//send just calls JSON.stringify and then client.write using that string

//respond to a ping
state.client.send({
	type: 'rpc', id: 2,
	name: 'user.pong', args: []});

//join a room	
state.client.send({
	type: 'rpc', id: 1,
	name: 'room.join', args: [room]});
	
//woot a song (first args parameter is true for woot, false for meh)
state.client.send({type: 'rpc', id: 4,
name: 'room.cast', args: [true, state.data.room.historyID, true]});

You need to have a new id for every RPC call, can't use static ones.
Socket will respond to every rpc call, so you'll want some callback system based on ID.