esp8266 relay controller wip

18 files changed, 1379 insertions, 0 deletions

diff --git a/platformio/relayctl/src/config.cpp b/platformio/relayctl/src/config.cpp
new file mode 100644
index 0000000..d143a7f
--- /dev/null
+++ b/platformio/relayctl/src/config.cpp
@@ -0,0 +1,88 @@
+#include <EEPROM.h>
+#include <strings.h>
+#include "config.h"
+#include "config.def.h"
+#include "logging.h"
+
+#define GET_DATA_CRC(data) \
+    eeprom_crc(reinterpret_cast<uint8_t*>(&(data))+4, sizeof(ConfigData)-4)
+
+namespace homekit::config {
+
+static const uint32_t magic = 0xdeadbeef;
+static const uint32_t crc_table[16] = {
+        0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
+        0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
+        0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
+        0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
+};
+
+static uint32_t eeprom_crc(const uint8_t* data, size_t len) {
+    uint32_t crc = ~0L;
+    for (size_t index = 0; index < len; index++) {
+        crc = crc_table[(crc ^ data[index]) & 0x0f] ^ (crc >> 4);
+        crc = crc_table[(crc ^ (data[index] >> 4)) & 0x0f] ^ (crc >> 4);
+        crc = ~crc;
+    }
+    return crc;
+}
+
+ConfigData read() {
+    ConfigData data {0};
+    EEPROM.begin(sizeof(ConfigData));
+    EEPROM.get(0, data);
+    EEPROM.end();
+#ifdef DEBUG
+    if (!isValid(data)) {
+        PRINTLN("config::read(): data is not valid!");
+    }
+#endif
+    return data;
+}
+
+bool write(ConfigData& data) {
+    EEPROM.begin(sizeof(ConfigData));
+    data.magic = magic;
+    data.crc = GET_DATA_CRC(data);
+    EEPROM.put(0, data);
+    return EEPROM.end();
+}
+
+bool erase() {
+    ConfigData data;
+    return erase(data);
+}
+
+bool erase(ConfigData& data) {
+    bzero(reinterpret_cast<uint8_t*>(&data), sizeof(data));
+    data.magic = magic;
+    EEPROM.begin(sizeof(data));
+    EEPROM.put(0, data);
+    return EEPROM.end();
+}
+
+bool isValid(ConfigData& data) {
+    return data.crc == GET_DATA_CRC(data);
+}
+
+bool isDirty(ConfigData& data) {
+    return data.magic != magic;
+}
+
+char* ConfigData::escapeNodeId(char* buf, size_t len) {
+    if (len < 32)
+        return nullptr;
+    size_t id_len = strlen(node_id);
+    char* c = node_id;
+    char* dst = buf;
+    for (size_t i = 0; i < id_len; i++) {
+        if (*c == '"')
+            *(dst++) = '\\';
+        *(dst++) = *c;
+        c++;
+    }
+    *dst = '\0';
+    return buf;
+}
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/config.def.h.example b/platformio/relayctl/src/config.def.h.example
new file mode 100644
index 0000000..13ddd46
--- /dev/null
+++ b/platformio/relayctl/src/config.def.h.example
@@ -0,0 +1,32 @@
+#pragma once
+
+#define FW_VERSION 3
+
+#define DEFAULT_WIFI_AP_SSID ""
+#define DEFAULT_WIFI_STA_SSID ""
+#define DEFAULT_WIFI_STA_PSK  ""
+
+#define DEFAULT_MQTT_SERVER "mqtt.solarmon.ru"
+#define DEFAULT_MQTT_PORT 8883
+#define DEFAULT_MQTT_USERNAME ""
+#define DEFAULT_MQTT_PASSWORD ""
+#define DEFAULT_MQTT_CLIENT_ID ""
+#define DEFAULT_MQTT_CA_FINGERPRINT { \
+    0x0e, 0xb6, 0x3a, 0x02, 0x1f,     \
+    0x4e, 0x1e, 0xe1, 0x6a, 0x67,     \
+    0x62, 0xec, 0x64, 0xd4, 0x84,     \
+    0x8a, 0xb0, 0xc9, 0x9c, 0xbb      \
+};
+
+#define DEFAULT_NODE_ID "relay-node"
+
+#define FLASH_BUTTON_PIN 0
+#define ESP_LED_PIN 2
+#define BOARD_LED_PIN 16
+
+// 12 bytes string
+#define SECRET ""
+
+#define DEBUG
+
+#define ARRAY_SIZE(X) sizeof((X))/sizeof((X)[0])
\ No newline at end of file
diff --git a/platformio/relayctl/src/config.h b/platformio/relayctl/src/config.h
new file mode 100644
index 0000000..58a5f25
--- /dev/null
+++ b/platformio/relayctl/src/config.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <Arduino.h>
+
+namespace homekit::config {
+
+struct ConfigFlags {
+    uint8_t wifi_configured: 1;
+    uint8_t node_configured: 1;
+    uint8_t reserved: 6;
+} __attribute__((packed));
+
+struct ConfigData {
+    // helpers
+    uint32_t crc = 0;
+    uint32_t magic = 0;
+    char node_id[16] = {0};
+    char wifi_ssid[32] = {0};
+    char wifi_psk[63] = {0};
+    ConfigFlags flags {0};
+
+    // helper methods
+    char* escapeNodeId(char* buf, size_t len);
+} __attribute__((packed));
+
+
+ConfigData read();
+bool write(ConfigData& data);
+bool erase();
+bool erase(ConfigData& data);
+bool isValid(ConfigData& data);
+bool isDirty(ConfigData& data);
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/http_server.cpp b/platformio/relayctl/src/http_server.cpp
new file mode 100644
index 0000000..0899231
--- /dev/null
+++ b/platformio/relayctl/src/http_server.cpp
@@ -0,0 +1,249 @@
+#include <Arduino.h>
+#include <string.h>
+
+#include "http_server.h"
+#include "config.h"
+#include "wifi.h"
+#include "config.def.h"
+#include "logging.h"
+
+namespace homekit {
+
+static const char CONTENT_TYPE_HTML[] = "text/html; charset=utf-8";
+static const char CONTENT_TYPE_CSS[] = "text/css";
+static const char CONTENT_TYPE_JS[] = "application/javascript";
+static const char CONTENT_TYPE_JSON[] = "application/json";
+static const char CONTENT_TYPE_FAVICON[] = "image/x-icon";
+
+static const char JSON_STATUS_FMT[] = "{\"node_id\":\"%s\""
+#ifdef DEBUG
+                                      ",\"configured\":%d"
+                                      ",\"crc\":%u"
+                                      ",\"fl_n\":%d"
+                                      ",\"fl_w\":%d"
+#endif
+                                      "}";
+static const size_t JSON_BUF_SIZE = 192;
+
+static const char NODE_ID_ERROR[] = "?";
+
+static const char FIELD_NODE_ID[] = "nid";
+static const char FIELD_SSID[] = "ssid";
+static const char FIELD_PSK[] = "psk";
+
+static const char MSG_IS_INVALID[] = " is invalid";
+static const char MSG_IS_MISSING[] = " is missing";
+
+static const char GZIP[] = "gzip";
+static const char CONTENT_ENCODING[] = "Content-Encoding";
+static const char NOT_FOUND[] = "Not Found";
+
+static void do_restart() {
+    ESP.restart();
+}
+
+void HttpServer::start() {
+    _server.on("/style.css", HTTP_GET, [](AsyncWebServerRequest* req) { sendGzip(req, files::style_css, CONTENT_TYPE_CSS); });
+    _server.on("/app.js", HTTP_GET, [](AsyncWebServerRequest* req) { sendGzip(req, files::app_js, CONTENT_TYPE_JS); });
+    _server.on("/favicon.ico", HTTP_GET, [](AsyncWebServerRequest* req) { sendGzip(req, files::favicon_ico, CONTENT_TYPE_FAVICON); });
+    _server.on("/", HTTP_GET, [&](AsyncWebServerRequest* req) { sendGzip(req, files::index_html, CONTENT_TYPE_HTML); });
+
+    _server.on("/status", HTTP_GET, [](AsyncWebServerRequest* req) {
+        char json_buf[JSON_BUF_SIZE];
+        auto cfg = config::read();
+        char *ssid, *psk;
+        wifi::getConfig(cfg, &ssid, &psk, nullptr);
+
+        if (!isValid(cfg) || !cfg.flags.node_configured) {
+            sprintf(json_buf, JSON_STATUS_FMT
+                    , DEFAULT_NODE_ID
+#ifdef DEBUG
+                    , 0
+                    , cfg.crc
+                    , cfg.flags.node_configured
+                    , cfg.flags.wifi_configured
+#endif
+            );
+        } else {
+            char escaped_node_id[32];
+            char *escaped_node_id_res = cfg.escapeNodeId(escaped_node_id, 32);
+            sprintf(json_buf, JSON_STATUS_FMT
+                    , escaped_node_id_res == nullptr ? NODE_ID_ERROR : escaped_node_id
+#ifdef DEBUG
+                    , 1
+                    , cfg.crc
+                    , cfg.flags.node_configured
+                    , cfg.flags.wifi_configured
+#endif
+            );
+        }
+        req->send(200, CONTENT_TYPE_JSON, json_buf);
+    });
+
+    _server.on("/status", HTTP_POST, [&](AsyncWebServerRequest* req) {
+        auto cfg = config::read();
+        char *s;
+
+        if (!handleInputStr(req, FIELD_SSID, 32, &s)) return;
+        strncpy(cfg.wifi_ssid, s, 32);
+        PRINTF("saving ssid: %s\n", cfg.wifi_ssid);
+
+        if (!handleInputStr(req, FIELD_PSK, 63, &s)) return;
+        strncpy(cfg.wifi_psk, s, 63);
