add otaflash.py script to release files

.build.yml

@@ -57,6 +57,7 @@ steps:
     base_url: https://git.neulandlabor.de/
     files: 
       - firmware/firmware/fiatlux.bin
+      - firmware/otaflash.py
       - pcb/pcb.zip
     checksum:
       - sha512

README.md

@@ -27,6 +27,7 @@ git submodule update --init --recursive
  - ncurses-dev libexpat-dev
  - python3 python3-serial python-dev
    
+ - pip install websocket-client (for otaflash.py, optional)
 
 ### Build Steps
 

firmware/.idea/firmware.iml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module version="4">
+  <component name="FacetManager">
+    <facet type="Python" name="Python facet">
+      <configuration sdkName="Python 3.9" />
+    </facet>
+  </component>
+</module>

firmware/Makefile

@@ -2,7 +2,7 @@ PROGRAM=fiatlux
 
 EXTRA_CFLAGS=-O3 -Ifsdata
 
-EXTRA_COMPONENTS=extras/i2s_dma extras/ws2812_i2s extras/dhcpserver extras/mbedtls extras/httpd extras/sntp extras/cpp_support
+EXTRA_COMPONENTS=extras/i2s_dma extras/ws2812_i2s extras/dhcpserver extras/rboot-ota extras/mbedtls extras/httpd extras/sntp extras/cpp_support
 
 LIBS = hal m
 
@@ -10,7 +10,9 @@ FLASH_MODE = dio
 
 include ../modules/rtos/common.mk
 
-html:
+html: fsdata/fsdata.c
+
+fsdata/fsdata.c: fsdata/fs/index.html fsdata/fs/404.html fsdata/fs/css/picnic.min.css fsdata/fs/css/style.css fsdata/fs/js/smoothie_min.js
 	@echo "Generating fsdata.."
 	cd fsdata && ./makefsdata
 

firmware/crc32.c

@@ -0,0 +1,71 @@
+//
+// Created by jedi on 02.08.21.
+//
+
+#include "crc32.h"
+
+#define UPDC32(octet, crc) (crc_32_tab[((crc)\
+^ ((uint8_t)octet)) & 0xff] ^ ((crc) >> 8))
+
+static uint32_t crc_32_tab[] = { /* CRC polynomial 0xedb88320 */
+        0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+        0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+        0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+        0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+        0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+        0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+        0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+        0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+        0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+        0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+        0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+        0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+        0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+        0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+        0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+        0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+        0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+        0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+        0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+        0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+        0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+        0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+        0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+        0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+        0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+        0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+        0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+        0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+        0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+        0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+        0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+        0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+        0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+        0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+        0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+        0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+        0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+        0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+        0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+        0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+        0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+        0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+        0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+uint32_t updateCRC32(uint8_t ch, uint32_t crc) {
+    return UPDC32(ch, crc);
+}
+
+uint32_t crc32_partial(uint32_t init, uint8_t *buf, uint32_t len) {
+    register uint32_t oldcrc32;
+    oldcrc32 = ~init;
+    for (; len; --len, ++buf) {
+        oldcrc32 = UPDC32(*buf, oldcrc32);
+    }
+    return ~oldcrc32;
+}
+
+uint32_t crc32(uint8_t *data, uint32_t len) {
+    return crc32_partial(0, data, len);
+}

firmware/crc32.h

@@ -0,0 +1,14 @@
+//
+// Created by jedi on 02.08.21.
+//
+
+#ifndef FIRMWARE_CRC32_H
+#define FIRMWARE_CRC32_H
+
+#include <stdint.h>
+
+uint32_t crc32_partial(uint32_t init, uint8_t *data, uint32_t len);
+
+uint32_t crc32(uint8_t *data, uint32_t len);
+
+#endif //FIRMWARE_CRC32_H

firmware/fiatlux.c

@@ -22,9 +22,9 @@ void user_init(void)
 
     wifi_available_semaphore = xSemaphoreCreateBinary();
 
