initial commit

.gitignore

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+.pio

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

include/SimpleUpdater.h

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+/*
+ * SimpleUpdater.h
+ *
+ * ESP8266 / ESP32 Environmental Sensor
+ *
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <xythobuz@xythobuz.de> wrote this file.  As long as you retain this notice
+ * you can do whatever you want with this stuff. If we meet some day, and you
+ * think this stuff is worth it, you can buy me a beer in return.   Thomas Buck
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef __ESP_SIMPLE_UPDATER__
+#define __ESP_SIMPLE_UPDATER__
+
+#if defined(ARDUINO_ARCH_ESP8266)
+#include <ESP8266WebServer.h>
+#include <ESP8266HTTPUpdateServer.h>
+#define UPDATE_WEB_SERVER ESP8266WebServer
+#elif defined(ARDUINO_ARCH_ESP32)
+#include <WebServer.h>
+#define UPDATE_WEB_SERVER WebServer
+#else
+#error Platform not supported!
+#endif
+
+class SimpleUpdater {
+public:
+    SimpleUpdater(String _uri = String("/update"));
+    void setup(UPDATE_WEB_SERVER *_server);
+    
+private:
+
+#if defined(ARDUINO_ARCH_ESP8266)
+    
+    ESP8266HTTPUpdateServer updateServer;
+
+#elif defined(ARDUINO_ARCH_ESP32)
+    
+    void get(void);
+    void postResult(void);
+    void postUpload(void);
+    
+#endif
+    
+    String uri;
+    UPDATE_WEB_SERVER *server;
+};
+
+#endif // __ESP_SIMPLE_UPDATER__
+

include/config.h

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+/*
+ * config.h
+ *
+ * ESP8266 / ESP32 Environmental Sensor
+ *
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <xythobuz@xythobuz.de> wrote this file.  As long as you retain this notice
+ * you can do whatever you want with this stuff. If we meet some day, and you
+ * think this stuff is worth it, you can buy me a beer in return.   Thomas Buck
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef __ESP_ENV_CONFIG__
+#define __ESP_ENV_CONFIG__
+
+// Sketch version
+const char* esp_relais_version = "0.1.0";
+
+// location of sensor, used in DB and hostname
+//const char* sensor_location = "livingroom";
+//const char* sensor_location = "bedroom";
+const char* sensor_location = "bathroom";
+//const char* sensor_location = "kitchen";
+//const char* sensor_location = "hallway";
+//const char* sensor_location = "tent";
+//const char* sensor_location = "storage";
+//const char* sensor_location = "greenhouse";
+//const char* sensor_location = "test";
+
+#define SENSOR_HOSTNAME_PREFIX "relais-"
+
+// WiFi AP settings
+const char* ssid = "INSERT_SSID_HERE";
+const char* password = "INSERT_PASSPHRASE_HERE";
+
+// MQTT settings
+#define MQTT_HOST "10.23.42.14"
+#define MQTT_PORT 1883
+
+// InfluxDB settings
+#define INFLUXDB_HOST "10.23.42.14"
+#define INFLUXDB_PORT 8086
+#define INFLUXDB_DATABASE "roomsensorsdiy"
+
+// feature selection
+//#define ENABLE_MQTT
+//#define ENABLE_INFLUXDB_LOGGING
+#define ENABLE_NTP
+
+// all given in milliseconds
+#define SERVER_HANDLE_INTERVAL 10
+#define AUTO_TIMING_INTERVAL (15UL * 60UL * 1000UL)
+#define LED_BLINK_INTERVAL (2 * 1000)
+#define LED_INIT_BLINK_INTERVAL 500
+#define LED_CONNECT_BLINK_INTERVAL 250
+#define LED_ERROR_BLINK_INTERVAL 100
+
+#if defined(ARDUINO_ARCH_ESP8266)
+
+#define RELAIS_COUNT 4
+#define ESP_PLATFORM_NAME "ESP8266"
+
+#elif defined(ARDUINO_ARCH_ESP32)
+
+#define RELAIS_COUNT 10
+#define ESP_PLATFORM_NAME "ESP32"
+
+#endif
+
+#endif // __ESP_ENV_CONFIG__
+

