The "data" field seems to be the message I intended to submit, but the subscribe fails with "Unknown command". Any help would be appreciated.
my subscribtions (raw socket.io messages over websocket - no explicit frames borders) are:
"4:::{"op":"mtgox.subscribe","type":"trades"}"
"4:::{"op":"mtgox.subscribe","type":"ticker"}"
"4:::{"op":"mtgox.subscribe","type":"depth"}"