-    xTaskCreate(wifi_task, "wifi_task", 512, NULL, 2, NULL);
+    xTaskCreate(wifi_task, "wifi_task", 1024, NULL, 1, NULL);
 
-    xTaskCreate(&httpd_task, "httpd_task", 512, NULL, 2, NULL);
+    xTaskCreate(&httpd_task, "httpd_task", 1024, NULL, 2, NULL);
 
     xTaskCreate(&lux_task, "lux_task", 512, NULL, 1, NULL);
 }

firmware/fsdata/fs/css/style.css

@@ -5,28 +5,17 @@ main {
 	margin-left: auto;
 	margin-right: auto;
 }
-section {
-	display: none;
-}
 
 canvas{
 	width: 100%;
 }
 
-main[data-page="dashboard"] section[id="dashboard"] {
-	display: block;
+main section:target ~ section, main section#io, main section#wifi,  main section#ota  {
+	display: none;
 }
 
-main[data-page="ota"] section[id="ota"] {
-	display: block;
-}
-
-main[data-page="wifi"] section[id="wifi"] {
-	display: block;
-}
-
-main[data-page="io"] section[id="io"] {
-	display: block;
+main section:target{
+	display: block !important;
 }
 
 .table {

firmware/fsdata/fs/index.html

@@ -12,8 +12,52 @@
         <span>fiatlux v0.2</span>
         <span class="label warning" id="status_box">Loading...</span>
     </a>
+    <input id="bmenub" type="checkbox" class="show">
+    <label for="bmenub" class="burger pseudo button">&#9776;</label>
+    <div class="menu">
+        <a href="/#" class="button icon-picture">Dashboard</a>
+        <a href="/#ota" class="button icon-picture">System</a>
+    </div>
 </nav>
-<main data-page="dashboard" id="page">
+<main id="page">
+    <section id="ota">
+        <h2>System</h2>
+        <article class="card">
+            <header>
+                <h3>Firmware Update</h3>
+            </header>
+            <div class="table">
+                <div class="row">
+                    <span><input id="firmware_file" type="file" onchange="load_firmware(event)"/></span>
+                </div>
+                <div class="row">
+                    <span><input id="transmit_firmware" disabled type="submit" value="Upload"
+                                 onclick="transmit_firmware(event)"></span>
+                </div>
+            </div>
+        </article>
+        <article class="card">
+            <header>
+                <h3>Restart</h3>
+            </header>
+            <div class="table">
+                <div class="row">
+                    <span><input type="submit" value="Restart" onclick="wsWrite('R')"></span>
+                </div>
+            </div>
+        </article>
+        <article class="card">
+            <header>
+                <h3>Reset Config</h3>
+            </header>
+            <div class="table">
+                <div class="row">
+                    <span><input type="submit" class="warning" value="Reset" onclick="wsWrite('X')"></span>
+                </div>
+            </div>
+        </article>
+
+    </section>
     <section id="dashboard">
         <h2>Status</h2>
         <div class="flex">
@@ -169,6 +213,9 @@
         chart.streamTo(canvas, 500);
     }
 
+    var receive_chunk_confirmation = () => {
+    };
+
     function onMessage(evt) {
         retries = 0;
         if (typeof evt.data == 'string') {
@@ -190,7 +237,9 @@
 
             if (cmd === 'G')
                 console.log("LED switched", val);
-            else if (cmd === 'V') {
+            else if (cmd === 'F') {
+                receive_chunk_confirmation(dv);
+            } else if (cmd === 'V') {
                 voltage.innerHTML = (val * 13 / 1024).toFixed(2);
                 series.append(new Date().getTime(), val);
             } else
@@ -227,7 +276,7 @@
     }
 
     function wsWrite(data) {
-        console.info(buf2hex(data));
+        //console.info(buf2hex(data));
         if (ws.readyState === 3 || retries++ > 5)
             wsOpen();
         else if (ws.readyState === 1)
@@ -246,6 +295,105 @@
         startPolling();
     }
 
