Nano (funduino) won't constantly transmit

i'm have funduino nano hooked hc-06.
my code stupid simple , i'm not sure i'm doing wrong.

void setup() {
  serial.begin(9600);
  }

void loop() {
  int analogvalue = analogread(0);
      serial.print(analogvalue);
      delay(200);
  }


the nano transmits when ask ide serial monitor.
when close monitor , disconnect usb cable transmit stops (tx light stops flashing).

my hc-06 pairs , connects android device doesn't display anything.

suggestions?
thanks

try tutorial, maybe got solution...

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