I have a robot that I m controlling via a browser. A page with buttons to go forward, reverse, etc is written in PHP hosted on an onboard computer. The PHP is just sending ASCII characters over a serial connection to a microcontroller. Anyway, I need to implement a failsafe so that when the person driving it gets disconnected, the robot will stop. The only thing I can think to do is to ping the person on the web page or something, but I m sure there is a better way than that. The robot is connected either via an ad hoc network or a regular wireless network that is connected to the internet. Obviously if I go with the ping method then there will have to be a delay between the actual time disconnected and when it realizes it s been disconnected. I d like this delay to be a small as possible, whatever the method used. I d appreciate any ideas on how to do this.
Brute-force/DoS prevention in PHP [closed]
I am trying to write a script to prevent brute-force login attempts in a website I m building. The logic goes something like this: User sends login information. Check if username and password is ...