+        PRINTF("saving psk: %s\n", cfg.wifi_psk);
+
+        if (!handleInputStr(req, FIELD_NODE_ID, 16, &s)) return;
+        strcpy(cfg.node_id, s);
+        PRINTF("saving node id: %s\n", cfg.node_id);
+
+        cfg.flags.node_configured = 1;
+        cfg.flags.wifi_configured = 1;
+
+        if (!config::write(cfg)) {
+            PRINTLN("eeprom write error");
+            return sendError(req, "eeprom error");
+        }
+
+        restartTimer.once(0, do_restart);
+    });
+
+    _server.on("/reset", HTTP_POST, [&](AsyncWebServerRequest* req) {
+        config::erase();
+        restartTimer.once(0, do_restart);
+    });
+
+    _server.on("/heap", HTTP_GET, [](AsyncWebServerRequest* req) {
+       req->send(200, CONTENT_TYPE_HTML, String(ESP.getFreeHeap()));
+    });
+
+    _server.on("/scan", HTTP_GET, [&](AsyncWebServerRequest* req) {
+        int i = 0;
+        size_t len;
+        const char* ssid;
+        bool enough = false;
+
+        bzero(reinterpret_cast<uint8_t*>(buf1k), ARRAY_SIZE(buf1k));
+        char* cur = buf1k;
+
+        strncpy(cur, "{\"list\":[", ARRAY_SIZE(buf1k));
+        cur += 9;
+
+        for (auto& res: *_scanResults) {
+            ssid = res.ssid.c_str();
+            len = res.ssid.length();
+
+            // new item (array with 2 items)
+            *cur++ = '[';
+
+            // 1. ssid (string)
+            *cur++ = '"';
+            for (size_t j = 0; j < len; j++) {
+                if (*(ssid+j) == '"')
+                    *cur++ = '\\';
+                *cur++ = *(ssid+j);
+            }
+            *cur++ = '"';
+            *cur++ = ',';
+
+            // 2. rssi (number)
+            cur += sprintf(cur, "%d", res.rssi);
+
+            // close array
+            *cur++ = ']';
+
+            if (cur - buf1k >= ARRAY_SIZE(buf1k)-40)
+                enough = true;
+
+            if (i < _scanResults->size()-1 || enough)
+                *cur++ = ',';
+
+            if (enough)
+                break;
+
+            i++;
+        }
+
+        *cur++ = ']';
+        *cur++ = '}';
+        *cur++ = '\0';
+
+        req->send(200, CONTENT_TYPE_JSON, buf1k);
+    });
+
+    _server.on("/update", HTTP_POST, [&](AsyncWebServerRequest* req) {
+        char json_buf[16];
+        bool should_reboot = !Update.hasError();
+
+        sprintf(json_buf, "{\"result\":%d}", should_reboot ? 1 : 0);
+
+        auto resp = req->beginResponse(200, CONTENT_TYPE_JSON, json_buf);
+        req->send(resp);
+
+        if (should_reboot) restartTimer.once(1, do_restart);
+    }, [&](AsyncWebServerRequest *req, const String& filename, size_t index, uint8_t *data, size_t len, bool final) {
+        if (!index) {
+            PRINTF("update start: %s\n", filename.c_str());
+            Update.runAsync(true);
+            if (!Update.begin((ESP.getFreeSketchSpace() - 0x1000) & 0xFFFFF000))
+                Update.printError(Serial);
+        }
+
+        if (!Update.hasError() && len) {
+            if (Update.write(data, len) != len) {
+                Update.printError(Serial);
+            }
+        }
+
+        if (final) { // if the final flag is set then this is the last frame of data
+            if (Update.end(true)) {
+                PRINTF("update success: %uB\n", index+len);
+            } else {
+                Update.printError(Serial);
+            }
+        }
+    });
+
+    _server.onNotFound([](AsyncWebServerRequest* req) {
+        req->send(404, CONTENT_TYPE_HTML, NOT_FOUND);
+    });
+
+    _server.begin();
+}
+
+void HttpServer::sendGzip(AsyncWebServerRequest* req, StaticFile file, const char* content_type) {
+    auto resp = req->beginResponse_P(200, content_type, file.content, file.size);
+    resp->addHeader(CONTENT_ENCODING, GZIP);
+    req->send(resp);
+}
+
+void HttpServer::sendError(AsyncWebServerRequest* req, const String& message) {
+    char buf[32];
+    if (snprintf(buf, 32, "error: %s", message.c_str()) == 32)
+        buf[31] = '\0';
+    req->send(400, CONTENT_TYPE_HTML, buf);
+}
+
+bool HttpServer::handleInputStr(AsyncWebServerRequest *req,
+                                const char *field_name,
+                                size_t max_len,
+                                char **dst) {
+    const char* s;
+    size_t len;
+
+    if (!req->hasParam(field_name, true)) {
+        sendError(req, String(field_name) + String(MSG_IS_MISSING));
+        return false;
+    }
+
+    s = req->getParam(field_name, true)->value().c_str();
+    len = strlen(s);
+    if (!len || len > max_len) {
+        sendError(req, String(FIELD_NODE_ID) + String(MSG_IS_INVALID));
+        return false;
+    }
+
+    *dst = (char*)s;
+    return true;
+}
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/http_server.h b/platformio/relayctl/src/http_server.h
new file mode 100644
index 0000000..c7e3d9c
--- /dev/null
+++ b/platformio/relayctl/src/http_server.h
@@ -0,0 +1,37 @@
+#pragma once
+
+#include <memory>
+#include <list>
+#include <Ticker.h>
+#include <utility>
+#include <ESPAsyncWebServer.h>
+#include "static.h"
+#include "config.h"
+#include "wifi.h"
+
+namespace homekit {
+
+using files::StaticFile;
+
+class HttpServer {
+private:
+    AsyncWebServer _server;
+    Ticker restartTimer;
+    std::shared_ptr<std::list<wifi::ScanResult>> _scanResults;
+    char buf1k[1024];
+
+    static void sendGzip(AsyncWebServerRequest* req, StaticFile file, const char* content_type);
+    static void sendError(AsyncWebServerRequest* req, const String& message);
+
+    static bool handleInputStr(AsyncWebServerRequest* req, const char* field_name, size_t max_len, char** dst);
+    // static bool handle_input_addr(AsyncWebServerRequest* req, const char* field_name, ConfigIPv4Addr* addr_dst);
+
+public:
+    explicit HttpServer(std::shared_ptr<std::list<wifi::ScanResult>> scanResults)
+        : _server(80)
+        , _scanResults(std::move(scanResults)) {};
+
+    void start();
+};
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/led.cpp b/platformio/relayctl/src/led.cpp
new file mode 100644
index 0000000..eafc662
--- /dev/null
+++ b/platformio/relayctl/src/led.cpp
@@ -0,0 +1,20 @@
+#include "led.h"
+
+namespace homekit {
+
+void Led::blink(uint8_t count, uint16_t delay_ms) const {
+    for (uint8_t i = 0; i < count; i++) {
+        on_off(delay_ms, i < count-1);
+    }
+}
+
+void Led::on_off(uint16_t delay_ms, bool last_delay) const {
+    on();
+    delay(delay_ms);
+
+    off();
+    if (last_delay)
+        delay(delay_ms);
+}
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/led.h b/platformio/relayctl/src/led.h
new file mode 100644
index 0000000..ccb3f11
--- /dev/null
+++ b/platformio/relayctl/src/led.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <Arduino.h>
+
+namespace homekit {
+
+class Led {
+private:
+    uint8_t _pin;
+
+public:
+    explicit Led(uint8_t pin) : _pin(pin) {
+        pinMode(_pin, OUTPUT);
+        off();
+    }
+
+    inline void off() const { digitalWrite(_pin, HIGH); }
+    inline void on() const { digitalWrite(_pin, LOW); }
+
+    void on_off(uint16_t delay_ms, bool last_delay = false) const;
+    void blink(uint8_t count, uint16_t delay_ms) const;
+};
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/logging.cpp b/platformio/relayctl/src/logging.cpp
new file mode 100644
index 0000000..a929d81
--- /dev/null
+++ b/platformio/relayctl/src/logging.cpp
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include "logging.h"
+
+#ifdef DEBUG
+namespace homekit {
+
+void hexdump(const void* data, size_t size) {
+    char ascii[17];
+    size_t i, j;
+    ascii[16] = '\0';
+    for (i = 0; i < size; ++i) {
+        printf("%02X ", ((unsigned char*)data)[i]);
+        if (((unsigned char*)data)[i] >= ' ' && ((unsigned char*)data)[i] <= '~') {
+            ascii[i % 16] = ((unsigned char*)data)[i];
+        } else {
+            ascii[i % 16] = '.';
+        }
+        if ((i+1) % 8 == 0 || i+1 == size) {
+            printf(" ");
+            if ((i+1) % 16 == 0) {
+                printf("|  %s \n", ascii);
+            } else if (i+1 == size) {
