saas0801/static/equipment/mafp_serial/plugin/background.js

var socketId = 0;
chrome.app.runtime.onLaunched.addListener(function() {
  if (socketId) {
    console.log("close socket " +socketId);
    chrome.sockets.tcpServer.close(socketId);
    socketId = 0;
  }
  chrome.app.window.create('main.html', {
    id: "mainwin",
    innerBounds: {
      width: 670,
      height: 350,
      minWidth: 670,
      minHeight: 350
    }
  });
})
chrome.runtime.onMessage.addListener(function(request, sender, sendResponse)
{
  socketId = request.socketId;

});
chrome.runtime.onSuspend.addListener(function() { 
  if(socketId) {
    chrome.sockets.tcpServer.close(socketId);
    socketId = 0;
  }
});