linphone chat example

This program is a _very_ simple usage example of liblinphone, desmonstrating how to send/receive SIP MESSAGE from a sip uri identity passed from the command line. 
Argument must be like sip:[e-mail] . 
ex chatroom sip:[e-mail] 

/*linphoneCopyright (C) 2010  Belledonne Communications SARL This program is free software; you can redistribute it and/ormodify it under the terms of the GNU General Public Licenseas published by the Free Software Foundation; either version 2of the License, or (at your option) any later version.This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See theGNU General Public License for more details.You should have received a copy of the GNU General Public Licensealong with this program; if not, write to the Free SoftwareFoundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.*/#ifdef IN_LINPHONE#include "linphonecore.h"#else#include "linphone/linphonecore.h"#endif#include <signal.h>static bool_t running=TRUE;static void stop(int signum){        running=FALSE;}void text_received(LinphoneCore *lc, LinphoneChatRoom *room, const LinphoneAddress *from, const char *message) {        printf(" Message [%s] received from [%s] \n",message,linphone_address_as_string (from));}LinphoneCore *lc;int main(int argc, char *argv[]){        LinphoneCoreVTable vtable={0};        char* dest_friend=NULL;        /* takes   sip uri  identity from the command line arguments */        if (argc>1){                dest_friend=argv[1];        }        signal(SIGINT,stop);//#define DEBUG#ifdef DEBUG        linphone_core_enable_logs(NULL); /*enable liblinphone logs.*/#endif        /*          Fill the LinphoneCoreVTable with application callbacks.         All are optional. Here we only use the text_received callback         in order to get notifications about incoming message.         */        vtable.text_received=text_received;        /*         Instantiate a LinphoneCore object given the LinphoneCoreVTable        */        lc=linphone_core_new(&vtable,NULL,NULL,NULL);        /*Next step is to create a chat root*/        LinphoneChatRoom* chat_room = linphone_core_create_chat_room(lc,dest_friend);        linphone_chat_room_send_message(chat_room,"Hello world"); /*sending message*/        /* main loop for receiving incoming messages and doing background linphone core work: */        while(running){                linphone_core_iterate(lc);                ms_usleep(50000);        }        printf("Shutting down...\n");        linphone_chat_room_destroy(chat_room);        linphone_core_destroy(lc);        printf("Exited\n");        return 0;}