JSON messages

{"sketchId":0}
{"sketchId":1}
{"sketchId":2, "r":0, "g":255, "b":0}
{"sketchId":3, "frequency":440, "duration":10}
{"sketchId":4, "text":"hello dublin"}
{"sketchId":5, "pattern":[16, 72, 8, 72, 16]}