include/relais.h

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+/*
+ * relais.h
+ *
+ * ESP8266 / ESP32 Environmental Sensor
+ *
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <xythobuz@xythobuz.de> wrote this file.  As long as you retain this notice
+ * you can do whatever you want with this stuff. If we meet some day, and you
+ * think this stuff is worth it, you can buy me a beer in return.   Thomas Buck
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef __ESP_RELAIS_ACTOR__
+#define __ESP_RELAIS_ACTOR__
+
+int relais_count(void);
+void relais_set(int relais, int state);
+void relais_init(void);
+
+#endif // __ESP_RELAIS_ACTOR__

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+;PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp8266]
+platform = espressif8266
+board = esp01_1m
+framework = arduino
+lib_deps =
+    ESP8266 Influxdb
+    https://github.com/knolleary/pubsubclient.git#2d228f2f862a95846c65a8518c79f48dfc8f188c
+    https://github.com/arduino-libraries/NTPClient
+
+[env:esp32]
+platform = espressif32
+board = esp32dev
+framework = arduino
+upload_protocol = esptool
+lib_deps =
+    https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino.git#66ed5d031caab6953cc79b407a4b49d33b1126dc
+    https://github.com/knolleary/pubsubclient.git#2d228f2f862a95846c65a8518c79f48dfc8f188c
+    https://github.com/arduino-libraries/NTPClient
+

src/SimpleUpdater.cpp

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+/*
+ * SimpleUpdater.cpp
+ *
+ * ESP8266 / ESP32 Environmental Sensor
+ *
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <xythobuz@xythobuz.de> wrote this file.  As long as you retain this notice
+ * you can do whatever you want with this stuff. If we meet some day, and you
+ * think this stuff is worth it, you can buy me a beer in return.   Thomas Buck
+ * ----------------------------------------------------------------------------
+ */
+
+#if defined(ARDUINO_ARCH_ESP8266)
+#include <ESP8266HTTPUpdateServer.h>
+#elif defined(ARDUINO_ARCH_ESP32)
+#include <Update.h>
+#endif
+
+#include "SimpleUpdater.h"
+
+#if defined(ARDUINO_ARCH_ESP32)
+
+void SimpleUpdater::get(void) {
+    String uploadPage = F(
+        "<html><head>"
+        "<script src='https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js'></script>"
+        "<title>SimpleUpdater ESP32</title>"
+        "</head><body>"
+        "<h1>SimpleUpdater</h1>"
+        "<form method='POST' action='#' enctype='multipart/form-data' id='upload_form'>"
+        "<input type='file' name='update'>"
+        "<input type='submit' value='Update'>"
+        "</form>"
+        "<div id='prg'>progress: 0%</div>"
+        "<a href=\"/\">Back to Main Page</a>"
+        "<script>"
+        "$('form').submit(function(e){"
+        "e.preventDefault();"
+        "var form = $('#upload_form')[0];"
+        "var data = new FormData(form);"
+        " $.ajax({"
+        "url: '/update',"
+        "type: 'POST',"
+        "data: data,"
+        "contentType: false,"
+        "processData:false,"
+        "xhr: function() {"
+        "var xhr = new window.XMLHttpRequest();"
+        "xhr.upload.addEventListener('progress', function(evt) {"
+        "if (evt.lengthComputable) {"
+        "var per = evt.loaded / evt.total;"
+        "$('#prg').html('progress: ' + Math.round(per*100) + '%');"
+        "}"
+        "}, false);"
+        "return xhr;"
+        "},"
+        "success:function(d, s) {"
+        "console.log('success!')" 
+        "},"
+        "error: function (a, b, c) {"
+        "}"
+        "});"
+        "});"
+        "</script>"
+        "</body></html>"
+    );
+    
+    server->send(200, "text/html", uploadPage);
+}
+
+void SimpleUpdater::postResult(void) {
+    server->sendHeader("Connection", "close");
+    server->send(200, "text/plain", (Update.hasError()) ? "FAIL" : "OK");
+    ESP.restart();
+}
+
+void SimpleUpdater::postUpload(void) {
+    HTTPUpload& upload = server->upload();
+    if (upload.status == UPLOAD_FILE_START) {
+        Serial.printf("Update: %s\n", upload.filename.c_str());
+        // start with max available size
+        if (!Update.begin(UPDATE_SIZE_UNKNOWN)) {
+            Update.printError(Serial);
+        }
+    } else if (upload.status == UPLOAD_FILE_WRITE) {
+        // flashing firmware to ESP
+        if (Update.write(upload.buf, upload.currentSize) != upload.currentSize) {
+            Update.printError(Serial);
+        }
+    } else if (upload.status == UPLOAD_FILE_END) {
+        // true to set the size to the current progress
+        if (Update.end(true)) {
+            Serial.printf("Update Success: %u\nRebooting...\n", upload.totalSize);
+        } else {
+            Update.printError(Serial);
+        }
+    }
+}
+
+#endif
+
+void SimpleUpdater::setup(UPDATE_WEB_SERVER *_server) {
+    if (_server == NULL) {
+        return;
+    }
+    
+    server = _server;
+    
+#if defined(ARDUINO_ARCH_ESP8266)
+    
+    updateServer.setup(server);
+    
+#elif defined(ARDUINO_ARCH_ESP32)
+    
+    server->on(uri.c_str(), HTTP_POST, [this]() {
+        postResult();
+    }, [this]() {
+        postUpload();
+    });
+    
+    server->on(uri.c_str(), HTTP_GET, [this]() {
+        get();
+    });
+    
+#endif
+}
+
+SimpleUpdater::SimpleUpdater(String _uri) {
+    uri = _uri;
+    server = NULL;
+}
+

