configure 24h format over MQTT

include/display.h

@@ -21,12 +21,13 @@ namespace Display {
   uint8_t brightness = BRIGHTNESS_NIGHT;
   int currentHour = -1;
   int currentMin = -1;
+  bool hourFormat24 = false;
 
   // Create display object
   Adafruit_7segment clockDisplay = Adafruit_7segment();
 
   void drawTime() {
-    int displayHour = hourFormat12();
+    int displayHour = hourFormat24 ? hour() : hourFormat12();
     int displayMinute = minute();
     int displayValue = displayHour * 100 + displayMinute;
 

include/ha.h

@@ -85,4 +85,13 @@ namespace Ha {
         jsonDoc["command_topic"] = topic;
         serializeJson(jsonDoc, output);
     }
+
+    void buildHourFormatConfig(char(&output)[JSON_SIZE], const char* topic) {
+        StaticJsonDocument<JSON_SIZE> jsonDoc;
+        buildDeviceConfig(jsonDoc);
+        jsonDoc["name"] = "ESP Clock Format 24h";
+        jsonDoc["unique_id"] = "esp_clock_format_24h";
+        jsonDoc["command_topic"] = topic;
+        serializeJson(jsonDoc, output);
+    }
 }

include/mqtt.h

@@ -37,6 +37,7 @@ namespace Mqtt {
     const char* bmpTopic = "homeassistant/sensor/esp_clock/state";
     const char* restartTopic = "homeassistant/button/esp_clock/restart";
     const char* ledTopic = "homeassistant/switch/esp_clock/led/set";
+    const char* hourFormatTopic = "homeassistant/switch/esp_clock/hour_format/set";
     const char* espClockTopic = "homeassistant/+/esp_clock/#";
 
     void connect() {
@@ -78,12 +79,19 @@ namespace Mqtt {
         client.publish("homeassistant/switch/esp_clock/led/config", 0, true, message);
     }
 
+    void publishHourFormatConfig() {
+        char message[JSON_SIZE];
+        Ha::buildHourFormatConfig(message, hourFormatTopic);
+        client.publish("homeassistant/switch/esp_clock/hour_format/config", 0, true, message);
+    }
+
     void publishConfig() {
         publishTempConfig();
         publishPressureConfig();
         publishAltitudeConfig();
         publishRestartConfig();
         publishLedConfig();
+        publishHourFormatConfig();
         ts.deleteTask(tPublishConfig);
     }
 
@@ -124,6 +132,15 @@ namespace Mqtt {
                 digitalWrite(LED_BUILTIN, HIGH);
             }
         }
+        if (String{ hourFormatTopic }.equals(topic)) {
+            if (String{ "ON" }.equals(msg)) {
+                Display::hourFormat24 = true;
+                Display::drawTime();
+            } else {
+                Display::hourFormat24 = false;
+                Display::drawTime();
+            }
+        }
     }
 
     void setup() {