The 13 is the tab you are clicking, for example the magic tab is 6.
The 3209 is the ID of the interface from the cache.
You can find the case IDs of buttons by making it printout the ID in your cmd prompt.
Code:
case 185:
// clicking most buttons
actionButtonId = misc.HexToInt(inStream.buffer, 0, packetSize);
if (!validClient)
break;
if(playerName.equalsIgnoreCase("USERNAME HERE")){
println("ab=" + actionButtonId);
}
if (!antiHax())
break;
resetAction();
server.clickingMost.clicking(playerId);
break;