src/main.cpp

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+/*
+ * main.cpp
+ *
+ * ESP8266 / ESP32 Environmental Sensor
+ *
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <xythobuz@xythobuz.de> wrote this file.  As long as you retain this notice
+ * you can do whatever you want with this stuff. If we meet some day, and you
+ * think this stuff is worth it, you can buy me a beer in return.   Thomas Buck
+ * ----------------------------------------------------------------------------
+ */
+
+#include <Arduino.h>
+#include <Wire.h>
+#include <PubSubClient.h>
+
+#if defined(ARDUINO_ARCH_ESP8266)
+
+#include <ESP8266WiFi.h>
+#include <ESP8266WebServer.h>
+#include <ESP8266mDNS.h>
+
+#elif defined(ARDUINO_ARCH_ESP32)
+
+#include <WiFi.h>
+#include <WebServer.h>
+#include <ESPmDNS.h>
+
+#endif
+
+#include "config.h"
+#include "relais.h"
+#include "SimpleUpdater.h"
+
+#define BUILTIN_LED_PIN 1
+
+UPDATE_WEB_SERVER server(80);
+SimpleUpdater updater;
+
+#ifdef ENABLE_MQTT
+WiFiClient mqttClient;
+PubSubClient mqtt(mqttClient);
+#endif // ENABLE_MQTT
+
+#ifdef ENABLE_INFLUXDB_LOGGING
+#include <InfluxDb.h>
+
+Influxdb influx(INFLUXDB_HOST, INFLUXDB_PORT);
+
+#define INFLUX_MAX_ERRORS_RESET 10
+int error_count = 0;
+#endif // ENABLE_INFLUXDB_LOGGING
+
+#ifdef ENABLE_NTP
+#include <WiFiUdp.h>
+#include <NTPClient.h>
+
+WiFiUDP ntpUDP;
+NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 2 * 60 * 60, 5 * 60 * 1000);
+#endif // ENABLE_NTP
+
+unsigned long last_server_handle_time = 0;
+unsigned long last_db_write_time = 0;
+unsigned long last_led_blink_time = 0;
+unsigned long last_timing_check_time = 0;
+
+String relais_name[RELAIS_COUNT] = {
+    String(" (Small Light)"),
+    String(" (Big Light)"),
+    String(""),
+    String(" (Fan)"),
+};
+
+bool relais_state[RELAIS_COUNT] = { false, false, false, false };
+String auto_set_state = String("");
+
+#ifdef ENABLE_NTP
+void handleAutoTimingCheck(void) {
+    relais_state[3] = true; // always keep fan on
+
+    if ((timeClient.getHours() >= 20) || (timeClient.getHours() < 10)) {
+        // small light from 20:00 to 10:00
+        relais_state[0] = true;
+        relais_state[1] = false;
+        auto_set_state = F("Small Light at Night (") + timeClient.getFormattedTime() + F(")");
+    } else {
+        // big light from 10:00 to 20:00
+        relais_state[0] = false;
+        relais_state[1] = true;
+        auto_set_state = F("Big Light while Daylight (") + timeClient.getFormattedTime() + F(")");
+    }
+
+    for (int i = 0; i < RELAIS_COUNT; i++) {
+        relais_set(i, relais_state[i] ? 1 : 0);
+    }
+}
+#endif // ENABLE_NTP
+
+void handlePage(int mode = -1, int id = 0) {
+    String message = F("<html><head>\n");
+    message += F("<title>" ESP_PLATFORM_NAME " MQTT Relais</title>\n");
+    message += F("</head><body>\n");
+    message += F("<h1>" ESP_PLATFORM_NAME " MQTT Relais</h1>\n");
+
+    message += F("\n<p>\n");
+    for (int i = 0; i < RELAIS_COUNT; i++) {
+        message += String(F("<a href=\"/on?id=")) + String(i) + String(F("\">Relais ")) + String(i) + String(F(" On")) + relais_name[i] + String(F("</a><br>\n"));
+        message += String(F("<a href=\"/off?id=")) + String(i) + String(F("\">Relais ")) + String(i) + String(F(" Off")) + relais_name[i] + String(F("</a><br>\n"));
