Unable to bind socket errors if ESP32 not powercycled between uploads, strange error messages

It looks like there's a problem with servers not getting cleaned up when the board is reset (for example, when you click "send to Espruino" in the IDE):

>process.version
="1v99"
>process.env
={
  "VERSION": "1v99",
  "GIT_COMMIT": "f0d66ba",
  "BOARD": "ESP32",
  "FLASH": 0, "RAM": 524288,
  "SERIAL": "30aea40f-0074",
  "CONSOLE": "Telnet",
  "MODULES": "Flash,Storage,fs," ... "r,crypto,neopixel",
  "EXPTR": 1073485304 }

First time I upload and try to fire up the server, it works. The second time:

ERROR: Socket bind failed
Uncaught InternalError: Unable to create socket
 at line 11 col 60
...(onPageRequest).listen(7348);

It isn't clear to me yet exactly what the key factor is that makes this fail, but the code below readily reproduces it for me. Upload code once.

Request in browser:
(board IP address):7348/status?un=testuser&pw=testpass

Upload code again. Watch for error in console.

var http = require("http");



function startup() {
	E.setTimeZone(-5);
	fetchTime();
    require("http").createServer(onPageRequest).listen(7348);
}

function fetchTime() {
	require("http").get("http://drazzy.com/time.shtml", function(res) {
  		var contents = "";
  		res.on('data', function(data) { contents += data; });
  		res.on('close', function() { setTime(contents); });
	}).on('error', function(e) {
  		console.log("ERROR", e);
	});
}

var CORS={'Access-Control-Allow-Origin':'*'};
// Network

function onPageRequest(req, res) {
  var a = url.parse(req.url, true);
  var resu=0;
  if (a.pathname=="/favicon.ico") {
    resu=404;
  } else {
    resu = handleCmd(a.pathname,a.query,res);
  }
  if (resu > 0) {
  	  res.writeHead(resu,CORS);
  	  if (resu==200) {res.write('{"error":false,"code":200,"text":"OK"}');}
  	  else if (resu==404) {res.write('{"error":true,"code":404,"text":"Not Found"}');}
  	  else if (resu==403) {res.write('{"error":true,"code":403,"text":"Unauthorized Client"}');}
  	  else if (resu==400) {res.write('{"error":true,"code":400,"text":"Bad Request"}');}
  } else if (resu===0) {
  	  res.writeHead(500,CORS);
  	  res.write('{"error":true,"code":500,"text":"Unknown Error"}');
  }
  res.end();
}


function handleCmd(path,query,res) {
	console.log(path);
	console.log(query);
	if (query.un!="testuser" || query.pw!="testpass") { 
		return 403;
	}
	if (path=="/status") {
		res.writeHead(200,CORS);
		res.write(JSON.stringify(cs));
        return -1;
	} else {
		return 404;
	}
}

var cs={ //cs=Current State
	DoorUp:0,
	DoorDown:0,
	Fridge:0,
	Humidity:null,
	Temperature:null,
	Pressure:null,
	Light:null
};
cs.Fargo=new Uint8Array(8);

function onInit() {
	setTimeout("startup()",5000);
}
onInit();

Powercycling the board fixes it.

Also, sometimes when I click send to Espruino, the following is printed to console:

>WARNING: --- gap_setScan 0
WARNING: Scan stop failed
WARNING: set rssi scan not implemeted yet
WARNING: has central connection not implemented yet

Much thanks to everyone for all the work they've put into the ESP32 support.