+    var makeCRCTable = function () {
+        var c;
+        var crcTable = [];
+        for (var n = 0; n < 256; n++) {
+            c = n;
+            for (var k = 0; k < 8; k++) {
+                c = ((c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
+            }
+            crcTable[n] = c;
+        }
+        return crcTable;
+    }
+
+    var crc32 = function (buf) {
+        const bufview = new DataView(buf);
+        var crcTable = window.crcTable || (window.crcTable = makeCRCTable());
+        var crc = 0 ^ (-1);
+
+        for (var i = 0; i < bufview.byteLength; i++) {
+            crc = (crc >>> 8) ^ crcTable[(crc ^ bufview.getInt8(i)) & 0xFF];
+        }
+
+        return (crc ^ (-1)) >>> 0;
+    };
+
+    var firmware_file;
+
+    function load_firmware(evt) {
+        var file = evt.target.files[0];
+        if (!file) {
+            return;
+        }
+        var reader = new FileReader();
+        reader.onload = function (e) {
+            firmware_file = e.target.result;
+            document.getElementById("transmit_firmware").disabled = false;
+        };
+        reader.readAsArrayBuffer(file)
+    }
+
+    const chunk_size = 512;
+
+    function transmit_firmware_chunk(buf, i) {
+        return new Promise((resolve, reject) => {
+            const begin = i * chunk_size;
+            const end = Math.min((i + 1) * chunk_size, buf.byteLength);
+            const slice = buf.slice(begin, end)
+            var header = new ArrayBuffer(12);
+            var headerview = new DataView(header);
+            headerview.setChar(0, 'F');
+            headerview.setInt16(4, i);
+            headerview.setInt16(6, (end - begin));
+            headerview.setInt32(8, crc32(slice));
+            var frame = new Uint8Array(12 + slice.byteLength);
+            frame.set(new Uint8Array(header), 0);
+            frame.set(new Uint8Array(slice), 12);
+            receive_chunk_confirmation = (dv) => {
+                setTimeout(() => {
+                    resolve(i);
+                }, 50);
+            }
+            setTimeout(() => {
+                reject(i);
+            }, 2000);
+            wsWrite(frame.buffer);
+        });
+    }
+
+    function transmit_firmware_final(buf, hash) {
+        return new Promise((resolve, reject) => {
+            var frame = new ArrayBuffer(12);
+            var headerview = new DataView(frame);
+            headerview.setChar(0, 'C');
+            headerview.setInt32(4, buf.byteLength);
+            headerview.setInt32(8, hash);
+            receive_chunk_confirmation = (dv) => {
+                resolve(i);
+            }
+            setTimeout(() => {
+                reject(i);
+            }, 500);
+            wsWrite(frame);
+        });
+    }
+
+    function transmit_firmware(evt) {
+        console.log("transmit_firmware begin");
+        if (firmware_file) {
+            (async () => {
+                const ash = crc32(firmware_file);
+                for (var i = 0; i * chunk_size < firmware_file.byteLength; i++) {
+                    await transmit_firmware_chunk(firmware_file, i);
+                }
+                await transmit_firmware_final(firmware_file, crc32(firmware_file));
+            })().then(() => {
+                console.log("transmit_firmware done");
+            })
+        }
+    }
 </script>
 </body>
 </html>