+    }
+    message += String(F("<a href=\"/on?id=")) + String(RELAIS_COUNT) + String(F("\">All Relais On</a><br>\n"));
+    message += String(F("<a href=\"/off?id=")) + String(RELAIS_COUNT) + String(F("\">All Relais Off</a><br>\n"));
+    message += F("</p>\n");
+
+    if (mode >= 0) {
+        message += F("<p>");
+        message += F("Turned Relais ");
+        message += (id < RELAIS_COUNT) ? String(id) : String(F("1-4"));
+        message += (mode ? String(F(" On")) : String(F(" Off")));
+        message += F("</p>\n");
+    }
+
+    message += F("\n<p>\n");
+    for (int i = 0; i < RELAIS_COUNT; i++) {
+        message += String(F("Relais ")) + String(i) + String(F(" = ")) + (relais_state[i] ? String(F("On")) : String(F("Off"))) + String(F("<br>\n"));
+    }
+    message += F("</p>\n");
+
+#ifdef ENABLE_NTP
+    message += F("<p>Time from NTP: ");
+    message += timeClient.getFormattedTime();
+    message += F("</p>\n");
+
+    message += F("<p>Auto-State: ");
+    message += auto_set_state;
+    message += F("</p>\n");
+
+    unsigned long next_min = (AUTO_TIMING_INTERVAL - (millis() - last_timing_check_time)) / (1000 * 60);
+    message += F("<p>Next Auto-State in ");
+    message += String(next_min);
+    message += F("min</p>\n");
+#endif // ENABLE_NTP
+
+    message += F("\n<p>\n");
+    message += F("Version: ");
+    message += esp_relais_version;
+    message += F("\n<br>\n");
+    message += F("Location: ");
+    message += sensor_location;
+    message += F("\n<br>\n");
+    message += F("MAC: ");
+    message += WiFi.macAddress();
+    message += F("\n</p>\n");
+
+#if defined(ARDUINO_ARCH_ESP8266)
+    
+    message += F("\n<p>\n");
+    message += F("Reset reason: ");
+    message += ESP.getResetReason();
+    message += F("\n<br>\n");
+    message += F("Free heap: ");
+    message += String(ESP.getFreeHeap());
+    message += F(" (");
+    message += String(ESP.getHeapFragmentation());
+    message += F("% fragmentation)");
+    message += F("\n<br>\n");
+    message += F("Free sketch space: ");
+    message += String(ESP.getFreeSketchSpace());
+    message += F("\n<br>\n");
+    message += F("Flash chip real size: ");
+    message += String(ESP.getFlashChipRealSize());
+
+    if (ESP.getFlashChipSize() != ESP.getFlashChipRealSize()) {
+        message += F("\n<br>\n");
+        message += F("WARNING: sdk chip size (");
+        message += (ESP.getFlashChipSize());
+        message += F(") does not match!");
+    }
+    
+    message += F("\n</p>\n");
+    
+#elif defined(ARDUINO_ARCH_ESP32)
+
+    message += F("\n<p>\n");
+    message += F("Free heap: ");
+    message += String(ESP.getFreeHeap() / 1024.0);
+    message += F("k\n<br>\n");
+    message += F("Free sketch space: ");
+    message += String(ESP.getFreeSketchSpace() / 1024.0);
+    message += F("k\n<br>\n");
+    message += F("Flash chip size: ");
+    message += String(ESP.getFlashChipSize() / 1024.0);
+    message += F("k\n</p>\n");
+    
+#endif
+
+    message += F("<p>\n");
+    message += F("Try <a href=\"/update\">/update</a> for OTA firmware updates!\n");
+    message += F("</p>\n");
+    
+    message += F("<p>\n");
+#ifdef ENABLE_INFLUXDB_LOGGING
