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POWebserver from linux(debian) sends data to an Ip in a network
 

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  1. POWebserver from linux(debian) sends data to an Ip in a network
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    <p><img src="https://i.stack.imgur.com/TuYlL.gif" alt="enter image description here"></p> <p>Hi,</p> <p>From the image above, I have a webserver a linux machine and client/device.. Now i need for this 3 to communicate. The webserver sends data to an ip address(client/device) based on button pressed on the webpage. but before the data is sent, the data must first access the linux machine, the machine then sends the data down to the device which then the device reads the data and act based on the command sent.. then the device sends back data to the linux machine which then the linux machine sends it to the webserver for ack'd. meaning data is received by the device without any problems.</p> <ol> <li><p>Php is for the webserver. Now how will php sends data to an ip adress.</p></li> <li><p>The linux machine handles all requests and sends everything down to the device and when the device got the data it will send a data to linux machine which then machine sends an ok to the webserver that the data arrived succesfully.(I read about socket programming and i think of creating an application that reads requests.) or if you have any idea how can i do this?.</p></li> <li><p>How can the device read a data sent by the webserver?..</p></li> </ol> <p>Thanks,</p> <p><strong>EDIT:</strong> The device is not connected to the linux machine. the device is only connnected via the ethernet cable.</p>
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    1. COCould you provide a bit more details about the device? Does it support any standard protocols (maybe Telnet? HTTP?), and whether it provides streams of data (like audio/video), or just short responses to queries?
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    2. COSorry about that...well the device is arduino+ethernet shield on it.. a stepper driver is connected to it for which the stepper motors are connnected.. the stepper moves depending on the data sent by the controller/linux machine to the arduino+ethernet shield. I plan to use the client on this site http://www.linuxhowtos.org/C_C++/socket.htm which i can use to send data to the ip of arduino ethernet. The arduino ethernet then reads it by doing client.read().. for the browser to read data on linux i plan on using pipes on php. Thank you for helping me.
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    3. COIf you use TCP sockets, then sending back data from the Arduino ethernet shield is as simple as `client.write()`. The TCP connection is bidirectional, all you need to be aware of is to avoid the situation when both wait for the other to send data. You can contact the Arduino directly from PHP, too, if you use PHP `fsockopen()` to open the connection to the Arduino separately each time the user presses a button.
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