+                ascii[(i+1) % 16] = '\0';
+                if ((i+1) % 16 <= 8) {
+                    printf(" ");
+                }
+                for (j = (i+1) % 16; j < 16; ++j) {
+                    printf("   ");
+                }
+                printf("|  %s \n", ascii);
+            }
+        }
+    }
+}
+
+}
+#endif
\ No newline at end of file
diff --git a/platformio/relayctl/src/logging.h b/platformio/relayctl/src/logging.h
new file mode 100644
index 0000000..c31e98f
--- /dev/null
+++ b/platformio/relayctl/src/logging.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stdlib.h>
+#include "config.def.h"
+
+#ifdef DEBUG
+
+namespace homekit {
+void hexdump(const void* data, size_t size);
+}
+
+#define PRINTLN(s)          Serial.println(s)
+#define PRINT(s)            Serial.print(s)
+#define PRINTF(fmt, ...)    Serial.printf(fmt, ##__VA_ARGS__)
+#define HEXDUMP(data, size) homekit::hexdump((data), (size));
+
+#else
+
+#define PRINTLN(s)
+#define PRINT(s)
+#define PRINTF(a)
+#define HEXDUMP(data, size)
+
+#endif
diff --git a/platformio/relayctl/src/main.cpp b/platformio/relayctl/src/main.cpp
new file mode 100644
index 0000000..4a634d6
--- /dev/null
+++ b/platformio/relayctl/src/main.cpp
@@ -0,0 +1,170 @@
+#include <Arduino.h>
+#include <ESP8266WiFi.h>
+#include <DNSServer.h>
+#include <Ticker.h>
+
+#include "mqtt.h"
+#include "config.h"
+#include "logging.h"
+#include "http_server.h"
+#include "led.h"
+#include "config.def.h"
+#include "wifi.h"
+#include "relay.h"
+#include "stopwatch.h"
+
+using namespace homekit;
+
+static Led board_led(BOARD_LED_PIN);
+static Led esp_led(ESP_LED_PIN);
+
+enum class WorkingMode {
+    RECOVERY, // AP mode, http server with configuration
+    NORMAL,   // MQTT client
+};
+static enum WorkingMode working_mode = WorkingMode::NORMAL;
+
+enum class WiFiConnectionState {
+    WAITING = 0,
+    JUST_CONNECTED = 1,
+    CONNECTED = 2
+};
+
+static const uint16_t recovery_boot_detection_ms = 2000;
+static const uint8_t recovery_boot_delay_ms = 100;
+
+static volatile enum WiFiConnectionState wifi_state = WiFiConnectionState::WAITING;
+static void* service = nullptr;
+static WiFiEventHandler wifiConnectHandler, wifiDisconnectHandler;
+static Ticker wifiTimer;
+static StopWatch blinkStopWatch;
+
+static DNSServer* dnsServer;
+
+static void onWifiConnected(const WiFiEventStationModeGotIP& event);
+static void onWifiDisconnected(const WiFiEventStationModeDisconnected& event);
+
+static void wifiConnect() {
+    char* ssid, *psk, *hostname;
+    auto cfg = config::read();
+    wifi::getConfig(cfg, &ssid, &psk, &hostname);
+
+    PRINTF("Wi-Fi STA creds: ssid=%s, psk=%s, hostname=%s\n", ssid, psk, hostname);
+
+    wifi_state = WiFiConnectionState::WAITING;
+
+    WiFi.mode(WIFI_STA);
+    WiFi.setHostname(hostname);
+    WiFi.begin(ssid, psk);
+
+    PRINT("connecting to wifi..");
+    while (WiFi.status() != WL_CONNECTED) {
+        esp_led.blink(2, 50);
+        delay(1000);
+        PRINT('.');
+    }
+    PRINT(' ');
+}
+
+static void wifiHotspot() {
+    esp_led.on();
+
+    auto scanResults = wifi::scan();
+
+    WiFi.mode(WIFI_AP);
+    WiFi.softAP(wifi::WIFI_AP_SSID);
+
+    dnsServer = new DNSServer();
+    dnsServer->start(53, "*", WiFi.softAPIP());
+
+    service = new HttpServer(scanResults);
+    ((HttpServer*)service)->start();
+}
+
+void setup() {
+#ifdef DEBUG
+    Serial.begin(115200);
+#endif
+
+    relay::init();
+
+    pinMode(FLASH_BUTTON_PIN, INPUT_PULLUP);
+    for (uint16_t i = 0; i < recovery_boot_detection_ms; i += recovery_boot_delay_ms) {
+        delay(recovery_boot_delay_ms);
+        if (digitalRead(FLASH_BUTTON_PIN) == LOW) {
+            working_mode = WorkingMode::RECOVERY;
+            break;
+        }
+    }
+
+    auto cfg = config::read();
+    if (config::isDirty(cfg)) {
+        PRINTLN("config is dirty, erasing...");
+        config::erase(cfg);
+        board_led.blink(10, 50);
+    }
+
+    switch (working_mode) {
+    case WorkingMode::RECOVERY:
+        wifiHotspot();
+        break;
+
+    case WorkingMode::NORMAL:
+        wifiConnectHandler = WiFi.onStationModeGotIP(onWifiConnected);
+        wifiDisconnectHandler = WiFi.onStationModeDisconnected(onWifiDisconnected);
+        wifiConnect();
+        break;
+    }
+}
+
+void loop() {
+    if (working_mode == WorkingMode::NORMAL) {
+        if (wifi_state == WiFiConnectionState::JUST_CONNECTED) {
+            board_led.blink(3, 300);
+            wifi_state = WiFiConnectionState::CONNECTED;
+
+            if (service == nullptr)
+                service = new mqtt::MQTT();
+
+            ((mqtt::MQTT*)service)->connect();
+            blinkStopWatch.save();
+        }
+
+        auto mqtt = (mqtt::MQTT*)service;
+        if (static_cast<int>(wifi_state) >= 1
+                && mqtt != nullptr) {
+            if (!mqtt->loop()) {
+                PRINTLN("mqtt::loop() returned false");
+                // FIXME do something here
+            }
+
+            if (mqtt->statStopWatch.elapsed(10000)) {
+                mqtt->sendStat();
+            }
+
+            // periodically blink board led
+            if (blinkStopWatch.elapsed(5000)) {
+                board_led.blink(1, 10);
+                blinkStopWatch.save();
+            }
+        }
+
+        delay(500);
+    } else {
+        if (dnsServer != nullptr)
+            dnsServer->processNextRequest();
+    }
+}
+
+static void onWifiConnected(const WiFiEventStationModeGotIP& event) {
+    PRINTF("connected (%s)\n", WiFi.localIP().toString().c_str());
+    wifi_state = WiFiConnectionState::JUST_CONNECTED;
+}
+
+static void onWifiDisconnected(const WiFiEventStationModeDisconnected& event) {
+    PRINTLN("disconnected from wi-fi");
+    wifi_state = WiFiConnectionState::WAITING;
+    if (service != nullptr)
+        ((mqtt::MQTT*)service)->disconnect();
+    wifiTimer.once(2, wifiConnect);
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/mqtt.cpp b/platformio/relayctl/src/mqtt.cpp
new file mode 100644
index 0000000..cca215b
--- /dev/null
+++ b/platformio/relayctl/src/mqtt.cpp
@@ -0,0 +1,172 @@
+#include "mqtt.h"
+#include "logging.h"
+#include "wifi.h"
+#include "config.def.h"
+#include "relay.h"
+#include "config.h"
+
+namespace homekit::mqtt {
+
+static const uint8_t MQTT_CA_FINGERPRINT[] = DEFAULT_MQTT_CA_FINGERPRINT;
+static const char MQTT_SERVER[] = DEFAULT_MQTT_SERVER;
+static const uint16_t MQTT_PORT = DEFAULT_MQTT_PORT;
+static const char MQTT_USERNAME[] = DEFAULT_MQTT_USERNAME;
+static const char MQTT_PASSWORD[] = DEFAULT_MQTT_PASSWORD;
+static const char MQTT_CLIENT_ID[] = DEFAULT_MQTT_CLIENT_ID;
+
+static const char MQTT_SECRET[] = SECRET;
+static const char TOPIC_RELAY_POWER[] = "relay/power";
+static const char TOPIC_STAT[] = "stat";
+static const char TOPIC_STAT1[] = "stat1";
+static const char TOPIC_ADMIN[] = "admin";
+static const char TOPIC_RELAY[] = "relay";
+
+
+using namespace homekit;
+
+MQTT::MQTT() : client(wifiClient) {
+    randomSeed(micros());
+
+    wifiClient.setFingerprint(MQTT_CA_FINGERPRINT);
+
+    client.setServer(MQTT_SERVER, MQTT_PORT);
+    client.setCallback([&](char* topic, byte* payload, unsigned int length)  {
+        this->callback(topic, payload, length);
+    });
+}
+
+void MQTT::connect() {
+    reconnect();
+}
+
+void MQTT::reconnect() {
+    char buf[128] {0};
+
+    if (client.connected()) {
+        PRINTLN("warning: already connected");
+        return;
+    }
+
+    // Attempt to connect
+    if (client.connect(MQTT_CLIENT_ID, MQTT_USERNAME, MQTT_PASSWORD)) {
+        PRINTLN("mqtt: connected");
+
+        sendInitialStat();
+
+        subscribe(TOPIC_RELAY);
+        subscribe(TOPIC_ADMIN);
+    } else {
+        PRINTF("mqtt: failed to connect, rc=%d\n", client.state());
+        wifiClient.getLastSSLError(buf, sizeof(buf));
+        PRINTF("SSL error: %s\n", buf);
+
+        reconnectTimer.once(2, [&]() {
+            reconnect();
+        });
+    }
+}
+
+void MQTT::disconnect() {
+    // TODO test how this works???
