extend config message with vers&lang

Author: sky3d

src/Cloud4RPi.cpp

@@ -185,6 +185,8 @@ void Cloud4RPi::setDiagVariable(const String& varName, const String& value) {
 bool Cloud4RPi::publishConfig() {
     DynamicJsonDocument doc(jsonBufferSize);
     JsonObject root = doc.to<JsonObject>();
+    root["v"] = VERSION;
+    root["l"] = LANG;
     JsonArray payload = root.createNestedArray("payload");
 
     for(int i = 0; i < variables->size(); i++) {

src/Cloud4RPi.h

@@ -27,6 +27,7 @@ namespace {
     const String& MQTT_SERVER = "mq.cloud4rpi.io";
     const int MQTT_PORT = 1883;
     const String& VERSION = "1.0.3";
+    const String& LANG = "ard";
 
     const String& VAR_TYPE_BOOL = "bool";
     const String& VAR_TYPE_NUMERIC = "numeric";