IssueTracker

we are able to make communication from sender to receiver.
but we can only send NUMBERS as a custom message ex: 123,45, etc
when we try to attach any string content eg: hello,hello122 or any character the receiver side does not get any message.
We have executed the following code :

 try {
        const channel = "urn:x-cast:testChannel";
        const iframe = document.getElementById("frame");
        const node = document.getElementById("message");
        const ctx = cast.framework.CastReceiverContext.getInstance();
        node.innerHTML = 'test1';
        ctx.addCustomMessageListener(channel, (evt) => {
          node.innerHTML = 'test...';
          ctx.sendCustomMessage('urn:x-cast:testChannel', evt.senderId, 'Message Invoked v3', (data) => {
            document.getElementById("message").innerHTML = 'message sent';
            iframe.src = "https://duchy-messages.bradnin.ch/";
            node.innerHTML = 'Message sent '
          })

          node.innerHTML = evt.senderId+ ' test ' +JSON.stringify(evt);
          alert('here');
        })

        ctx.start();
      } catch (e) {
        document.getElementById("message").innerHTML = JSON.stringify(e);
      }