(Node.js) Socket Receive String Until Specific Byte Value is Received

Demonstrates the Chilkat Socket ReceiveStringUntilByte 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 some strings, each terminated by a 0 byte.
    sock.SendString("This is the 1st string");
    sock.SendByte(0);
    sock.SendString("This is string number 2");
    sock.SendByte(0);

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

    // Now let's receive what is echoed back....
    // Receive each string and the NULL byte.
    // The call to ReceiveStringUntilByte will receive incoming data until the lookForByte is encountered.
    // The lookForByte is receive and discarded (it is not returned in the string)
    var lookForByte = 0;
    var s1 = sock.ReceiveStringUntilByte(lookForByte);
    if (sock.LastMethodSuccess == false) {
        console.log(sock.LastErrorText);
        return;
    }

    console.log(s1);

    var s2 = sock.ReceiveStringUntilByte(lookForByte);
    if (sock.LastMethodSuccess == false) {
        console.log(sock.LastErrorText);
        return;
    }

    console.log(s2);

    // The echo server will also echo back the final LF
    sock.ReceiveByte(true);
    maxWaitMs = 100;
    sock.Close(100);

    // Output:
    // This is the 1st string
    // This is string number 2

}

chilkatExample();