+    reconnectTimer.detach();
+    client.disconnect();
+    wifiClient.stop();
+}
+
+bool MQTT::loop() {
+    return client.loop();
+}
+
+bool MQTT::publish(const char* topic, uint8_t *payload, size_t length) {
+    char full_topic[40] {0};
+    strcpy(full_topic, "/hk/");
+    strcat(full_topic, wifi::NODE_ID);
+    strcat(full_topic, "/");
+    strcat(full_topic, topic);
+    return client.publish(full_topic, payload, length);
+}
+
+bool MQTT::subscribe(const char *topic) {
+    char full_topic[40] {0};
+    strcpy(full_topic, "/hk/");
+    strcat(full_topic, wifi::NODE_ID);
+    strcat(full_topic, "/");
+    strcat(full_topic, topic);
+    strcat(full_topic, "/#");
+    bool res = client.subscribe(full_topic, 1);
+    if (!res)
+        PRINTF("error: failed to subscribe to %s\n", full_topic);
+    return res;
+}
+
+void MQTT::sendInitialStat() {
+    auto cfg = config::read();
+    InitialStatPayload stat {
+        .ip = wifi::getIPAsInteger(),
+        .fw_version = FW_VERSION,
+        .rssi = wifi::getRSSI(),
+        .free_heap = ESP.getFreeHeap(),
+        .flags = StatFlags {
+            .state = static_cast<uint8_t>(relay::getState() ? 1 : 0),
+            .config_changed_value_present = 1,
+            .config_changed = static_cast<uint8_t>(cfg.flags.node_configured || cfg.flags.wifi_configured ? 1 : 0)
+        }
+    };
+    publish(TOPIC_STAT1, reinterpret_cast<uint8_t*>(&stat), sizeof(stat));
+    statStopWatch.save();
+}
+
+void MQTT::sendStat() {
+    StatPayload stat {
+            .rssi = wifi::getRSSI(),
+            .free_heap = ESP.getFreeHeap(),
+            .flags = StatFlags {
+                    .state = static_cast<uint8_t>(relay::getState() ? 1 : 0),
+                    .config_changed_value_present = 0,
+                    .config_changed = 0
+            }
+    };
+
+    PRINTF("free heap: %d\n", ESP.getFreeHeap());
+
+    publish(TOPIC_STAT, reinterpret_cast<uint8_t*>(&stat), sizeof(stat));
+    statStopWatch.save();
+}
+
+void MQTT::callback(char* topic, uint8_t* payload, uint32_t length) {
+    const size_t bufsize = 16;
+    char relevant_topic[bufsize];
+    strncpy(relevant_topic, topic+strlen(wifi::NODE_ID)+5, bufsize);
+
+    if (strncmp(TOPIC_RELAY_POWER, relevant_topic, bufsize) == 0) {
+        handleRelayPowerPayload(payload, length);
+    } else {
+        PRINTF("error: invalid topic %s\n", topic);
+    }
+}
+
+void MQTT::handleRelayPowerPayload(uint8_t *payload, uint32_t length) {
+    if (length != sizeof(PowerPayload)) {
+        PRINTF("error: size of payload (%ul) does not match expected (%ul)\n",
+               length, sizeof(PowerPayload));
+        return;
+    }
+
+    auto pd = reinterpret_cast<struct PowerPayload*>(payload);
+    if (strncmp(pd->secret, MQTT_SECRET, sizeof(pd->secret)) != 0) {
+        PRINTLN("error: invalid secret");
+        return;
+    }
+
+    if (pd->state == 1) {
+        relay::setOn();
+    } else if (pd->state == 0) {
+        relay::setOff();
+    } else {
+        PRINTLN("error: unexpected state value");
+    }
+
+    sendStat();
+}
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/mqtt.h b/platformio/relayctl/src/mqtt.h
new file mode 100644
index 0000000..a769750
--- /dev/null
+++ b/platformio/relayctl/src/mqtt.h
@@ -0,0 +1,57 @@
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+#include <Ticker.h>
+#include "stopwatch.h"
+
+namespace homekit::mqtt {
+
+class MQTT {
+private:
+    WiFiClientSecure wifiClient;
+    PubSubClient client;
+    Ticker reconnectTimer;
+
+    void callback(char* topic, uint8_t* payload, size_t length);
+    void handleRelayPowerPayload(uint8_t* payload, uint32_t length);
+    bool publish(const char* topic, uint8_t* payload, size_t length);
+    bool subscribe(const char* topic);
+    void sendInitialStat();
+
+public:
+    StopWatch statStopWatch;
+
+    MQTT();
+    void connect();
+    void disconnect();
+    void reconnect();
+    bool loop();
+    void sendStat();
+};
+
+struct StatFlags {
+    uint8_t state: 1;
+    uint8_t config_changed_value_present: 1;
+    uint8_t config_changed: 1;
+    uint8_t reserved: 5;
+} __attribute__((packed));
+
+struct InitialStatPayload {
+    uint32_t ip;
+    uint8_t fw_version;
+    int8_t rssi;
+    uint32_t free_heap;
+    StatFlags flags;
+} __attribute__((packed));
+
+struct StatPayload {
+    int8_t rssi;
+    uint32_t free_heap;
+    StatFlags flags;
+} __attribute__((packed));
+
+struct PowerPayload {
+    char secret[12];
+    uint8_t state;
+} __attribute__((packed));
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/relay.h b/platformio/relayctl/src/relay.h
new file mode 100644
index 0000000..a3519ac
--- /dev/null
+++ b/platformio/relayctl/src/relay.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <Arduino.h>
+#include "config.def.h"
+
+namespace homekit::relay {
+
+inline void init() {
