Fix pilight value as subject (#752)

* feat: pilight gateway now send value

* feat: when device id is empty, try fo find it from the message payload

main/ZgatewayPilight.ino

@@ -47,6 +47,22 @@ void pilightCallback(const String& protocol, const String& message, int status,
     RFPiLightdata.set("message", msg);
     RFPiLightdata.set("protocol", (char*)protocol.c_str());
     RFPiLightdata.set("length", (char*)deviceID.c_str());
+
+    const char* device_id = deviceID.c_str();
+    if (!strlen(device_id)) {
+      // deviceID returned from Pilight is only extracted from id field
+      // but some device may use another name as unique identifier
+      char* choices[] = {"key", "unit", "systemcode", "unitcode", "programcode"};
+
+      for (uint8_t i = 0; i < 5; i++) {
+        if (msg[choices[i]]) {
+          device_id = (const char*)msg[choices[i]];
+          break;
+        }
+      }
+    }
+
+    RFPiLightdata.set("value", device_id);
     RFPiLightdata.set("repeats", (int)repeats);
     RFPiLightdata.set("status", (int)status);
     pub(subjectPilighttoMQTT, RFPiLightdata);

main/main.ino

@@ -253,10 +253,17 @@ void pub(char* topicori, JsonObject& data) {
   if (client.connected()) {
     String topic = String(mqtt_topic) + String(topicori);
 #ifdef valueAsASubject
+#  ifdef ZgatewayPilight
+    String value = data["value"];
+    if (value != 0) {
+      topic = topic + "/" + value;
+    }
+#  else
     SIGNAL_SIZE_UL_ULL value = data["value"];
     if (value != 0) {
       topic = topic + "/" + String(value);
     }
+#  endif
 #endif
 
 #ifdef jsonPublishing