create 2 variants (env)

platformio.ini

@@ -8,11 +8,10 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
-[env:nodemcu-32s]
+[common]
 platform = espressif32
 board = nodemcu-32s
 framework = arduino
-upload_port = COM3
 upload_speed = 921600
 monitor_speed = 115200
 build_flags =
@@ -23,3 +22,17 @@ lib_deps =
     adafruit/Adafruit GFX Library@^1.12.4
     thingpulse/ESP8266 and ESP32 OLED driver for SSD1306 displays@^4.6.1
     knolleary/PubSubClient @ ^2.8
+
+[env:EG]
+extends = common
+upload_port = COM3
+build_flags =
+    ${common.build_flags}
+    -D VERSION_DG_ONLY=0
+
+[env:DG]
+extends = common
+upload_port = COM3
+build_flags =
+    ${common.build_flags}
+    -D VERSION_DG_ONLY=1

src/MyMqttClient.cpp

@@ -124,7 +124,7 @@ void MyMqttClient::onLoop()
             {
                 char payload[48];
                 snprintf(payload, sizeof(payload),
-                         "{\"event\":\"rssi\",\"rssi\":%d}", (int)WiFi.RSSI());
+                         "{\"event\":\"rssi\",\"rssi\":%d, \"variant\": \"" PROJECT_VARIANT "\" }", (int)WiFi.RSSI());
                 mqttClient.publish(MQTT_TOPIC_STATUS, payload);
             }
         }

src/main.h

@@ -22,7 +22,9 @@
 
 /* --------- SYMBOLIC CONSTANTS ---------*/
 
-#define VERSION_DG_ONLY       0
+#ifndef VERSION_DG_ONLY
+#define VERSION_DG_ONLY       0   /* default: EG — overridden by build environment */
+#endif
 
 #define VERSION_SMALL_DISPLAY 1