firmware/otaflash.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+
+import time
+import websocket
+import argparse
+import zlib
+
+parser = argparse.ArgumentParser(description='Update fiatlux firmware via websocket.')
+parser.add_argument("binfile")
+
+args = parser.parse_args()
+
+with open(args.binfile, "rb") as f:
+    try:
+        ws = websocket.WebSocket()
+        ws.connect("ws://172.16.0.1")
+        i = 0
+        rolling = 0
+        total = 0
+        while True:
+            bytes = f.read(512)
+            rolling = zlib.crc32(bytes, rolling)
+            total += len(bytes)
+            msg = b'F\x00\x00\x00'
+            msg += i.to_bytes(2, 'big')
+            msg += len(bytes).to_bytes(2, 'big')
+            msg += (zlib.crc32(bytes) & 0xffffffff).to_bytes(4, 'big')
+            msg += bytes
+            ws.send(msg)
+            reply = ws.recv()
+            time.sleep(0.05)
+            i += 1
+            if len(bytes) != 512:
+                break
+        msg = b'C\x00\x00\x00'
+        msg += total.to_bytes(4, 'big')
+        msg += rolling.to_bytes(4, 'big')
+        ws.send(msg)
+        print(ws.recv())
+        ws.close()
+    except ConnectionResetError:
+        pass
+    except KeyboardInterrupt:
+        pass

firmware/system.c

@@ -3,35 +3,114 @@
 //
 
 #include "system.h"
+#include "crc32.h"
 
 #include <FreeRTOS.h>
-#include <task.h>
 #include <sysparam.h>
 #include <spiflash.h>
 
-#include <espressif/esp_common.h>
 #include <espressif/user_interface.h>
+#include <espressif/esp_system.h>
+#include <rboot/rboot.h>
+#include <rboot-ota/rboot-api.h>
+#include <string.h>
+
+#define min(a, b) \
+ ({ __typeof__ (a) _a = (a); \
+ __typeof__ (b) _b = (b); \
+ _a < _b ? _a : _b; })
 
 void system_clear_config() {
     vPortEnterCritical();
-    uint32_t num_sectors = 5 + DEFAULT_SYSPARAM_SECTORS;
-    uint32_t start = sdk_flashchip.chip_size - num_sectors * sdk_flashchip.sector_size;
+    uint32_t num_sectors = 0x2000 / sdk_flashchip.sector_size;
+    uint32_t start = 0x00100000;
     for (uint32_t i = 0; i < num_sectors; i++) {
         spiflash_erase_sector(start + i * sdk_flashchip.sector_size);
     }
+    if(sysparam_create_area(start, num_sectors, true) == SYSPARAM_OK) {
+        sysparam_init(start, 0);
+    }
+    sysparam_init(start, start + 0x2000);
     sdk_system_restart();
 }
 
