Real Time Text Receiver

This program is able to receive chat message in real time on port 5060.

Use realtimetext_sender to generate chat message usage: ./realtimetext_receiver

/*
 * Copyright (c) 2010-2022 Belledonne Communications SARL.
 *
 * This file is part of Liblinphone
 * (see https://gitlab.linphone.org/BC/public/liblinphone).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of 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 of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "linphone/core.h"

#include <signal.h>

static bool_t running = TRUE;

static void stop(int signum) {
        running = FALSE;
}

int main(int argc, char *argv[]) {
        LinphoneCoreVTable vtable = {0};
        LinphoneCore *lc;
        LinphoneCall *call = NULL;
        LinphoneChatRoom *chat_room;
        LinphoneChatMessage *chat_message = NULL;
        const char *dest = NULL;
        LCSipTransports tp;
        tp.udp_port = LC_SIP_TRANSPORT_RANDOM;
        tp.tcp_port = LC_SIP_TRANSPORT_RANDOM;
        tp.tls_port = LC_SIP_TRANSPORT_RANDOM;

        /* take the destination sip uri from the command line arguments */
        if (argc > 1) {
                dest = argv[1];
        }

        signal(SIGINT, stop);

#ifdef DEBUG_LOGS
        linphone_core_enable_logs(NULL); /*enable liblinphone logs.*/
#endif

        /*
         Instanciate a LinphoneCore object given the LinphoneCoreVTable
        */
        lc = linphone_core_new(&vtable, NULL, NULL, NULL);

        linphone_core_set_sip_transports(lc, &tp); /*to avoid port colliding with receiver*/
        if (dest) {
                /*
                 Place an outgoing call with rtt enabled
                */
                LinphoneCallParams *cp = linphone_core_create_call_params(lc, NULL);
                linphone_call_params_enable_realtime_text(cp, TRUE); /*enable real time text*/
                call = linphone_core_invite_with_params(lc, dest, cp);
                linphone_call_params_unref(cp);
                if (call == NULL) {
                        printf("Could not place call to %s\n", dest);
                        goto end;
                } else printf("Call to %s is in progress...", dest);
                linphone_call_ref(call);
        }
        /*wait for call to be established*/
        while (running && (linphone_call_get_state(call) == LinphoneCallOutgoingProgress ||
                           linphone_call_get_state(call) == LinphoneCallOutgoingInit)) {
                linphone_core_iterate(lc);
                ms_usleep(50000);
        }
        /*check if call is established*/
        switch (linphone_call_get_state(call)) {
                case LinphoneCallError:
                case LinphoneCallReleased:
                case LinphoneCallEnd:
                        printf("Could not place call to %s\n", dest);
                        goto end;
                        break;
                default:
                        break;
                        /*continue*/
        }

        chat_room = linphone_call_get_chat_room(call); /*create a chat room associated to this call*/

        /* main loop for sending message and doing background linphonecore work: */
        while (running) {
                int character;
                /*to disable terminal buffering*/
                if (system("/bin/stty raw") == -1) {
                        ms_error("/bin/stty error");
                }
                character = getchar();
                if (system("/bin/stty cooked") == -1) {
                        ms_error("/bin/stty error");
                }
                if (character == 0x03) { /*CTRL C*/
                        running = 0;
                        break;
                }
                if (character != EOF) {
                        /* user has typed something*/
                        if (chat_message == NULL) {
                                /*create a new message*/
                                chat_message = linphone_chat_room_create_message(chat_room, ""); /*create an empty message*/
                        }
                        if (character == '\r') {
                                /*new line, committing message*/
                                linphone_chat_room_send_chat_message(chat_room, chat_message);
                                chat_message = NULL; /*reset message*/
                        } else {
                                linphone_chat_message_put_char(chat_message, character); /*send char in realtime*/
                        }
                }
                linphone_core_iterate(lc);
                ms_usleep(50000);
        }
        if (call && linphone_call_get_state(call) != LinphoneCallEnd) {
                /* terminate the call */
                printf("Terminating the call...\n");
                linphone_core_terminate_call(lc, call);
                /*at this stage we don't need the call object */
                linphone_call_unref(call);
        }

end:
        printf("Shutting down...\n");
        linphone_core_destroy(lc);
        printf("Exited\n");
        return 0;
}