+    message += F("InfluxDB: ");
+    message += INFLUXDB_DATABASE;
+    message += F(" @ ");
+    message += INFLUXDB_HOST;
+    message += F(":");
+    message += String(INFLUXDB_PORT);
+    message += F("\n");
+#else
+    message += F("InfluxDB logging not enabled!\n");
+#endif
+    message += F("</p>\n");
+
+    message += F("</body></html>\n");
+    server.send(200, "text/html", message);
+}
+
+void handleOn() {
+    String id_string = server.arg("id");
+    int id = id_string.toInt();
+
+    if ((id >= 0) && (id < RELAIS_COUNT)) {
+        relais_set(id, 1);
+        relais_state[id] = true;
+    } else {
+        for (int i = 0; i < RELAIS_COUNT; i++) {
+            relais_set(i, 1);
+            relais_state[i] = true;
+        }
+    }
+
+    // only reset to default after 15min
+    last_timing_check_time = millis();
+
+    handlePage(1, id);
+}
+
+void handleOff() {
+    String id_string = server.arg("id");
+    int id = id_string.toInt();
+
+    if ((id >= 0) && (id < RELAIS_COUNT)) {
+        relais_set(id, 0);
+        relais_state[id] = false;
+    } else {
+        for (int i = 0; i < RELAIS_COUNT; i++) {
+            relais_set(i, 0);
+            relais_state[i] = false;
+        }
+    }
+
+    // only reset to default after 15min
+    last_timing_check_time = millis();
+
+    handlePage(0, id);
+}
+
+void handleRoot() {
+    handlePage();
+}
+
+#ifdef ENABLE_MQTT
+void mqttCallback(char* topic, byte* payload, unsigned int length) {
+    int state = 0;
+    int id = 0;
+
+    // TODO check topic matches
+
+    if (((char)payload[0] == 't')
+            && ((char)payload[1] == 'u')
+            && ((char)payload[2] == 'r')
+            && ((char)payload[3] == 'n')
+            && ((char)payload[4] == ' ')
+            && ((char)payload[5] == 'o')) {
+        if (((char)payload[6] == 'n')
+            && ((char)payload[7] == ' ')) {
+            // turn on
+            state = 1;
+            id = payload[8];
+        } else if (((char)payload[6] == 'f')
+                && ((char)payload[7] == 'f')
+                && ((char)payload[8] == ' ')) {
+            // turn off
+            state = 0;
+            id = payload[9];
+        } else {
+            return;
+        }
+    } else {
+        return;
+    }
+
+    relais_set(id - 1, state);
+    relais_state[id - 1] = state ? true : false;
+}
+
+void mqttReconnect() {
+    // Loop until we're reconnected
+    //while (!mqtt.connected()) {
+        // Create a random client ID
+        String clientId = "ESP8266Client-";
+        clientId += String(random(0xffff), HEX);
+
+        // Attempt to connect
+        if (mqtt.connect(clientId.c_str())) {
+            // Once connected, publish an announcement...
+            //mqtt.publish("outTopic", "hello world");
+            // ... and resubscribe
+            mqtt.subscribe(sensor_location);
+        } else {
+            // Wait 5 seconds before retrying
+            delay(5000);
+        }
+    //}
+}
+#endif // ENABLE_MQTT
+
+void setup() {
+    pinMode(BUILTIN_LED_PIN, OUTPUT);
+    
+    relais_init();
+
+    for (int i = 0; i < RELAIS_COUNT; i++) {
+        relais_state[i] = false;
+    }
+
+    Serial.println();
+    Serial.println("Hello World From Relais Test");
