public static WakeOnLan onIp(String ipStr) {
        WakeOnLan wakeOnLan = new WakeOnLan();
        wakeOnLan.ipStr = ipStr;
        return wakeOnLan;
    }
Set the ip address to wake

@param ipStr - IP Address to be woke
@return this object to allow chaining
library/src/main/java/com/stealthcopter/networktools/WakeOnLan.java