WebRTCChat_createAndSendAnswer.js

function createAndSendAnswer(){

        // Create Answer
        connection.createAnswer().then(
            answer => {
                log('Sent The Answer.');

                // Set Answer for negotiation
                connection.setLocalDescription(answer);

                // Send Answer to other peer
                socket.send(JSON.stringify(
                    {
                        action: 'onMessage',
                        type: 'answer',
                        data: answer,
                        id: clientId
                    }
                ));
            },
            error => {
                log('Error when creating an answer.');
                console.error(error);
            }
        );
    }