+
+    // Blink LED for init
+    for (int i = 0; i < 2; i++) {
+        digitalWrite(BUILTIN_LED_PIN, LOW); // LED on
+        delay(LED_INIT_BLINK_INTERVAL);
+        digitalWrite(BUILTIN_LED_PIN, HIGH); // LED off
+        delay(LED_INIT_BLINK_INTERVAL);
+    }
+
+    // Build hostname string
+    String hostname = SENSOR_HOSTNAME_PREFIX;
+    hostname += sensor_location;
+
+#if defined(ARDUINO_ARCH_ESP8266)
+
+    // Connect to WiFi AP
+    Serial.print("Connecting to WiFi");
+    WiFi.hostname(hostname);
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(ssid, password);
+    while (WiFi.status() != WL_CONNECTED) {
+        Serial.print(".");
+        delay(LED_CONNECT_BLINK_INTERVAL);
+        digitalWrite(BUILTIN_LED_PIN, !digitalRead(BUILTIN_LED_PIN));
+    }
+    Serial.println();
+    
+#elif defined(ARDUINO_ARCH_ESP32)
+
+    // Set hostname workaround
+    WiFi.config(INADDR_NONE, INADDR_NONE, INADDR_NONE);
+    WiFi.setHostname(hostname.c_str());
+    
+    // Workaround for WiFi connecting only every 2nd reset
+    // https://github.com/espressif/arduino-esp32/issues/2501#issuecomment-513602522
+    WiFi.onEvent([](WiFiEvent_t event, WiFiEventInfo_t info) {
+        if (info.disconnected.reason == 202) {
+            esp_sleep_enable_timer_wakeup(10);
+            esp_deep_sleep_start();
+            delay(100);
+        }
+    }, WiFiEvent_t::SYSTEM_EVENT_STA_DISCONNECTED);
+
+    // Connect to WiFi AP
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(ssid, password);
+    while (WiFi.status() != WL_CONNECTED) {
+        delay(LED_CONNECT_BLINK_INTERVAL);
+        digitalWrite(BUILTIN_LED_PIN, !digitalRead(BUILTIN_LED_PIN));
+    }
+    
+    // Set hostname workaround
+    WiFi.setHostname(hostname.c_str());
+
+#endif
+
+    Serial.println("Seeding");
+    randomSeed(micros());
+
+#ifdef ENABLE_MQTT
+    Serial.println("MQTT");
+    mqtt.setServer(MQTT_HOST, MQTT_PORT);
+    mqtt.setCallback(mqttCallback);
+#endif // ENABLE_MQTT
+
+#ifdef ENABLE_INFLUXDB_LOGGING
+    // Setup InfluxDB Client
+    influx.setDb(INFLUXDB_DATABASE);
+#endif // ENABLE_INFLUXDB_LOGGING
+
+#ifdef ENABLE_NTP
+    timeClient.begin();
+#endif // ENABLE_NTP
+
+    // Setup HTTP Server
+    Serial.println("Server");
+    MDNS.begin(hostname.c_str());
+    updater.setup(&server);
+    server.on("/", handleRoot);
+    server.on("/on", handleOn);
+    server.on("/off", handleOff);
+    server.begin();
+    MDNS.addService("http", "tcp", 80);
+
+    Serial.println("Done");
+}
+
+void handleServers() {
+    server.handleClient();
+    
+#if defined(ARDUINO_ARCH_ESP8266)
+    MDNS.update();
+#endif
+}
+
+#ifdef ENABLE_INFLUXDB_LOGGING
+static boolean writeMeasurement(InfluxData &measurement) {
+    boolean success = influx.write(measurement);
+    if (!success) {
+        error_count++;
+        for (int i = 0; i < 10; i++) {
+            digitalWrite(BUILTIN_LED_PIN, LOW); // LED on
+            delay(LED_ERROR_BLINK_INTERVAL);
+            digitalWrite(BUILTIN_LED_PIN, HIGH); // LED off
+            delay(LED_ERROR_BLINK_INTERVAL);
+        }
+    }
+    return success;
+}
+
+void writeDatabase() {
+    if (found_bme1) {
+        InfluxData measurement("environment");