 void system_init_config() {
-    uint32_t base_addr;
+    uint32_t base_addr = 0x00100000;
     uint32_t num_sectors;
+    sysparam_init(base_addr, 0);
     if(sysparam_get_info(&base_addr, &num_sectors) != SYSPARAM_OK) {
         printf("Warning: WiFi config, sysparam not initialized\n");
-        num_sectors = DEFAULT_SYSPARAM_SECTORS;
-        base_addr = sdk_flashchip.chip_size - (5 + num_sectors) * sdk_flashchip.sector_size;
+        num_sectors = 0x2000 / sdk_flashchip.sector_size;
         if(sysparam_create_area(base_addr, num_sectors, true) == SYSPARAM_OK) {
             sysparam_init(base_addr, 0);
         }
         sdk_system_restart();
     }
 }
+
+#define MAX_IMAGE_SIZE 0x100000
+
+struct {
+    rboot_write_status status;
+    uint32_t head;
+    uint32_t base;
+    uint16_t seq;
+    uint8_t slot;
+} otaflash_context;
+
+void system_otaflash_init() {
+    rboot_config conf;
+    conf = rboot_get_config();
+    otaflash_context.slot = (conf.current_rom + 1) % conf.count;
+    otaflash_context.base = rboot_get_slot_offset(otaflash_context.slot);
+    otaflash_context.status = rboot_write_init(otaflash_context.base);
+    otaflash_context.head = otaflash_context.base;
+    otaflash_context.seq = 0;
+}
+
+int system_otaflash_chunk(uint8_t *data, uint16_t len, uint16_t seq, uint32_t hash) {
+    uint32_t local_hash = crc32(data, len);
+    if(hash == local_hash && otaflash_context.seq == seq) {
+        if(otaflash_context.head % SECTOR_SIZE == 0) {
+            sdk_spi_flash_erase_sector(otaflash_context.head / SECTOR_SIZE);
+        }
+        if(((uint32_t) data) % 4) {
+            uint32 buf[len / 4];
+            memcpy(buf, data, len);
+            sdk_spi_flash_write(otaflash_context.head, buf, len);
+        } else {
+            sdk_spi_flash_write(otaflash_context.head, (uint32_t *) data, len);
+        }
+        otaflash_context.head += len;
+        otaflash_context.seq++;
+        return 0x88;
+    } else {
+        return 0xff;
+    }
+
+}
+
+void system_otaflash_verify_chunk(void *ctx, void *data, size_t len) {
+    uint32_t digest = *(uint32_t *) ctx;
+    digest = crc32_partial(digest, data, len);
+    *(uint32_t *) ctx = digest;
+}
+
+int system_otaflash_verify_and_switch(uint32_t len, uint32_t hash) {
+
+    uint32_t digest = 0;
+    rboot_digest_image(otaflash_context.base, min(len, MAX_IMAGE_SIZE), system_otaflash_verify_chunk, &digest);
+
+    if(hash != digest) {
+        printf("OTA failed to verify firmware\r\n");
+        return 0x99;
+    }
+
+    vPortEnterCritical();
+    if(!rboot_set_current_rom(otaflash_context.slot)) {
+        printf("OTA failed to set new rboot slot\r\n");
+    }
+    sdk_system_restart();
+    vPortExitCritical(); // | should not be reached
+    return 0x77;         // |
+}

firmware/system.h

@@ -5,13 +5,22 @@
 #ifndef FIRMWARE_SYSTEM_H
 #define FIRMWARE_SYSTEM_H
 
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 void system_clear_config();
+
 void system_init_config();
 
+void system_otaflash_init();
+
+int system_otaflash_chunk(uint8_t *data, uint16_t len, uint16_t seq, uint32_t hash);
+
+int system_otaflash_verify_and_switch(uint32_t len, uint32_t hash);
+
 #ifdef __cplusplus
 }
 #endif

firmware/web.cpp

@@ -38,7 +38,7 @@ void websocket_task(void *pvParameter) {
     has_changed = {true, true, true};
 
     for (;;) {
-        if(pcb == NULL || pcb->state != ESTABLISHED) {
+        if(pcb == nullptr || pcb->state != ESTABLISHED) {
             printf("Connection closed, deleting task\n");
             break;
         }
@@ -46,14 +46,14 @@ void websocket_task(void *pvParameter) {
         //Global Info
         if(has_changed.global) {
             has_changed.global = false;
-            timeval tv;
-            gettimeofday(&tv, NULL);
-            int uptime = xTaskGetTickCount() * portTICK_PERIOD_MS / 1000;
+            timeval tv{};
+            gettimeofday(&tv, nullptr);
+            size_t uptime = xTaskGetTickCount() * portTICK_PERIOD_MS / 1000;
             int heap = (int) xPortGetFreeHeapSize();
             uint32_t chip_id = sdk_system_get_chip_id();
             uint32_t flash_id = sdk_spi_flash_get_id();
             uint32_t flash_size = sdk_flashchip.chip_size >> 10;
-            char *hostname = NULL;
+            char *hostname = nullptr;
 
             sysparam_get_string("hostname", &hostname);
             /* Generate response in JSON format */
@@ -80,21 +80,16 @@ void websocket_task(void *pvParameter) {
         //Connection Info
         if(has_changed.connection) {
             has_changed.connection = false;
-            timeval tv;
-            gettimeofday(&tv, NULL);
-            int connuptime = (xTaskGetTickCount() - connstarttime) * portTICK_PERIOD_MS / 1000;
+            timeval tv{};
+            gettimeofday(&tv, nullptr);
+            size_t connuptime = (xTaskGetTickCount() - connstarttime) * portTICK_PERIOD_MS / 1000;
 
