Bluno BLE serial comms opens only when USB port opens comms

Hello,
I have used the "BlunoTest" IOS xcode and the below analog voltage reader "ReadAnalogVoltage" example and the only time the app receives the information is when I start a USB serial connection with the BLUNO. Then the data shows up in the "received message" section of the BlunoTest code.

What am I doing wrong?

/*
ReadAnalogVoltage
Reads an analog input on pin 0, converts it to voltage, and prints the result to the serial monitor.
Graphical representation is available using serial plotter (Tools > Serial Plotter menu)
Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.

This example code is in the public domain.
*/

// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
float voltage = sensorValue * (5.0 / 1023.0);
// print out the value you read:
Serial.print(voltage);
Serial.print("V ");
delay(1000);
}
Regards,