+    pinMode(RELAY_PIN, OUTPUT);
+}
+
+inline bool getState() {
+    return digitalRead(RELAY_PIN) == 1;
+}
+
+inline void setOn() {
+    digitalWrite(RELAY_PIN, HIGH);
+}
+
+inline void setOff() {
+    digitalWrite(RELAY_PIN, LOW);
+}
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/static.cpp b/platformio/relayctl/src/static.cpp
new file mode 100644
index 0000000..8e2c56d
--- /dev/null
+++ b/platformio/relayctl/src/static.cpp
@@ -0,0 +1,276 @@
+/**
+ * This file is autogenerated with make_static.sh script
+ */
+
+#include "static.h"
+
+namespace homekit::files {
+
+static const uint8_t index_html_content[] PROGMEM = {
+    0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x9d, 0x56, 0xdb, 0x8a, 0xdc, 0x38, 
+    0x10, 0x7d, 0x9f, 0xaf, 0x50, 0xf4, 0xb0, 0xcc, 0xc0, 0xb4, 0xbd, 0xd3, 0x81, 0x21, 0x6c, 0x6c, 
+    0xc3, 0x92, 0x0b, 0x04, 0xc2, 0x32, 0x4c, 0x13, 0x02, 0x79, 0x69, 0x64, 0xb9, 0xdc, 0x56, 0x5a, 
+    0x96, 0xb4, 0x56, 0xd9, 0x3d, 0xbd, 0x5f, 0x9f, 0x92, 0x6c, 0xf7, 0x65, 0xd3, 0x4c, 0x2e, 0x2f, 
+    0x6d, 0x57, 0xa9, 0xea, 0xd4, 0xa9, 0xa3, 0x92, 0xd5, 0xd9, 0x8b, 0xca, 0x4a, 0xdc, 0x3b, 0x60, 
+    0x0d, 0xb6, 0xba, 0xb8, 0xca, 0xc2, 0x83, 0x69, 0x61, 0x36, 0x39, 0x07, 0xc3, 0x83, 0x03, 0x44, 
+    0x45, 0x8f, 0x16, 0x50, 0x50, 0x0c, 0xba, 0x05, 0xfc, 0xdb, 0xab, 0x21, 0xe7, 0xd2, 0x1a, 0x04, 
+    0x83, 0x8b, 0x90, 0xcc, 0xd9, 0x64, 0xe5, 0x1c, 0xe1, 0x09, 0xd3, 0x00, 0xf2, 0x9a, 0xc9, 0x46, 
+    0x74, 0x1e, 0x30, 0xef, 0xb1, 0x5e, 0xbc, 0xe2, 0x33, 0x86, 0x11, 0x2d, 0xe4, 0x7c, 0x50, 0xb0, 
+    0x73, 0xb6, 0xc3, 0x93, 0xcc, 0x9d, 0xaa, 0xb0, 0xc9, 0x2b, 0x18, 0x94, 0x84, 0x45, 0x34, 0x6e, 
+    0x95, 0x51, 0xa8, 0x84, 0x5e, 0x78, 0x29, 0x34, 0xe4, 0x77, 0xb7, 0x2d, 0x39, 0xda, 0xbe, 0x3d, 
+    0xda, 0xe2, 0xe9, 0xcc, 0xee, 0x3d, 0x74, 0xd1, 0x10, 0x25, 0xd9, 0xc6, 0x86, 0xa2, 0xa8, 0x50, 
+    0x43, 0xf1, 0xc6, 0x9a, 0x5a, 0x6d, 0xfa, 0x4e, 0xa0, 0xb2, 0x26, 0x4b, 0x47, 0xe7, 0x55, 0xa6, 
+    0x95, 0xd9, 0xb2, 0x0e, 0x74, 0xce, 0x7d, 0x43, 0x6c, 0x64, 0x8f, 0x4c, 0x11, 0x21, 0xce, 0x9a, 
+    0x0e, 0xea, 0x9c, 0xa7, 0xb5, 0x18, 0x82, 0x9d, 0xd0, 0x0f, 0x67, 0xa1, 0xd3, 0x9c, 0xab, 0x56, 
+    0x6c, 0x20, 0x7d, 0x5a, 0xc4, 0xb8, 0x73, 0x08, 0xdc, 0x6b, 0xf0, 0x0d, 0x00, 0xce, 0xb1, 0x51, 
+    0x0c, 0xe9, 0xfd, 0x01, 0x2f, 0x86, 0x24, 0xc1, 0x43, 0x99, 0x5e, 0x76, 0xca, 0x21, 0xf3, 0x9d, 
+    0xa4, 0x15, 0xe1, 0x5c, 0xf2, 0x95, 0xdc, 0x59, 0x3a, 0xba, 0x69, 0x3d, 0x9d, 0xa4, 0x2f, 0x6d, 
+    0xb5, 0x67, 0xd6, 0x68, 0x2b, 0x2a, 0x2a, 0x4f, 0x92, 0xfc, 0xed, 0xdc, 0xf5, 0x4d, 0x40, 0xa8, 
+    0xd4, 0xc0, 0xa4, 0x16, 0xde, 0x53, 0xa9, 0xd0, 0x11, 0x2f, 0x56, 0x80, 0xa8, 0xcc, 0xc6, 0xb3, 
+    0xcc, 0x3b, 0x61, 0x98, 0xa2, 0x8c, 0x90, 0x47, 0xae, 0x35, 0x89, 0x02, 0x9a, 0x17, 0xd7, 0x93, 
+    0x9d, 0x24, 0xc9, 0x0d, 0x15, 0xa3, 0x28, 0xaa, 0x49, 0x40, 0xe7, 0x70, 0xa5, 0xb6, 0x72, 0x1b, 
+    0x4a, 0xd4, 0xb6, 0x6b, 0x19, 0x6d, 0x5c, 0x63, 0x09, 0xca, 0x59, 0x4f, 0xbd, 0x09, 0x19, 0x44, 
+    0x8c, 0xdd, 0x08, 0xec, 0xa9, 0xb9, 0x71, 0x4b, 0x0d, 0xe0, 0xce, 0x76, 0xdb, 0xb5, 0x9f, 0x28, 
+    0xfc, 0x8f, 0x60, 0x00, 0x9a, 0x39, 0x7c, 0x56, 0xef, 0x15, 0x5b, 0xad, 0x3e, 0xbc, 0xbd, 0x50, 
+    0x39, 0xc6, 0x29, 0xe3, 0x7a, 0x8c, 0x1a, 0x81, 0x06, 0x89, 0xb1, 0x0f, 0xef, 0x55, 0xb5, 0x1e, 
+    0xed, 0xb9, 0x64, 0x70, 0xf1, 0x43, 0x62, 0xaf, 0xf5, 0x38, 0x37, 0x21, 0xd1, 0xba, 0x40, 0x92, 
+    0x0d, 0x42, 0xf7, 0x14, 0xc8, 0x8b, 0x8f, 0x87, 0xae, 0xb3, 0x74, 0x5c, 0x0b, 0x0a, 0x8f, 0x70, 
+    0xe1, 0xed, 0x32, 0x8f, 0x53, 0xbe, 0x0f, 0xe4, 0xa6, 0x06, 0xab, 0x1f, 0x72, 0x8e, 0x2f, 0xd3, 
+    0x04, 0xb8, 0x29, 0x89, 0x1f, 0x98, 0x4c, 0xd4, 0x9d, 0xdf, 0x5e, 0x62, 0x1e, 0x3b, 0xad, 0x75, 
+    0xb5, 0x8e, 0xeb, 0x34, 0xdf, 0x1a, 0xcc, 0x86, 0x8e, 0x05, 0xbf, 0x7f, 0xc9, 0x59, 0xa5, 0x7c, 
+    0x18, 0xec, 0xea, 0x42, 0x71, 0xd9, 0x80, 0xdc, 0x96, 0xf6, 0x29, 0x4e, 0x64, 0x20, 0xcd, 0xc8, 
+    0x1d, 0xa7, 0x7a, 0x17, 0xa1, 0x8a, 0x33, 0x56, 0x87, 0xe8, 0x59, 0xc7, 0x39, 0x6c, 0x14, 0xfa, 
+    0x90, 0xc4, 0xc2, 0x2b, 0x73, 0x87, 0xc6, 0x23, 0xf2, 0x51, 0xad, 0xe7, 0x45, 0xfb, 0xc7, 0x56, 
+    0xc0, 0x7e, 0x62, 0x8b, 0x4f, 0x89, 0x85, 0x03, 0x73, 0x22, 0xd5, 0x49, 0xff, 0x77, 0xf7, 0x87, 
+    0x39, 0x0b, 0x7b, 0x3e, 0xcb, 0x64, 0x2e, 0x0f, 0xc0, 0xa9, 0x54, 0x53, 0xfd, 0xb2, 0x47, 0xa4, 
+    0x81, 0x18, 0xeb, 0xf8, 0xbe, 0x6c, 0x15, 0x1e, 0xc3, 0x66, 0x1d, 0x46, 0x77, 0xb1, 0x12, 0x03, 
+    0x30, 0x61, 0x2a, 0xf6, 0x08, 0xa5, 0xb5, 0x98, 0xa5, 0x63, 0x72, 0x00, 0x0b, 0xdc, 0x2f, 0xb6, 
+    0x3e, 0x1d, 0xc0, 0x4f, 0xae, 0x12, 0x08, 0xac, 0x56, 0x5d, 0xbb, 0x13, 0x1d, 0xb0, 0xeb, 0xa4, 
+    0x54, 0xe6, 0xe6, 0x77, 0x4f, 0x58, 0x1f, 0xd1, 0x38, 0x03, 0x23, 0x47, 0xe2, 0x6d, 0xaf, 0x51, 
+    0x39, 0xd1, 0x61, 0x24, 0xb2, 0xa0, 0x55, 0x31, 0xeb, 0x32, 0xc6, 0x3e, 0x7b, 0xfc, 0x2e, 0x6a, 
+    0x5e, 0x2b, 0xe2, 0x4d, 0x25, 0x25, 0x38, 0xfa, 0x0a, 0x07, 0xba, 0xb7, 0xe1, 0x27, 0xd9, 0xfc, 
