Upload each picture as it is taken

App.js

// Here's the timer code, lifted from takePicture:
queuePhoto = () => {
  // In 27 seconds, turn the camera back on
  setTimeout(() => {
    this.setState({ photo: null });
  }, PHOTO_INTERVAL - FOCUS_TIME);

  // In 30 seconds, take the next picture
  setTimeout(this.takePicture, PHOTO_INTERVAL);
}

// Take the picture, upload it, and
// then queue up the next one
takePicture = () => {
  this.camera.takePictureAsync({
    quality: 0.1,
    base64: true,
    exif: false
  }).then(photo => {
    this.setState({ photo }, () => {
      this.uploadPicture()
        .then(this.queuePhoto)
        .catch(this.queuePhoto);
    });
  });
}