
for (i = 0; i < sizeof(uip_lladdr.addr); ++i) {
sprintf(sensor_name + i, "%02x", (unsigned char)uip_lladdr.addr[i]);
}
/* enable CoAP engine */
rest_init_engine();
rest_activate_resource(&myresource, "PreciousResource");
while (1) {
PROCESS_WAIT_EVENT();
}
PROCESS_END();
}