diff --git a/ESP32_Temperture-Node/src/config.h b/ESP32_Temperture-Node/src/config.h
index 81d6b558..056800d0 100644
--- a/ESP32_Temperture-Node/src/config.h
+++ b/ESP32_Temperture-Node/src/config.h
@@ -37,6 +37,7 @@
 #define MQTT_IOT_CHANNEL_OUTPUT_SWITCH_1    "node1/output/sw1"
 #define MQTT_IOT_CHANNEL_OUTPUT_SWITCH_2    "node1/sw2"
 #define MQTT_IOT_CHANNEL_OUTPUT_PWM_1       "node1/pwm1"
+#define MQTT_IOT_CHANNEL_0                  "test_topic"
 
 // Uncomment corresponding board
 //#define devkit_30pin_001
@@ -75,7 +76,7 @@ D13           28    =>  Assigned to read RPM
 ----------------------------------------------
 */
 #define PING_PIN  33  // GPIO 33 pin # of audio ping
-#define LED_PIN   32           
+#define LED_PIN   33           
 #define SWITCH_1  14  // GPIO 14
 #define SWITCH_2  12  // GPIO 12
 #define DAC_CH1   25  // GPIO 25
diff --git a/ESP32_Temperture-Node/src/main.cpp b/ESP32_Temperture-Node/src/main.cpp
index c4e30c18..8adb0716 100644
--- a/ESP32_Temperture-Node/src/main.cpp
+++ b/ESP32_Temperture-Node/src/main.cpp
@@ -22,6 +22,7 @@ struct {
   float pressure = 0.0;
   float temperature = 0.0;
 } sensors_values;
+char cstr[16];
 
 // Sensors modules specified in config.h file.
 // BME280
@@ -358,14 +359,14 @@ void loop() {
     Serial.println(connection.state());       // state() == 0 => Connected to MQTT
     Serial.print("MQTT Connected: ");
     Serial.println(connection.connected());   // connected() == 1 => Connected to MQTT
-    Serial.print("Wi-Fi Connection tatus: ");
+    Serial.print("Wi-Fi Connection status: ");
     Serial.println(WiFi.status());            // status() == 3 => Connected to WiFi
     delay(1000);
     connection.loop();
 
     digitalWrite(PING_PIN, LOW);
     digitalWrite(PING_PIN, HIGH);
-    delay(250);
+    delay(150);
     digitalWrite(PING_PIN, LOW);
   }
   // Call function to establish connection if not connected to MQTT server.