How to reset WIZnet 5500 while socket is not available?

Posted on
  • I used wiznet 5500 for tcp connection, but sometime I didn't know why it stopped. And then I tried to reset system, but the socket not avaiable still exiested. I had to power off the board then the wiznet work fined agnin.

    How to reset WIZnet 5500 while socket is not available?

    No free sockets found

    This is my code, and run on the board STM32F4DISCOVERY

    let WIZnet = require("WIZnet");
    let st = require("Storage");
    let WebServer = require('WebServer');
    let ip = "";
    let gateway = "";
    let eth = null;
    E.on('init', function () {
        SPI2.setup({mosi: B15, miso: B14, sck: B13});
        eth = WIZnet.connect(SPI2, B12);
        setTimeout(function () {
            eth.setIP({ip: ip, gateway: gateway, subnet: "",dns:""});
            console.log("ip", eth.getIP());
        }, 1500);
    function startServer() {
        var webs = new WebServer({
            port: 8080,
            file_system: '/var/www/',
            memory: {
                'index.html': {
                    'type': 'text/html',
                    'content': '<html><head><script src="index.js"></script></head><body>' +
                        '<p>Hello from in memory HTML!</p>' +
                        '<br><button onclick="hello()"> Run client side JavaScript</button>' +
                        '<br><br><button onclick="\'index.njs\', \'_top\')"> Run server side JavaScript</button>' +
                        '<br><br><button onclick="\'index.txt\', \'_top\')"> Go to a simple text</button>' +
                        '<br><p align="right"> <small>Espruino WebServer</small> </p>' +
                'index.txt': {
                    'content': 'Hello from in memory text!'
                'index.js': {
                    'type': 'application/javascript',
                    'content': "function hello(){ alert('Hello from in memory client side javascript'); }",
                'index.njs': {
                    'content': index_njs
                'favicon.ico': {
                    'type': 'image/x-icon',
                    'content': "\0\0\x01\0\x01\0\x10\x10\x10\0\x01\0\x0­4\x00\xf0\0\0\0\x16\0\0\x00\x89PNG\x0d\x­0a\x1a\x0a\0\0\0\x0dIHDR\0\0\0\x10\0\0\0­\x10\x08\x06\0\0\0\x1f\xf3\xffa\0\0\x00\­xb7IDAT8\x8d\xa5S\xc1\x0d\x03!\x0csN\xb7­\x91w\xcaP\xde)3\xd1G\x09\x0a\x85\xab\xa­8\xea\x0f\x02\x82c\x1b0\x92x\x82\xbb\xb7­:\x8f\x08D\x84\xd5\xb5\x1b\x00H\xb6>N\x0­4uN\x12\x92\x10\x11S\xcd]\x0b\xbf\xa9\xe­9\x8a\x00\xa0I\x1a*\x06A\x97\xb7\x90\xd4­\x8e$A\x12\xee\xde\xb2vR\x90$\xc8q\xf6\x­03\xbc\x15Ldw]\x88zpc\xab*\x8c\x08H\xb2A­\x90\x1e\x97\xce\x1bd3\x00\xb8v\x9b\xa7p­\xf7\xb6\x10\x9cb\xc9\xe0Wd\x06\x17\x80v­\xe2\xfb\x09\x17\x00H\xfa\x8b\xc0\xba\x9­c\xe3CU\xf1\xc8@\xd2\x08fW\xf8i3?U\x12\x­18z\x16\xf5A\x9ddc_\xee\xbd~e{*z\x01|\xc­dnfT\x03\x0an\0\0\0\x00IEND\xaeB`\x82"
        webs.on('start', function (WebServer) {
            console.log('WebServer listening on port ' + WebServer.port);
        webs.on('request', function (request, response, parsedUrl, WebServer) {
            console.log('WebServer requested', parsedUrl);
        webs.on('error', function (error, WebServer) {
            console.log('WebServer error', error);
    function index_njs(req, res, uri, webs) {
        return {
            type: 'text/html',
            content: '<html>' +
                '<p>Hello from in memory server side javascript!</p>' +
                '<p><b>Espruino Memory Usage: </b><br>' + JSON.stringify(process.memory()) + '</p>' +
                '<p><b>Espruino Flash Usage: </b><br>' + JSON.stringify(require('Flash').getFree(­)) + '</p>' +
    // setInterval(function () {
    //     eth.getIP();
    //     startServer();
    // }, 5000);

    1 Attachment

    • 微信图片_20200929142650.png
  • What device are you running this on? The W5500 has an actual reset pin that could be toggled so that could help?

  • Running out of sockets on the device site, is mostly caused by missing .end() or not handling all calls.

    Give curl a try to see the difference.

    curl -V <web-server-ip>/index.njs

    Feel free to share your code to reproduce it, got some Wiz5500 on my desk.

  • Yes, the reset pin can help this issue. Or restart the power of the device can also reset the W5500. But this issue will happen in a few minute again.

  • Post a reply
    • Bold
    • Italics
    • Link
    • Image
    • List
    • Quote
    • code
    • Preview

How to reset WIZnet 5500 while socket is not available?

Posted by Avatar for user109783 @user109783