Yes We Can / yeswecancoap

Coap Client and Server

Dependencies:   DebugLib EthernetInterface cantcoap mbed-rtos

Dependents:   COAP coap

Fork of yeswecancoap by Sille Van Landschoot

YesWeCanCoap

Is a small coap client and server library for mbed based on the cantcoap library.

Import librarycantcoap

This is CoAP library with a focus on simplicity. It offers minimal CoAP PDU construction and decoding to and from byte buffers.

Last commit 30 Jan 2014 by Ashley Mills

yeswecancoap server enables easy implementation of coap resources, each with a dedicated function. When the function is registered by the server, it will do the rest.

Coap server example

Repository: YesWeCanCoap-example

Coap client example

under construction

server.cpp

Committer:
sillevl
Date:
2015-10-23
Revision:
28:4f71d9d10011
Parent:
27:22436933025a
Child:
29:62113a57353b

File content as of revision 28:4f71d9d10011:

#include "server.h"


Server::Server()
{
    debug_init();
    debug_set_newline("\r\n");
    
    eth.init(); //Use DHCP
    eth.connect();
    printf("\r\nServer IP Address is %s\r\n", eth.getIPAddress());
    
    server.bind(5683);
    server.set_blocking(false, 100);
}

void Server::enableBroadcast(int broadcast)
{
    server.set_broadcasting(broadcast);
}

void Server::add(char* uri, void (*fnc)(Request*, Response*), CoapCode method)
{
    Resource res = {uri, fnc, method};
    resources.push_back(res);
}

void Server::waitForRequest()
{

    char buffer[UDP_BUFFER_SIZE];
    //printf("\r\nWaiting for UDP packet...\r\n");
    int size = server.receiveFrom(client, buffer, sizeof(buffer));
    buffer[size] = '\0';

    CoapPDU *req = new CoapPDU((uint8_t*)buffer,256, size);
    if(req->validate()) {
        
        char uriBuffer[URI_BUFFER_SIZE];
        int uriLength;
        uint8_t token[TOKEN_BUFFER_SIZE];
        uint8_t tokenLength;
    
        //req->printHuman();

        req->getURI(uriBuffer,URI_BUFFER_SIZE,&uriLength); 
        tokenLength = req->getTokenLength();
        memcpy(token, req->getTokenPointer(), tokenLength);
    
        int resourceIndex = findResource(uriBuffer, req->getCode());
    
        
        CoapPDU *res = new CoapPDU();
        res->setMessageID(req->getMessageID());
        res->setToken(token,4);
        
        switch(req->getType()){
            case CoapPDU::COAP_NON_CONFIRMABLE: 
                res->setType(CoapPDU::COAP_NON_CONFIRMABLE);
                break;
            case CoapPDU::COAP_CONFIRMABLE:
                res->setType(CoapPDU::COAP_ACKNOWLEDGEMENT);
        }
        
        res->setCode(CoapPDU::COAP_NOT_FOUND);
        
        if(resourceIndex != -1){
            res->setCode(CoapPDU::COAP_NOT_IMPLEMENTED);
            resources[resourceIndex].function((Request*)req, (Response*)res);
        }
        
        server.sendTo(client, (char*) res->getPDUPointer(),res->getPDULength());
        
        delete res;
        delete req;
    }
}

int Server::findResource(char* uri, CoapPDU::Code method)
{
    for(int i = 0; i < resources.size(); i++){
        if(strcmp(uri, resources[i].uri) == 0 && method == resources[i].method) return i;
    }
    return -1;
}