I want to subscribe to market depth updates using the streaming API https://en.bitcoin.it/wiki/MtGox/API/Streaming. I want to receive only depth updates for a particular symbol (EUR for example) or for all symbols. So I connect to wss://websocket.mtgox.com and send the command
{
"type": "depth",
"op": "mtgox.subscribe"
}
I'm expecting to receive depth updates for all symbols. But it sends me updates only for BTCUSD. Though the same subscribe command with parameter "type" = "trades" sends trades for all symbols (not only BTCUSD). That's a little confusing.
The currency parameter is mentioned in API documentation: websocket.mtgox.com:80/mtgox?Currency=EUR, but after connecting to this websocket I receive ticker updates as well. But I don't need ticker updates.
The question is how can I receive only market depth updates for particular symbol? (or all of symbols)