+    0x37, 0x23, 0xc7, 0x88, 0x1f, 0x28, 0x79, 0x2e, 0xe0, 0x27, 0x17, 0xbe, 0x32, 0xbf, 0xa2, 0xdb, 
+    0x23, 0x10, 0x71, 0x36, 0x93, 0xff, 0x5d, 0xbd, 0xba, 0x80, 0xc2, 0x7f, 0x8a, 0xe3, 0x8c, 0xab, 
+    0xfc, 0x7a, 0xca, 0x8a, 0x14, 0x7e, 0x85, 0xf3, 0x07, 0x53, 0xdb, 0x67, 0x98, 0xbe, 0x5b, 0x3d, 
+    0xbc, 0x5a, 0xde, 0xdf, 0x2f, 0x4a, 0xe1, 0x69, 0xc2, 0xb2, 0xb2, 0xa0, 0x5b, 0x42, 0xec, 0x25, 
+    0x6a, 0xaa, 0x51, 0xdc, 0x1e, 0x47, 0x64, 0x58, 0x66, 0x65, 0x57, 0x5c, 0x3d, 0xd0, 0xae, 0x32, 
+    0x5b, 0xb3, 0x4c, 0x4c, 0xb7, 0x45, 0xb8, 0x6d, 0xfd, 0x5f, 0x69, 0xba, 0x51, 0x98, 0xc8, 0xe6, 
+    0xce, 0x25, 0xca, 0xa6, 0x8d, 0x6d, 0x61, 0x4b, 0x36, 0xf9, 0x52, 0x5e, 0x4c, 0x56, 0x96, 0x8a, 
+    0x82, 0x95, 0xfb, 0xef, 0x33, 0xa7, 0x2c, 0x5e, 0xbc, 0x1b, 0x36, 0x60, 0xf6, 0xec, 0x8b, 0x32, 
+    0x96, 0x6e, 0xde, 0x21, 0x26, 0xfc, 0x21, 0xad, 0xdb, 0xbf, 0x66, 0xcb, 0x3f, 0x97, 0xcb, 0xe3, 
+    0x89, 0x0e, 0x77, 0x4d, 0xbc, 0x7a, 0xe2, 0xbf, 0x81, 0x6f, 0xa3, 0xf2, 0xc7, 0xe5, 0x1e, 0x08, 
+    0x00, 0x00, 
+};
+const StaticFile index_html PROGMEM = {(sizeof(index_html_content)/sizeof(index_html_content[0])), index_html_content};
+
+static const uint8_t app_js_content[] PROGMEM = {
+    0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x9d, 0x56, 0x5b, 0x6f, 0xdc, 0x44, 
+    0x14, 0x7e, 0xe7, 0x57, 0x78, 0x47, 0x22, 0xf2, 0xb0, 0x8e, 0x73, 0x81, 0x87, 0x6a, 0x5d, 0x6b, 
+    0xd5, 0x2b, 0x2d, 0x6a, 0x9b, 0xaa, 0x49, 0x11, 0x52, 0x14, 0xa2, 0x59, 0xfb, 0x6c, 0xd6, 0x8d, 
+    0x77, 0xc6, 0x8c, 0xc7, 0xd9, 0x84, 0x6d, 0x24, 0xda, 0x3e, 0x80, 0x04, 0x52, 0x25, 0xde, 0xe1, 
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+};
+const StaticFile app_js PROGMEM = {(sizeof(app_js_content)/sizeof(app_js_content[0])), app_js_content};
+
+static const uint8_t style_css_content[] PROGMEM = {
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+    0x1b, 0x6d, 0x1c, 0xb9, 0x01, 0x29, 0xef, 0xe5, 0x32, 0x63, 0x81, 0x3c, 0xb8, 0x98, 0x99, 0x30, 
+    0x59, 0x49, 0xd2, 0x70, 0xdd, 0x1b, 0xad, 0xc4, 0xec, 0x46, 0x6c, 0x20, 0x81, 0x75, 0x36, 0x76, 
+    0xdf, 0xaf, 0x57, 0xc0, 0x1e, 0xb2, 0x93, 0x99, 0x96, 0x76, 0xdf, 0xce, 0x99, 0x36, 0x7c, 0x7b, 
+    0x46, 0xa1, 0x9d, 0xcb, 0x5a, 0xeb, 0x78, 0xa7, 0x04, 0x16, 0x4d, 0x7f, 0x86, 0x74, 0xf2, 0x31, 
+    0xe0, 0xec, 0xbb, 0x8b, 0x5d, 0xdb, 0x11, 0xb2, 0x6b, 0x36, 0xae, 0x7c, 0xd6, 0x94, 0xc1, 0x89, 
+    0xe8, 0xb3, 0x64, 0xb6, 0xb8, 0x1c, 0x61, 0xec, 0xed, 0x65, 0x6e, 0x86, 0xb5, 0x1c, 0x59, 0xf7, 
+    0x5c, 0xfa, 0x32, 0x2f, 0x80, 0x6f, 0xc3, 0xcb, 0xd3, 0x6b, 0x31, 0x1a, 0x4b, 0xc2, 0x6b, 0xed, 
+    0xbb, 0x76, 0x16, 0x79, 0xd0, 0xc0, 0xb1, 0x19, 0x19, 0x3a, 0x2a, 0x54, 0xed, 0xc9, 0x43, 0x20, 
+    0x33, 0x64, 0x4e, 0xf5, 0xe1, 0x1b, 0xce, 0xb9, 0xcc, 0x26, 0xd6, 0xeb, 0x50, 0xd9, 0x84, 0x46, 
+    0x53, 0x63, 0x58, 0x27, 0x04, 0xc7, 0x5c, 0x43, 0x24, 0xd2, 0xf0, 0xda, 0x5f, 0xe0, 0x8e, 0xe9, 
+    0x01, 0x7d, 0x08, 0x9a, 0x5e, 0xb0, 0x82, 0x0a, 0xb3, 0xeb, 0x15, 0xe9, 0x37, 0xeb, 0x72, 0x46, 
+    0x6f, 0x93, 0xa8, 0xfb, 0xe6, 0xe9, 0xf2, 0xae, 0x1d, 0xfc, 0x48, 0x84, 0xf2, 0x94, 0x69, 0x10, 
+    0x57, 0x8d, 0x79, 0xb5, 0x3a, 0xa0, 0x1e, 0x2b, 0x23, 0xf0, 0x14, 0x37, 0x97, 0x6e, 0x91, 0x69, 
+    0x70, 0xcb, 0x62, 0x72, 0xcb, 0x59, 0x72, 0x64, 0xf1, 0xbf, 0xa2, 0x75, 0xcb, 0x7b, 0x55, 0xed, 
+    0xc4, 0xa8, 0xe1, 0x7d, 0x29, 0x27, 0xff, 0x25, 0xc1, 0xc3, 0xd6, 0x78, 0x85, 0x2a, 0xcc, 0xeb, 
+    0x40, 0x53, 0x54, 0x2f, 0x90, 0x75, 0x77, 0xe2, 0x62, 0xb0, 0x48, 0xfa, 0xe9, 0x8a, 0x67, 0x46, 
+    0x81, 0x2a, 0x83, 0xb7, 0xc7, 0xe9, 0xee, 0x48, 0x61, 0x5e, 0xc0, 0xbd, 0x47, 0xe0, 0x8c, 0xd7, 
+    0xce, 0x07, 0x78, 0x6b, 0x54, 0x85, 0xe0, 0xde, 0x8c, 0xcf, 0x96, 0x9c, 0xc3, 0xe2, 0xfc, 0x0f, 
+    0xf9, 0x07, 0x22, 0xe5, 0x1d, 0xdf, 0xa6, 0x33, 0x63, 0x50, 0x63, 0x6c, 0x9a, 0x2b, 0xff, 0xec, 
+    0xc0, 0x03, 0x46, 0x6f, 0xe2, 0xeb, 0x7c, 0xa7, 0xff, 0x76, 0xb5, 0xd8, 0xa4, 0xeb, 0xf6, 0xc3, 
+    0x5f, 0xa4, 0x85, 0xb2, 0x78, 0xae, 0x04, 0x00, 0x00, 
+};
+const StaticFile style_css PROGMEM = {(sizeof(style_css_content)/sizeof(style_css_content[0])), style_css_content};
+
+static const uint8_t favicon_ico_content[] PROGMEM = {
+    0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xed, 0x99, 0x4b, 0x48, 0x15, 0x61, 
+    0x14, 0xc7, 0xcf, 0xc5, 0x17, 0x2e, 0x4a, 0x57, 0xe5, 0x63, 0xe1, 0x85, 0x42, 0x23, 0x8c, 0x8c, 
+    0x20, 0x4d, 0x45, 0xdb, 0x59, 0x14, 0x2e, 0x7a, 0xab, 0x68, 0x1b, 0x17, 0xae, 0x24, 0x41, 0xf1, 
+    0x41, 0xa0, 0x41, 0xa1, 0x11, 0x28, 0x1a, 0x2e, 0x12, 0x72, 0xe7, 0x03, 0x09, 0x74, 0x15, 0x54, 
+    0x1b, 0x97, 0xd9, 0x53, 0x23, 0x8a, 0x5a, 0x94, 0x25, 0x59, 0x91, 0x82, 0xa0, 0x81, 0x99, 0x39, 
+    0xfd, 0x8f, 0x73, 0x46, 0xbf, 0xc6, 0xb9, 0x73, 0x67, 0xee, 0x9d, 0xab, 0x41, 0x1e, 0xf8, 0x71, 
+    0xe7, 0x7e, 0xe7, 0xf1, 0x9f, 0xb9, 0xdf, 0x7c, 0x8f, 0x99, 0x4b, 0xe4, 0xa3, 0x28, 0x4a, 0x4c, 