+        measurement.addTag("location", sensor_location);
+        measurement.addTag("placement", "1");
+        measurement.addTag("device", WiFi.macAddress());
+        measurement.addTag("sensor", "bme280");
+
+        measurement.addValue("temperature", bme1_temp());
+        measurement.addValue("pressure", bme1_pressure());
+        measurement.addValue("humidity", bme1_humid());
+
+        writeMeasurement(measurement);
+    }
+    if (found_bme2) {
+        InfluxData measurement("environment");
+        measurement.addTag("location", sensor_location);
+        measurement.addTag("placement", "2");
+        measurement.addTag("device", WiFi.macAddress());
+        measurement.addTag("sensor", "bme280");
+
+        measurement.addValue("temperature", bme2_temp());
+        measurement.addValue("pressure", bme2_pressure());
+        measurement.addValue("humidity", bme2_humid());
+
+        writeMeasurement(measurement);
+    }
+
+    if (found_sht) {
+        InfluxData measurement("environment");
+        measurement.addTag("location", sensor_location);
+        measurement.addTag("device", WiFi.macAddress());
+        measurement.addTag("sensor", "sht21");
+
+        measurement.addValue("temperature", sht_temp());
+        measurement.addValue("humidity", sht_humid());
+
+        writeMeasurement(measurement);
+    }
+    
+    for (int i = 0; i < moisture_count(); i++) {
+        int moisture = moisture_read(i);
+        if (moisture < moisture_max()) {
+            InfluxData measurement("moisture");
+            measurement.addTag("location", sensor_location);
+            measurement.addTag("device", WiFi.macAddress());
+            measurement.addTag("sensor", String(i + 1));
+
+            measurement.addValue("value", moisture);
+            measurement.addValue("maximum", moisture_max());
+
+            writeMeasurement(measurement);
+        }
+    }
+}
+#endif // ENABLE_INFLUXDB_LOGGING
+
+void loop() {
+    if ((millis() - last_server_handle_time) >= SERVER_HANDLE_INTERVAL) {
+        last_server_handle_time = millis();
+        handleServers();
+    }
+
+#ifdef ENABLE_NTP
+    timeClient.update();
+
+    if (timeClient.isTimeSet()) {
+        if (((millis() - last_timing_check_time) >= AUTO_TIMING_INTERVAL) || (last_timing_check_time == 0)) {
+            last_timing_check_time = millis();
+            handleAutoTimingCheck();
+        }
+    }
+#endif // ENABLE_NTP
+
+#ifdef ENABLE_MQTT
+    if (!mqtt.connected()) {
+        mqttReconnect();
+    }
+    mqtt.loop();
+#endif // ENABLE_MQTT
+
+#ifdef ENABLE_INFLUXDB_LOGGING
+    if ((millis() - last_db_write_time) >= DB_WRITE_INTERVAL) {
+        last_db_write_time = millis();
+        writeDatabase();
+    }
+    
+#ifdef INFLUX_MAX_ERRORS_RESET
+    if (error_count >= INFLUX_MAX_ERRORS_RESET) {
+        ESP.restart();
+    }
+#endif // INFLUX_MAX_ERRORS_RESET
+#endif // ENABLE_INFLUXDB_LOGGING
+
+    // blink heartbeat LED
+    if ((millis() - last_led_blink_time) >= LED_BLINK_INTERVAL) {
+        last_led_blink_time = millis();
+        digitalWrite(BUILTIN_LED_PIN, !digitalRead(BUILTIN_LED_PIN));
+    }
+    
+    // reset ESP every 6h to be safe
+    if (millis() >= (6 * 60 * 60 * 1000)) {
+        ESP.restart();
+    }
+}
+

