Added Separate Timings for each Relay

The setting is saved on a file in:
/settings/relayTimings.json

Then during bootup, it's read and restored. 
Settings can be set via MQTT command on Topic: 
vesoer/*dev-id*/control/settings/relayTimers
using a json format. 
{ "b1":50, b2...}
where b1 is Bell 1, b2 Bell 2, etc..

functions.hpp

@@ -1,10 +1,15 @@
 #pragma once
 
 extern std::vector<uint16_t> melody_steps;
-
+extern uint16_t relayDurations[16];
 
 void setMelodyAttributes(JsonDocument doc);
 void loadMelodyInRAM(std::vector<uint16_t> &melody_steps);
+void loadRelayTimings();
+void saveRelayTimings();
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
 
 void setMelodyAttributes(JsonDocument doc){
 
@@ -68,3 +73,72 @@ void loadMelodyInRAM(std::vector<uint16_t> &melody_steps) {
 	// closing the file
 
 }
+
+void setRelayDurations(JsonDocument doc) {
+    // Iterate through the relays in the JSON payload
+    for (uint8_t i = 0; i < 16; i++) {
+        String key = String("b") + (i + 1); // Generate "b1", "b2", ...
+        if (doc.containsKey(key)) {
+            relayDurations[i] = doc[key].as<uint16_t>();
+            Serial.printf("Relay %d duration set to %d ms\n", i + 1, relayDurations[i]);
+        } else {
+            Serial.printf("Relay %d not found in JSON payload. Keeping previous duration: %d ms\n", i + 1, relayDurations[i]);
+        }
+    }
+		saveRelayTimings();
+}
+
+void saveRelayTimings() {
+    StaticJsonDocument<512> doc; // Adjust size if needed
+
+    // Populate the JSON object with relay durations
+    for (uint8_t i = 0; i < 16; i++) {
+        String key = String("b") + (i + 1);
+        doc[key] = relayDurations[i];
+    }
+
+    // Open the file for writing
+    File file = SPIFFS.open("/settings/relayTimings.json", FILE_WRITE);
+    if (!file) {
+        Serial.println("Failed to open file for writing");
+        return;
+    }
+
+    // Serialize JSON to the file
+    if (serializeJson(doc, file) == 0) {
+        Serial.println("Failed to write JSON to file");
+    } else {
+        Serial.println("Relay timings saved successfully");
+    }
+
+    file.close();
+}
+
+void loadRelayTimings() {
+    // Open the file for reading
+    File file = SPIFFS.open("/settings/relayTimings.json", FILE_READ);
+    if (!file) {
+        Serial.println("Settings file not found. Using default relay timings.");
+        return;
+    }
+
+    // Parse the JSON file
+    StaticJsonDocument<512> doc; // Adjust size if needed
+    DeserializationError error = deserializeJson(doc, file);
+    if (error) {
+        Serial.println("Failed to parse settings file. Using default relay timings.");
+        file.close();
+        return;
+    }
+
+    // Populate relayDurations array
+    for (uint8_t i = 0; i < 16; i++) {
+        String key = String("b") + (i + 1);
+        if (doc.containsKey(key)) {
+            relayDurations[i] = doc[key].as<uint16_t>();
+            Serial.printf("Loaded relay %d duration: %d ms\n", i + 1, relayDurations[i]);
+        }
+    }
+
+    file.close();
+}