Beginning of the common helper tools

RadDevice.cpp

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+#include <Arduino.h>
+#include <RadDevice.h>
+#include <EEPROM.h>
+
+String get_device_id() {
+    // device id is stored at pos 0 and is 6 bytes long.
+    EEPROM.begin(6);
+    String device_id;
+    for (int i=0 ; i < 6 ; i++) {
+        char f = EEPROM.read(i);
+        device_id += (f);
+    }
+    EEPROM.end();
+    return device_id;
+}

RadDevice.h

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+#pragma once
+
+#include <Arduino.h>
+
+String get_device_id();

RadHelpers.cpp

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+#include <Arduino.h>
+#include <PubSubClient.h>
+#include <RadConfig.h>
+
+String float_to_string(float value, int decimals) {
+    char c_value[10];
+    dtostrf(value, 1, decimals, c_value);
+    return c_value;
+}
+
+
+void mqtt_reconnect(PubSubClient &client, String dev_id, RadConfig config) {
+    Serial.println("[MQTT] Attempting MQTT connection...");
+    while (!client.connected()) {
+        if (client.connect(dev_id.c_str())) {
+            Serial.println("[MQTT] Connected");
+        }
+        else {
+            Serial.println("[MQTT] Failed, rc=" + String(client.state()));
+            delay(5000);
+        }
+    }
+}

RadHelpers.h

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+#pragma once
+
+#include <Arduino.h>
+#include <PubSubClient.h>
+#include <RadConfig.h>
+#include <RadLED.h>
+
+String float_to_string(float value, int decimals);
+
+void mqtt_reconnect(PubSubClient &client, String dev_id, RadConfig config);

RadLED.cpp

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+#include <Arduino.h>
+#include <RadLED.h>
+
+void LED_flash(int pin, int no_times, int on_ms, int off_ms) {
+    // When using the internal LED, the LOW and HIGH are around the wrong way. So:
+    // LOW = HIGH
+    // HIGH = LOW
+    int _LOW = LOW;
+    int _HIGH = HIGH;
+    if (pin == 2) {
+        _LOW = HIGH;
+        _HIGH = LOW;
+    }
+    for (int count=0; count < no_times; count++) {
+        digitalWrite(pin, LOW);
+        delay(on_ms);
+        digitalWrite(pin, HIGH);
+        delay(off_ms);
+    }
+}

RadLED.h

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+#pragma once
+
+#include <Arduino.h>
+
+void LED_flash(int pin, int no_times, int on_ms, int off_ms);

RadWifi.cpp

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+#include <Arduino.h>
+
+#include <RadConfig.h>
+#include <ESP8266WiFi.h>
+#include <RadLED.h>
+
+void setup_wifi(String device_id, RadConfig config) {
+
+    // The devices last digits of the IP are based on the last digits of the device id + a starting point.
+    int last_digits = device_id.substring(4, 6).toInt();
+    IPAddress this_ip(config.gateway[0], config.gateway[1], config.gateway[2], config.ip_start + last_digits);
+
+    // Turn off broadcoasting.
+    WiFi.mode(WIFI_STA);
+    // Set static IP
+    WiFi.config(this_ip, config.gateway_ip(), config.gateway_ip());
+    WiFi.hostname(device_id);
+    Serial.println("[WIFI] Connecting to '" + String(config.wifi_ssid));
+    WiFi.begin(config.wifi_ssid, config.wifi_password);
+
+    while (WiFi.status() != WL_CONNECTED) {
+        LED_flash(LED_BUILTIN, 3, 100, 100);
+        Serial.print(String(WiFi.status() + "."));
+    }
+    Serial.println("\n[WIFI] Connected!");
+
+    Serial.print("[WIFI] IP Address: ");
+    Serial.println(WiFi.localIP());
+}

RadWifi.h

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+#pragma once
+
+#include <Arduino.h>
+#include <RadConfig.h>
+#include <ESP8266WiFi.h>
+
+void setup_wifi(String device_id, RadConfig config);