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Nov 4, 2019
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Nov 2, 2019

RawBT: Websocket Server for ESC/POS Printers

RawBT requires PHP 5.4.0+ to run.
The utility is distributed as a Phar package.

Installing on user PC

For Windows

  • Run server (rawbt.bat - The application starts in a minimized window)

For Linux

  • php rawbt.phar

For Linux (run as daemon)

  • copy rawbt.service to /etc/systemd/system/rawbt.service
  • edit User, Group (don't run it as root), WorkingDirectory and ExecStart
  • sudo systemctl daemon-reload
  • sudo systemctl enable rawbt.service
  • sudo systemctl start rawbt.service

screenshot

  • Add bat file to startup

In the /doc directory you can find a useful utility (TrayIt) that can hide the window of a running server.

Front-end

https://rawbt.ru/mike42/example_rawbt/

function pc_print(data){
    var socket = new WebSocket("ws://127.0.0.1:40213/");
    socket.bufferType = "arraybuffer";
    socket.onerror = function(error) {
	  alert("Error");
    };			
	socket.onopen = function() {
		socket.send(data);
		socket.close(1000, "Work complete");
	};
}		
function android_print(data){
    window.location.href = data;  
}
function ajax_print(url, btn) {
    $.get(url, function (data) {
		var ua = navigator.userAgent.toLowerCase();
		var isAndroid = ua.indexOf("android") > -1; 
		if(isAndroid) {
		    android_print(data);
		}else{
		    pc_print(data);
		}
    });
}

Back-end demo

https://github.com/mike42/escpos-php/blob/development/example/rawbt-receipt.php

It is enough to specify the desired connector

    $connector = new RawbtPrintConnector();