(Node.js) TCP Socket Send Byte and Receive Byte

Demonstrates the Chilkat Socket ReceiveByte and SendByte method.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // 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;
    var 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();