Node.js

TCP Socket Send Byte and Receive Byte

Demonstrates the Chilkat Socket ReceiveByte and SendByte method. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    var sock = new chilkat.Socket();

    //  --------------------------------------------------------------------
    //  This example uses the public TCP echo service at https://tcpbin.com/
    //  --------------------------------------------------------------------

    var useTls = false;
    var port = 4242;
    var maxWaitMs = 5000;
    success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs);
    if (success == false) {
        console.log(sock.LastErrorText);
        return;
    }

    //  Wait a max of 2 seconds for a response..
    sock.MaxReadIdleMs = 2000;

    //  Send a byte.
    sock.SendByte(96);

    //  The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
    sock.SendByte(10);

    //  The echo server will echo back whatever is sent to it.
    //  We should be able to read the same byte back..
    //  After successfully reading, the byte value is available in the ReceivedInt property.
    var treatAsUnsignedInt = true;
    success = sock.ReceiveByte(treatAsUnsignedInt);
    if (success == false) {
        console.log(sock.LastErrorText);
        return;
    }

    //  Let's look at the value of the byte received.  It should be 96.
    console.log(sock.ReceivedInt);

    //  The echo server also echoed the LF back.
    success = sock.ReceiveByte(treatAsUnsignedInt);
    //  Assuming success..

    //  Should be decimal 10.
    console.log(sock.ReceivedInt);

}

chilkatExample();