Thanks for reminding everyone of the link to the Open Sound Control Documentation. If you search for 'blob' in that document, you'll find:
⇐ /vcs,b |
{ byteCount, int_id0, float_value0, ... } |
Notification of change of value of one or more VCS widgets |
The Paca(rana) sends this message to your software (OSCulator in your case) if VCS notifications have been turned on and one or more VCS widgets have changed value. The blob argument contains big-endian data in the following format:
byteCount is a 32-bit integer (also big endian) that represents the size of the blob in bytes; byteCount / 8 is the number of EventID/value pairs in the blob. It doesn't look like you've included the full message, but from your shorthand (or OSCulator's shorthand), it appears to be the change in a single VCS widget (since 8/8 = 1).
int_id0, float_value0
After that, you should see a 32-bit integer followed by a float. The 32-bit integer is the EventID. And the 32-bit float is the new value of the widget. There could be additional EventID and value pairs, one pair for each widget that changed value, but in your case, it appears to be only one widget.