sendMessage method

int sendMessage(String text, { MessageControl control = const MessageControl(), })

Send a message over this socket

This wraps the native srt_sendmsg2 function and allows sending messages with control information (TTL, in-order delivery, etc.) in message mode rather than stream mode.

text is the message data to send ttl is the time-to-live in milliseconds (default -1 for infinite) inOrder specifies whether the message must arrive in order (default false)

Returns the number of bytes actually sent.

Throws SrtException if sending fails

Implementation

int sendMessage(
  String text, {
  MessageControl control = const MessageControl(),
}) {
  _checkNotClosed();

  final payload = Uint8List.fromList(text.codeUnits);
  // Create and initialize message control structure
  final buffer = calloc<ffi.Char>(payload.length);
  final mctrl = control.toNative();

  try {
    // Initialize message control
    Srt.bindings.srt_msgctrl_init(mctrl);

    // Copy payload to native buffer
    for (int i = 0; i < payload.length; i++) {
      buffer[i] = payload[i];
    }

    final bytesSent = Srt.bindings.srt_sendmsg2(
      _socketHandle,
      buffer,
      payload.length,
      mctrl,
    );

    checkSrtResult(bytesSent, operation: "send a menssage, no bytes sended");

    return bytesSent;
  } finally {
    calloc.free(mctrl);
    calloc.free(buffer);
  }
}