I've just acquired a Thunderboard Sense.
I downloaded the app from Google Play and it worked fine when I power the Thunderboard through USB.
But if I power the board only with battery it seems that the board could not be reached by app nor other BLE scanner.
I measured the voltage and it's 3.27 Volts.
Yes it works with battery, and that should work out of the box. Have you tried a different battery just to make sure that one is not somehow damaged?
Try pressing the buttons on the Thunderboard (is it Thunderboard Sense or Thunderboard Sense 2 ?)
If I remember correctly, the sample app will automatically go to deep sleep and shut off radio to save power. It wakes up when either of the buttons is pressed, advertises for a while and then goes back to hibernate.
@tmonte, I already tried another battery. What happens is the green led is blinking for a while. After that stops blinking.
@JaakkoV, when I press the buttons, the green led start to blink again.
I tried to scan using a scanner app and I got connect with the board, and see the services.
But the Thunderboard app could not find the device.
Are you using Android or iOS? Try to power cycle your phone and see if the board becomes visible on TB Sense app.
I'm using Android
After power cycle the board becomes visible.