Sending a positive octet of zero bits over a socket

I am currently attempting to communicate with an external application over TCP/IP based socket. I have successfully established a connection with the client and received some data. This manual here states that

After this command is received, the client must read an acknowledgement octet from the daemon. A positive acknowledgement is an octet of zero bits. A negative acknowledgement is an octet of any other pattern.

I would like to send a positive acknowledgment and I am sending it this way

void WriteData(std::string content)
{
    send(newsockfd,content.c_str(),content.length(),0);
}

WriteData("00000000");

My question is if I am sending this data corectly ?