Initial version that does nothing but replies to the /metrics endpoint

.gitignore

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+/build/
+/config.h

README.md

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+# Modular Weather Station
+
+## Compiling
+
+Copy the file `config.h.sample` to `config.h` and edit the parameters within.
+
+You can either compile the whole sketch from within the Arduino IDE or, if you are familiar with the CLI, you can use the official [Arduino CLI tools](https://arduino.github.io/arduino-cli/):
+
+```
+arduino-cli compile -b --fqbn esp8266:esp8266:nodemcuv2 /path/to/the/sketch /path/to/the/sketch/build
+```

WeatherStation.ino

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+/*
+ * ModularWeatherStation
+ *
+ * Copyright (C) 2021 Gergely Polonkai
+ * Author: Gergely POLONKAI <gergely@polonkai.eu>
+ *
+ * ModularWeatherStation is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * ModularWeatherStation is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+#include <ESP8266WiFi.h>
+#include <WiFiClient.h>
+#include <ESP8266mDNS.h>
+#include <ESP8266WebServer.h>
+
+#include "config.h"
+
+ESP8266WebServer server(80);
+
+static const char TEXT_PLAIN[] PROGMEM = "text/plain";
+
+void
+reply_not_found()
+{
+    server.send(404, FPSTR(TEXT_PLAIN), "Not Found");
+}
+
+void
+send_metrics()
+{
+    char message[1];
+
+    snprintf(message, 1, "");
+
+    server.send(200, "text/plain; version=0.0.4; charset=utf-8", message);
+}
+
+void
+setup()
+{
+    IPAddress address;
+
+    Serial.begin(9600);
+
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(WIFI_SSID, WIFI_PASS);
+
+    while (WiFi.status() != WL_CONNECTED) {
+        delay(500);
+        Serial.println("Waiting for WiFi to connect...");
+    }
+
+    address = WiFi.localIP();
+    Serial.print("WiFi Address: ");
+    address.printTo(Serial);
+    Serial.println("");
+
+    if (!MDNS.begin(MDNS_NAME)) {
+        Serial.println("Error setting up mDNS responder!");
+
+        while (1) {
+            delay(1000);
+        }
+    }
+
+    server.on("/metrics", HTTP_GET, send_metrics);
+    server.onNotFound(reply_not_found);
+
+    server.begin();
+
+    MDNS.addService("http", "tcp", 80);
+
+    Serial.println("All set, starting the loop.");
+}
+
+void
+loop()
+{
+    MDNS.update();
+    server.handleClient();
+}

config.h.sample

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+/*
+ * Configuration values for ModularWeatherStation
+ *
+ * Copyright (C) 2021 Gergely Polonkai
+ * Author: Gergely POLONKAI <gergely@polonkai.eu>
+ *
+ * ModularWeatherStation is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * ModularWeatherStation is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+// The SSID (name) and password of the WiFi network you want to connect to
+#define WIFI_SSID "YourWiFiName"
+#define WIFI_PASS "YourWiFiPass"
+
+// The mDNS hostname you want this station to be visible as.  This should be
+// different for each station you install (e.g. if you want to measure the
+// temperature and humidity of each room separately)
+#define MDNS_NAME "internal-hostname"