text: bluetooth.onBluetoothConnected(function () {
      basic.showString("C")
  })
  bluetooth.onBluetoothDisconnected(function () {
      basic.showString("D")
  })
  input.onButtonPressed(Button.A, function () {
      bluetooth.uartWriteString("hello")
  })
  input.onButtonPressed(Button.B, function () {
      bluetooth.uartWriteString("goodbye")
  })
  bluetooth.startUartService()
  