Getting raw Binary data from Blob

Hello!

I got a picture from my phone camera. It's coming to me like a Blob.

var blob = event.media;

The next thing I wanted to make is somehow get the binary data in string representation. The reason is following concatenating it with another data and forthcoming sending it to the server.

var data = "....some parameters....";
 
console.log(blob.toString()); // makes [object Ti Blob]
console.log(blob.getText()); // makes null

What should I do to make my plans true? Appreciate any help.