th.iotkit2.ch / Mbed 2 deprecated COAPmbed

COAP mbed Beispiel

Dependencies:   EthernetInterface mbed-rtos mbed nsdl_lib

Fork of IoTKit_CoAP by mc-b

Constrained Application Protocol (Coap) ist ein Software-Protokoll welches für Internet der Dinge Geräte zugeschnitten ist.

COAP ist auf den meisten Geräten, die UDP Unterstützen, lauffähig.

Ein COAP fähiges Gerät publiziert seine Sensoren und Aktoren in einem Resource Directory oder stellt selber ein solches zur Verfügung.

Mittels Resource Discovery können die vorhandenen Sensoren und Aktoren mit ihren Attributen abgefragt werden.

resources/light.cpp

Committer:
stefan1691
Date:
2015-03-16
Revision:
12:2f67bf0e137e
Parent:
11:99178da0f3fa

File content as of revision 12:2f67bf0e137e:

// Light resource implementation
 
#include "mbed.h"
#include "nsdl_support.h"
#include "light.h"
 
#define LIGHT_RES_ID    "lt/0/dim"
 
extern Serial pc;
//PwmOut led1(LED1);
static PwmOut led2(D10);
static PwmOut led3(D11);
//PwmOut led4(LED4);
 
/* Only GET and PUT method allowed */
static uint8_t light_resource_cb(sn_coap_hdr_s *received_coap_ptr, sn_nsdl_addr_s *address, sn_proto_info_s * proto)
{
    sn_coap_hdr_s *coap_res_ptr = 0;
    static float led_dimm = 0;
    int led_state = 0;
    char led_dimm_temp[4];
 
    pc.printf("light callback\r\n");
 
    if(received_coap_ptr->msg_code == COAP_MSG_CODE_REQUEST_GET)
    {
        coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CONTENT);
 
        led_state = led_dimm * 100;
        sprintf(led_dimm_temp, "%d", led_state);
 
        coap_res_ptr->payload_len = strlen(led_dimm_temp);
        coap_res_ptr->payload_ptr = (uint8_t*)led_dimm_temp;
        sn_nsdl_send_coap_message(address, coap_res_ptr);
    }
    else if(received_coap_ptr->msg_code == COAP_MSG_CODE_REQUEST_PUT)
    {
        memcpy(led_dimm_temp, (char *)received_coap_ptr->payload_ptr, received_coap_ptr->payload_len);
 
        led_dimm_temp[received_coap_ptr->payload_len] = '\0';
 
        led_dimm = atof(led_dimm_temp);
        led_dimm = led_dimm/100;
 
        //led1.write(led_dimm);
        led2.write(led_dimm);
        led3.write(led_dimm);
        //led4.write(led_dimm);
 
        coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CHANGED);
        sn_nsdl_send_coap_message(address, coap_res_ptr);
    }
 
    sn_coap_parser_release_allocated_coap_msg_mem(coap_res_ptr);
    return 0;
}
 
int create_light_resource(sn_nsdl_resource_info_s *resource_ptr)
{
    nsdl_create_dynamic_resource(resource_ptr, sizeof(LIGHT_RES_ID)-1, (uint8_t*)LIGHT_RES_ID, 0, 0, 0, &light_resource_cb, (SN_GRS_GET_ALLOWED | SN_GRS_PUT_ALLOWED));
    return 0;
}