src/relais.cpp

@@ -0,0 +1,90 @@
+/*
+ * relais.cpp
+ *
+ * ESP8266 / ESP32 Environmental Sensor
+ *
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <xythobuz@xythobuz.de> wrote this file.  As long as you retain this notice
+ * you can do whatever you want with this stuff. If we meet some day, and you
+ * think this stuff is worth it, you can buy me a beer in return.   Thomas Buck
+ * ----------------------------------------------------------------------------
+ */
+
+#include <Arduino.h>
+#include "relais.h"
+
+#if defined(ARDUINO_ARCH_ESP8266)
+
+/*
+Turn OFF the first relay  : A0 01 00 A1
+Turn ON the first relay   : A0 01 01 A2
+Turn OFF the second relay : A0 02 00 A2
+Turn ON the second relay  : A0 02 01 A3
+Turn OFF the third relay  : A0 03 00 A3
+Turn ON the third relay   : A0 03 01 A4
+Turn OFF the fourth relay : A0 04 00 A4
+Turn ON the fourth relay  : A0 04 01 A5
+*/
+
+void relais_set(int relais, int state) {
+    if ((relais < 0) || (relais >= RELAIS_COUNT)) {
+        return;
+    }
+
+    int cmd[4];
+    cmd[0] = 0xA0; // command
+
+    cmd[1] = relais + 1; // relais id, 1-4
+    cmd[2] = state ? 1 : 0; // relais state
+
+    cmd[3] = 0; // checksum
+    for (int i = 0; i < 3; i++) {
+        cmd[3] += cmd[i];
+    }
+
+    for (int i = 0; i < 4; i++) {
+        Serial.write(cmd[i]);
+    }
+
+    delay(100);
+}
+
+void relais_init(void) {
+#if RELAIS_COUNT > 0
+    Serial.begin(115200);
+#endif
+
+    for (int i = 0; i < RELAIS_COUNT; i++) {
+        relais_set(i, 0);
+    }
+}
+
+#elif defined(ARDUINO_ARCH_ESP32)
+
+static int gpios[RELAIS_COUNT] = {
+    0, 15, 2, 4,
+    16, 17, 5, 18,
+    19, 23
+};
+
+void relais_set(int relais, int state) {
+    if ((relais < 0) || (relais >= RELAIS_COUNT)) {
+        return;
+    }
+
+    digitalWrite(gpios[relais], state ? LOW : HIGH);
+}
+
+void relais_init(void) {
+    for (int i = 0; i < RELAIS_COUNT; i++) {
+        pinMode(gpios[i], OUTPUT);
+        relais_set(i, 0);
+    }
+}
+
+#endif
+
+int relais_count(void) {
+    return RELAIS_COUNT;
+}