-            printf("conn %d: "
-                   IPSTR
-                   " <-> "
-                   IPSTR
-                   " \n", pcb->netif_idx, IP2STR(&pcb->local_ip), IP2STR(&pcb->remote_ip));
+            printf("conn %d: " IPSTR " <-> " IPSTR " \n", pcb->netif_idx, IP2STR(&pcb->local_ip),
+                   IP2STR(&pcb->remote_ip));
             char response[160];
             size_t len = snprintf(response, sizeof(response),
                                   "{\"connage\" : \"%d\","
-                                  "\"clientip\" : \""
-                                  IPSTR
-                                  "\""
+                                  "\"clientip\" : \"" IPSTR "\""
                                   "}", connuptime, IP2STR(&pcb->remote_ip));
             if(len < sizeof(response)) {
                 LOCK_TCPIP_CORE();
@@ -137,10 +132,10 @@ void websocket_task(void *pvParameter) {
             if(opmode == SOFTAP_MODE || opmode == STATIONAP_MODE) {
                 uint8_t hwaddr[6];
                 sdk_wifi_get_macaddr(SOFTAP_IF, hwaddr);
-                ip_info info;
+                ip_info info{};
                 sdk_wifi_get_ip_info(SOFTAP_IF, &info);
 
-                char *apssid = NULL;
+                char *apssid = nullptr;
                 sysparam_get_string("wifi_ap_ssid", &apssid);
 
                 /* Generate response in JSON format */
@@ -148,12 +143,8 @@ void websocket_task(void *pvParameter) {
                 size_t len = snprintf(response, sizeof(response),
                                       "{\"opmode\" : \"%s\","
                                       " \"apssid\" : \"%s\","
-                                      " \"apip\" : \""
-                                      IPSTR
-                                      "\","
-                                      " \"apmac\" : \""
-                                      MACSTR
-                                      "\""
+                                      " \"apip\" : \"" IPSTR "\","
+                                      " \"apmac\" : \"" MACSTR "\""
                                       "}", opmode_str, apssid, IP2STR(&info.ip), MAC2STR(hwaddr));
                 free(apssid);
                 if(len < sizeof(response)) {
@@ -169,7 +160,7 @@ void websocket_task(void *pvParameter) {
             if(opmode == STATION_MODE || opmode == STATIONAP_MODE) {
                 uint8_t hwaddr[6];
                 sdk_wifi_get_macaddr(STATION_IF, hwaddr);
-                ip_info info;
+                ip_info info{};
                 sdk_wifi_get_ip_info(STATION_IF, &info);
                 char *stassid = nullptr;
                 sysparam_get_string("wifi_sta_ssid", &stassid);
@@ -179,12 +170,8 @@ void websocket_task(void *pvParameter) {
                 size_t len = snprintf(response, sizeof(response),
                                       "{\"opmode\" : \"%s\","
                                       " \"stassid\" : \"%s\","
-                                      " \"staip\" : \""
-                                      IPSTR
-                                      "\","
-                                      " \"stamac\" : \""
-                                      MACSTR
-                                      "\""
+                                      " \"staip\" : \"" IPSTR "\","
+                                      " \"stamac\" : \"" MACSTR "\""
                                       "}", opmode_str, stassid, IP2STR(&info.ip), MAC2STR(hwaddr));
                 free(stassid);
                 if(len < sizeof(response)) {
@@ -198,34 +185,49 @@ void websocket_task(void *pvParameter) {
         }
 
         vTaskDelayMs(500);
-        {
-            uint8_t response[3];
-            uint16_t val = 0;
-            val = sdk_system_adc_read();
-            response[2] = (uint8_t) val;
-            response[1] = val >> 8;
-            response[0] = 'V';
-            websocket_write(pcb, response, 3, WS_BIN_MODE);
-        }
-        vTaskDelayMs(500);
     }
 