+    0x24, 0x7c, 0xfa, 0xa9, 0x2a, 0x9a, 0xe8, 0x08, 0x11, 0x25, 0x25, 0xe9, 0xdf, 0xdb, 0xe2, 0x89, 
+    0x7a, 0xd1, 0xe6, 0xf7, 0xeb, 0xdf, 0x07, 0x11, 0x97, 0xbe, 0x93, 0x68, 0x1f, 0x62, 0x70, 0x88, 
+    0x16, 0xbd, 0x7d, 0xd5, 0x10, 0x37, 0x43, 0x3a, 0x0e, 0x2c, 0x06, 0xdc, 0x16, 0x62, 0x9c, 0xa5, 
+    0xfc, 0x65, 0xb1, 0x60, 0x58, 0x88, 0x75, 0x99, 0x9b, 0x06, 0x2a, 0xc1, 0x1b, 0xa1, 0x52, 0xda, 
+    0x82, 0x19, 0xae, 0x90, 0xca, 0xc0, 0x04, 0x58, 0x02, 0x9a, 0xb0, 0x24, 0x6d, 0xa5, 0x12, 0x13, 
+    0xc8, 0xd8, 0x3f, 0xab, 0xe4, 0x99, 0x99, 0x95, 0xfa, 0x56, 0xe6, 0x17, 0x8d, 0x40, 0xb9, 0x06, 
+    0x13, 0x12, 0x6b, 0xb6, 0x4b, 0xa6, 0x73, 0x0e, 0xc4, 0x92, 0xc4, 0x9a, 0xed, 0xba, 0x83, 0x5c, 
+    0x83, 0x6b, 0x16, 0xf9, 0x1d, 0x2e, 0xf2, 0x3b, 0x2c, 0xf2, 0xdb, 0x5d, 0xe4, 0xb7, 0x9b, 0x72, 
+    0xf9, 0xfe, 0xea, 0x76, 0x91, 0xcf, 0xb1, 0x6a, 0x3f, 0x9e, 0x03, 0x5f, 0x5c, 0xe4, 0x73, 0xec, 
+    0x59, 0x25, 0xbf, 0x00, 0xdc, 0x02, 0x5d, 0xe0, 0x2e, 0x58, 0x00, 0xf7, 0xe5, 0x7b, 0x97, 0x1c, 
+    0x2f, 0x88, 0xaf, 0x4b, 0x62, 0x0b, 0x4c, 0xd7, 0xe0, 0x93, 0xcf, 0x7c, 0xf0, 0x99, 0xf4, 0x7b, 
+    0xc9, 0xb0, 0x52, 0x69, 0xcb, 0x37, 0xc5, 0x5a, 0x59, 0x1e, 0x98, 0x06, 0x25, 0x4a, 0x5b, 0x89, 
+    0xb4, 0xe5, 0xd9, 0xe4, 0x19, 0x96, 0x09, 0x9e, 0x83, 0x22, 0xa5, 0xad, 0x48, 0xda, 0x32, 0xcd, 
+    0xc1, 0x8b, 0x18, 0x55, 0x93, 0x71, 0x44, 0xa3, 0x51, 0x44, 0x2d, 0x3e, 0x1d, 0xa7, 0xc6, 0x79, 
+    0x3c, 0xcf, 0x60, 0x2a, 0xa2, 0x2c, 0x52, 0xe6, 0x99, 0x78, 0x57, 0xf3, 0x8c, 0xd9, 0x52, 0xc1, 
+    0x43, 0xf0, 0x40, 0x8e, 0xbd, 0xb6, 0x1c, 0xf0, 0x5e, 0xc8, 0x89, 0x40, 0xfd, 0x6c, 0xf0, 0x41, 
+    0xc8, 0xf6, 0xb0, 0x2e, 0x8f, 0x91, 0xbd, 0xa0, 0x0a, 0x7c, 0x15, 0xf8, 0x78, 0x0f, 0xd9, 0xcf, 
+    0x69, 0xc1, 0x8c, 0x7b, 0x9c, 0xbb, 0xaf, 0x0d, 0x3c, 0x05, 0xf3, 0xb4, 0x3e, 0x4e, 0xe6, 0xa5, 
+    0xad, 0x15, 0x1c, 0x24, 0xfb, 0xfb, 0xd6, 0xca, 0xf8, 0xbc, 0x78, 0x6c, 0x3a, 0x99, 0x17, 0xc7, 
+    0x25, 0xd6, 0xe9, 0xb5, 0xf0, 0xb9, 0x9c, 0x27, 0x7d, 0x5c, 0x38, 0x1d, 0xf7, 0xd3, 0x92, 0xe3, 
+    0xe4, 0x3a, 0xf8, 0x37, 0x79, 0xe1, 0xa2, 0xb6, 0x7a, 0x1d, 0x59, 0x41, 0x6a, 0x73, 0x5f, 0xb6, 
+    0x85, 0x50, 0xdb, 0xe0, 0x06, 0xd9, 0xaf, 0xc9, 0xe9, 0xa4, 0xf7, 0x5b, 0xa8, 0xf5, 0x9f, 0x48, 
+    0x8d, 0x40, 0x76, 0x0c, 0xfc, 0x08, 0xa3, 0x3e, 0xcf, 0xa5, 0x85, 0x36, 0xf5, 0xcf, 0x84, 0x51, 
+    0xdb, 0xe0, 0xb4, 0x4d, 0xfd, 0x72, 0x0f, 0xea, 0x97, 0xdb, 0xd4, 0xaf, 0xf0, 0xa0, 0x7e, 0xc5, 
+    0x16, 0xd6, 0x2f, 0xf3, 0xa0, 0x7e, 0xa0, 0x7d, 0x12, 0xcf, 0x57, 0x9d, 0x1e, 0xd4, 0xef, 0x94, 
+    0x5a, 0xaa, 0x61, 0x15, 0xa3, 0x5e, 0xf0, 0xd3, 0x83, 0xfa, 0x5c, 0xe3, 0x8e, 0xd4, 0x34, 0x8c, 
+    0xe7, 0x8d, 0x26, 0xf0, 0x58, 0x18, 0x03, 0xcf, 0x48, 0x5f, 0xea, 0x38, 0x67, 0x4a, 0xf1, 0x19, 
+    0x4c, 0x89, 0x6f, 0x46, 0x62, 0xc7, 0x14, 0x5f, 0x13, 0x6d, 0x9c, 0x8b, 0x78, 0x5c, 0xef, 0x06, 
+    0x29, 0xa4, 0x2f, 0xad, 0xbc, 0xc4, 0x8e, 0x80, 0x15, 0xd2, 0xe7, 0xe1, 0x64, 0xf1, 0xa5, 0xc8, 
+    0x71, 0xab, 0xf8, 0x46, 0x68, 0x7d, 0x39, 0x4e, 0x91, 0x1a, 0x4e, 0xf6, 0xed, 0x09, 0xa0, 0x5f, 
+    0x6a, 0x34, 0x58, 0xf8, 0x1b, 0xc4, 0xd7, 0x2f, 0xb1, 0x6e, 0x8d, 0x1f, 0x43, 0x06, 0xa4, 0x46, 
+    0xa3, 0x85, 0xbf, 0x51, 0x7c, 0x03, 0x12, 0xeb, 0xd6, 0xf8, 0x9c, 0xfa, 0xa4, 0x46, 0xbd, 0x85, 
+    0xbf, 0x5e, 0x7c, 0x7d, 0x14, 0xda, 0xf9, 0x73, 0xff, 0x5f, 0x01, 0x9f, 0xc0, 0x49, 0x0b, 0x3f, 
+    0xb7, 0x4d, 0x49, 0x4c, 0x94, 0x85, 0x7f, 0xd5, 0xb4, 0xab, 0xda, 0x2a, 0x2b, 0xd4, 0x4c, 0x8b, 
+    0x78, 0x94, 0x99, 0xc3, 0xa9, 0x4c, 0x52, 0xdc, 0x2a, 0xa3, 0x48, 0x63, 0x5a, 0x70, 0x2b, 0x04, 
+    0xc2, 0x6c, 0xdc, 0xb6, 0x98, 0x94, 0xb6, 0x06, 0x77, 0xbc, 0x9f, 0xf4, 0x89, 0x79, 0x6d, 0x1f, 
+    0x96, 0xb8, 0x71, 0x1f, 0x76, 0xea, 0x72, 0x51, 0x48, 0x48, 0xf9, 0x77, 0xe0, 0x2d, 0x48, 0x0b, 
+    0xb5, 0x4e, 0x18, 0xfa, 0xd5, 0xb4, 0x3e, 0x36, 0xab, 0xb7, 0x40, 0xbf, 0x56, 0xd1, 0xaf, 0xfd, 
+    0x0f, 0xf5, 0xeb, 0x14, 0xfd, 0xba, 0x4d, 0xd2, 0xe4, 0xdb, 0x9a, 0x9f, 0x35, 0x5f, 0x82, 0xdf, 
+    0x8a, 0x3e, 0x1f, 0xf3, 0x9e, 0x92, 0x9f, 0x23, 0x33, 0x22, 0xa0, 0xcb, 0x73, 0xe7, 0x10, 0xe9, 
+    0xf3, 0x46, 0xb0, 0x75, 0x82, 0x63, 0x06, 0xc1, 0x2e, 0x8f, 0xb4, 0xf3, 0x68, 0x7d, 0x3d, 0x71, 
+    0xc3, 0x77, 0x90, 0x1b, 0xa6, 0x76, 0x21, 0xe9, 0x7b, 0xb3, 0x50, 0xd7, 0x4c, 0xce, 0x2d, 0x08, 
+    0xe3, 0x37, 0x77, 0xb3, 0x97, 0x0f, 0xc4, 0x37, 0x90, 0x1c, 0x82, 0xfe, 0x90, 0x07, 0xda, 0x06, 
+    0x83, 0x2e, 0xb5, 0xf7, 0x9b, 0xee, 0xef, 0x70, 0xe1, 0x5a, 0x07, 0x5c, 0xe8, 0xbb, 0x79, 0x77, 
+    0xe3, 0x94, 0x9b, 0x2e, 0xf4, 0x5f, 0x47, 0x40, 0xff, 0x95, 0x43, 0x6d, 0xde, 0x23, 0x39, 0x19, 
+    0xe7, 0xa1, 0xf4, 0x41, 0xb4, 0x03, 0xfd, 0xd4, 0x08, 0x68, 0x1b, 0xa4, 0x38, 0xd0, 0xcf, 0x88, 
+    0xa0, 0x7e, 0xd0, 0xb9, 0x79, 0x5b, 0x7f, 0x5b, 0x7f, 0xab, 0xf4, 0x61, 0x17, 0xc1, 0xbd, 0x08, 
