(Node.js) Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods.

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

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

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 26 bytes contained in a Chilkat BinData
    var bdToSend = new chilkat.BinData();
    var i = 0;
    var byteVal = 65;
    while (i < 26) {
        bdToSend.AppendByte(byteVal);
        byteVal = byteVal+1;
        i = i+1;
    }

    // Send the contents of the BinData
    // Pass zero's in the 2nd and 3rd arguments to send the entire contents of the BinData.
    sock.SendBd(bdToSend,0,0);

    // 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 bytes back..
    var bdRecv = new chilkat.BinData();
    // Receive the 26 bytes previously sent, plus the LF char.
    success = sock.ReceiveBdN(27,bdRecv);
    if (success == false) {
        console.log(sock.LastErrorText);
        return;
    }

    // Show the contents of bdRecv in hex format
    console.log(bdRecv.GetEncoded("hex"));

    // Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A

}

chilkatExample();