-    vTaskDelete(NULL);
+    vTaskDelete(nullptr);
 }
 
+struct fw_frame {
+    char t;
+    uint8_t reserved[3];
+    uint16_t seq;
+    uint16_t len;
+    uint32_t hash;
+    uint8_t data[];
+} __attribute__((packed));
+
+struct fw_check {
+    char t;
+    uint8_t reserved[3];
+    uint32_t len;
+    uint32_t hash;
+} __attribute__((packed));
+
 /**
  * This function is called when websocket frame is received.
  *
  * Note: this function is executed on TCP thread and should return as soon
  * as possible.
  */
-void websocket_cb(struct tcp_pcb *pcb, char *data, u16_t data_len, uint8_t mode) {
+void websocket_cb(struct tcp_pcb *pcb, char *data, u16_t data_len,
+                  uint8_t /*mode*/) { //mode should be WS_BIN_MODE or WS_TEXT_MODE
 
     uint8_t response[3];
     uint16_t val = 0;
     char cmd = '0';
 
+    bool togl = 0;
+
     switch (data[0]) {
+        case 'R': // Restart
+            cmd = 'R';
+            break;
+        case 'X': // Clear Config
+            cmd = 'X';
+            break;
         case 'D': // Disable LED
             signal_led(false);
             val = 1;
@@ -236,9 +238,29 @@ void websocket_cb(struct tcp_pcb *pcb, char *data, u16_t data_len, uint8_t mode)
             val = 0;
             cmd = 'G';
             break;
+        case 'F':
+            togl = ~togl;
+            signal_led(togl);
+            {
+                auto *f = (fw_frame *) data;
+                if(f->seq == 0) {
+                    system_otaflash_init();
+                }
+                val = system_otaflash_chunk(f->data, ntohs(f->len), ntohs(f->seq), ntohl(f->hash));
+            }
+            cmd = 'F';
+            break;
+        case 'C':
+            signal_led(false);
+            {
+                auto *f = (fw_check *) data;
+                val = system_otaflash_verify_and_switch(ntohl(f->len), ntohl(f->hash));
+            }
+            cmd = 'C';
+            break;
         default:
             printf("[websocket_callback]:\n%.*s\n", (int) data_len, (char *) data);
-            printf("Unknown command\n");
+            printf("Unknown command %c\n", data[0]);
             val = 0;
             break;
     }
@@ -247,7 +269,18 @@ void websocket_cb(struct tcp_pcb *pcb, char *data, u16_t data_len, uint8_t mode)
     response[1] = val >> 8;
     response[0] = cmd;
 
+    LOCK_TCPIP_CORE();
     websocket_write(pcb, response, 3, WS_BIN_MODE);
+    UNLOCK_TCPIP_CORE();
+
+    if(data[0] == 'R') { // Restart
+        vTaskDelay(500 / portTICK_PERIOD_MS);
+        vPortEnterCritical();
+        sdk_system_restart();
+    } else if(data[0] == 'X') { // Clear Config
+        vTaskDelay(500 / portTICK_PERIOD_MS);
+        system_clear_config();
+    }
 }
 
 /**
@@ -262,10 +295,10 @@ void websocket_open_cb(struct tcp_pcb *pcb, const char *uri) {
 }
 
 extern "C" void httpd_task(void *pvParameters) {
+    (void) pvParameters;
 
     while (!uxSemaphoreGetCount(wifi_available_semaphore))
         vTaskDelay(500 / portTICK_PERIOD_MS);
-
     websocket_register_callbacks((tWsOpenHandler) websocket_open_cb, (tWsHandler) websocket_cb);
     httpd_init();