+    0xea, 0x73, 0xed, 0x0b, 0x01, 0xb4, 0xe3, 0xc1, 0xaf, 0x08, 0x6a, 0x1b, 0xf0, 0xff, 0x05, 0xf1, 
+    0x16, 0xfa, 0xfc, 0x50, 0x31, 0xbe, 0x09, 0xfa, 0xfc, 0x0e, 0xcd, 0x67, 0xf3, 0x1b, 0x1c, 0x02, 
+    0x87, 0x4d, 0xd4, 0x28, 0xf9, 0xc3, 0x16, 0x7e, 0x83, 0x61, 0x25, 0xae, 0xc6, 0xc2, 0x7f, 0xc8, 
+    0xea, 0xda, 0x1d, 0xdc, 0x93, 0xc5, 0x4a, 0xdd, 0x1e, 0x9b, 0xb8, 0x1e, 0x25, 0xae, 0xd8, 0xad, 
+    0xce, 0xb6, 0xfe, 0x3f, 0xab, 0x7f, 0x42, 0xa9, 0xdb, 0x6d, 0x13, 0xa7, 0xfe, 0x67, 0x75, 0xdc, 
+    0x43, 0xfd, 0x1d, 0xa4, 0xbf, 0x27, 0xe2, 0x77, 0xfc, 0x47, 0x6d, 0xe2, 0x72, 0x49, 0xdf, 0xef, 
+    0x3e, 0xe2, 0x1c, 0x27, 0xb5, 0xb5, 0xe5, 0x42, 0x6d, 0x03, 0x93, 0x71, 0x9a, 0xd6, 0xe2, 0xd3, 
+    0x70, 0x11, 0x1a, 0x36, 0x42, 0xcd, 0xcb, 0x78, 0x0e, 0x60, 0x16, 0xf1, 0x9c, 0x6f, 0x30, 0x47, 
+    0x94, 0x60, 0xc7, 0x24, 0x51, 0xdc, 0x28, 0x51, 0x14, 0xc3, 0xc7, 0x5a, 0xeb, 0x47, 0xcd, 0x8a, 
+    0x3f, 0x05, 0x2f, 0x43, 0xb9, 0xce, 0x1e, 0x00, 0x00, 
+};
+const StaticFile favicon_ico PROGMEM = {(sizeof(favicon_ico_content)/sizeof(favicon_ico_content[0])), favicon_ico_content};
+
+}
diff --git a/platformio/relayctl/src/static.h b/platformio/relayctl/src/static.h
new file mode 100644
index 0000000..3273e68
--- /dev/null
+++ b/platformio/relayctl/src/static.h
@@ -0,0 +1,21 @@
+/**
+ * This file is autogenerated with make_static.sh script
+ */
+
+#pragma once
+
+#include <stdlib.h>
+
+namespace homekit::files {
+
+typedef struct {
+    size_t size;
+    const uint8_t* content;
+} StaticFile;
+
+extern const StaticFile index_html;
+extern const StaticFile app_js;
+extern const StaticFile style_css;
+extern const StaticFile favicon_ico;
+
+}
diff --git a/platformio/relayctl/src/stopwatch.h b/platformio/relayctl/src/stopwatch.h
new file mode 100644
index 0000000..bac2fcc
--- /dev/null
+++ b/platformio/relayctl/src/stopwatch.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <Arduino.h>
+
+namespace homekit {
+
+class StopWatch {
+private:
+    unsigned long time;
+
+public:
+    StopWatch() : time(0) {};
+
+    inline void save() {
+        time = millis();
+    }
+
+    inline bool elapsed(unsigned long ms) {
+        unsigned long now = millis();
+        if (now < time) {
+            // rollover?
+            time = now;
+        } else if (now - time >= ms) {
+            return true;
+        }
+        return false;
+    }
+};
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/wifi.cpp b/platformio/relayctl/src/wifi.cpp
new file mode 100644
index 0000000..b85d1dc
--- /dev/null
+++ b/platformio/relayctl/src/wifi.cpp
@@ -0,0 +1,49 @@
+#include "config.def.h"
+#include "wifi.h"
+#include "config.h"
+#include "logging.h"
+
+namespace homekit::wifi {
+
+using namespace homekit;
+using homekit::config::ConfigData;
+
+const char NODE_ID[] = DEFAULT_NODE_ID;
+const char WIFI_AP_SSID[] = DEFAULT_WIFI_AP_SSID;
+const char WIFI_STA_SSID[] = DEFAULT_WIFI_STA_SSID;
+const char WIFI_STA_PSK[] = DEFAULT_WIFI_STA_PSK;
+
+void getConfig(ConfigData& cfg, char** ssid_dst, char** psk_dst, char** hostname_dst) {
+    if (cfg.flags.wifi_configured) {
+        *ssid_dst = cfg.wifi_ssid;
+        *psk_dst = cfg.wifi_psk;
+        if (hostname_dst != nullptr)
+            *hostname_dst = cfg.node_id;
+    } else {
+        *ssid_dst = (char*)WIFI_STA_SSID;
+        *psk_dst = (char*)WIFI_STA_PSK;
+        if (hostname_dst != nullptr)
+            *hostname_dst = (char*)NODE_ID;
+    }
+}
+
+std::shared_ptr<std::list<ScanResult>> scan() {
+    if (WiFi.getMode() != WIFI_STA) {
+        PRINTLN("wifi::scan: switching mode to STA");
+        WiFi.mode(WIFI_STA);
+    }
+
+    std::shared_ptr<std::list<ScanResult>> results(new std::list<ScanResult>);
+    int count = WiFi.scanNetworks();
+    for (int i = 0; i < count; i++) {
+        results->push_back(ScanResult {
+            .rssi = WiFi.RSSI(i),
+            .ssid = WiFi.SSID(i)
+        });
+    }
+
+    WiFi.scanDelete();
+    return results;
+}
+
+}
\ No newline at end of file
diff --git a/platformio/relayctl/src/wifi.h b/platformio/relayctl/src/wifi.h
new file mode 100644
index 0000000..65dbd53
--- /dev/null
+++ b/platformio/relayctl/src/wifi.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <ESP8266WiFi.h>
+#include <list>
+#include <memory>
+#include "config.h"
+
+namespace homekit::wifi {
+
+using homekit::config::ConfigData;
+
+struct ScanResult {
+    int rssi;
+    String ssid;
+};
+
+void getConfig(ConfigData &cfg, char **ssid_dst, char **psk_dst, char **hostname_dst);
+std::shared_ptr<std::list<ScanResult>> scan();
+
+inline int8_t getRSSI() {
+    return WiFi.RSSI();
+}
+
+inline uint32_t getIPAsInteger() {
+    if (!WiFi.isConnected())
+        return 0;
+    return WiFi.localIP().v4();
+}
+
+extern const char WIFI_AP_SSID[];
+extern const char WIFI_STA_SSID[];
+extern const char WIFI_STA_PSK[];
+extern const char NODE_ID[];
+
+}
\ No newline at end of file