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I have an Apache server running on one Pi and also hosts a PHP script that gives the Raspistill command to take a photo. After running through the problems of permissions, I finally got the Pi to take a photo through the web browser. I now want to expand this function, so that every Pi connected on the network takes a photo when I go to the browser to run the PHP script. I am new to networking, so I'm not sure how to go about doing this. Is there a way for me to broadcast this command simultaneously across the network to the specific IP addresses of the Pis? I have heard of UDP broadcasting using sockets but I'm not sure how that will fit in here. Any help is appreciated, thanks.

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Apache is an HTTP server, and there's no such thing as HTTP over UDP, so UDP broadcasting won't help. Just run a single Apache instance and write a PHP script which talks to several Raspistill instances over the network.

  • How would I talk to several Raspistill instances? Is there a way to connect to specific IP addresses on PHP? Can you elaborate please? – D P Jul 27 '17 at 6:50
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Some thing like this is worth a try,not too difficult. From the main RPi, get a list of all the units that you expect to run the command/script/process. Configure your system to send a syslog message to all of these. On each of these units, have a local script poll for this message and start a script or whatever you would like it to do.

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