From 228038dffd5fa73df652dce37eb590a1e5d05104 Mon Sep 17 00:00:00 2001
From: "Rodrigo M. Albuquerque" <webrodrigo@gmail.com>
Date: Tue, 9 Aug 2016 12:20:18 -0300
Subject: [PATCH] add an option to keep tcp socket alive

---
 ZplPrinter/js/background.js |  1 +
 ZplPrinter/js/main.js       | 11 ++++++++++-
 ZplPrinter/main.html        | 17 ++++++++++++++++-
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/ZplPrinter/js/background.js b/ZplPrinter/js/background.js
index 9f199e9..0caabc6 100644
--- a/ZplPrinter/js/background.js
+++ b/ZplPrinter/js/background.js
@@ -19,6 +19,7 @@ chrome.runtime.onInstalled.addListener(function (details) {
             unit: '1',
             host: '127.0.0.1',
             port: '9100',
+            keepTcpSocket: false,
             saveLabels: false,
             filetype: '1',
             path: null,
diff --git a/ZplPrinter/js/main.js b/ZplPrinter/js/main.js
index 4e0d9cc..1458f82 100644
--- a/ZplPrinter/js/main.js
+++ b/ZplPrinter/js/main.js
@@ -19,7 +19,12 @@ $(document).ready(function () {
     chrome.sockets.tcp.onReceive.addListener(function (info) {
         notify('{0} bytes received from Client: <b>{1}</b> Port: <b>{2}</b>'.format(info.data.byteLength, clientSocketInfo.peerAddress, clientSocketInfo.peerPort), 'print', 'info', 1000);
         var zpls = String.fromCharCode.apply(null, new Uint8Array(info.data)).split(/\^XZ/);
-        chrome.sockets.tcp.close(info.socketId);
+        if (!configs.keepTcpSocket) {
+            chrome.sockets.tcp.close(info.socketId);
+            notify('Closing TCP Socket.');
+        } else {
+            notify('Keeping TCP Socket.');
+        }
         var factor = (configs.unit == '1') ? 1 : (configs.unit == '2') ? 2.54 : 25.4;
         var width = parseFloat(configs.width) / factor;
         var height = parseFloat(configs.height) / factor;
@@ -283,6 +288,8 @@ function saveConfigs() {
             configs[key] = $('#btn-filetype').attr('aria-valuenow');
         } else if (key == 'saveLabels') {
             configs[key] = $('#ckb-saveLabels').is(':checked');
+        } else if (key == 'keepTcpSocket') {
+            configs[key] = $('#ckb-keep-tcp-socket').is(':checked');
         } else if (key == 'path') {
             configs[key] = retainEntry
         } else {
@@ -314,6 +321,8 @@ function initConfigs() {
         } else if (key == 'isOn' && configs[key]) {
             toggleSwitch('.btn-toggle');
             startTcpServer();
+        } else if (key == 'keepTcpSocket') {
+            $('#ckb-keep-tcp-socket').prop('checked', configs[key]);
         } else if (key == 'path' && configs[key]) {
             retainEntry = configs[key];
             chrome.fileSystem.restoreEntry(configs[key], function (entry) {
diff --git a/ZplPrinter/main.html b/ZplPrinter/main.html
index 0fc6515..a11adcc 100644
--- a/ZplPrinter/main.html
+++ b/ZplPrinter/main.html
@@ -120,7 +120,22 @@
                                                 <input id="port" name="port" class="form-control" placeholder="9100" type="number" min="1" max="65535" required>
                                             </div>
                                         </td>
-                                        <td width="30%"></td>
+                                        <td width="30%">
+                                            <div class="checkbox" style="padding-right: 10px;">
+                                                <h5>
+                                                    <label>
+                                                        <input id="ckb-keep-tcp-socket" type="checkbox" />
+                                                        Keep TCP socket
+                                                        <a
+                                                          href="#"
+                                                          data-toggle="tooltip"
+                                                          title="Useful when using redirection serial port programs (eg socat on Linux).">
+                                                            <span  class="glyphicon glyphicon-question-sign"></span>
+                                                        </a>
+                                                    </label>
+                                                </h5>
+                                            </div>
+                                        </td>
                                     </tr>
                                 </table>
                             </div>