Sending string/data via php to device connected to my server

Question

Good Day,

I have a hardware device (an RN-XV WiFi chip) which has successfully connected to my server IP address through port 80. I am able to send junk data and it responds with a "server is unable to serve this request", meaning there is a connection.

Now, I need to talk to this device/send it data/strings. I know some basic PHP, but I have no idea how to approach this problem. My device is connected to the server but:

To send data to it, I have to know the IP/Port of the device connected right? How do I find that out?
If I am able to obtain this..is sending data a matter of opening a TCP connection via PHP and sending a string?
Now that I am connected to the server, I am somehow able to send strings, but it returns with a server unable to serve this request. How do I actually send data to a particular PHP file to read?

Please Help! Thanks in advance!

What is intended use? It will help us visualize your problem. — Emery King
– Emery King, Commented Feb 12, 2013 at 3:34
just testing communication between a server and a device thats all. for my embedded systems project. — raaj
– raaj, Commented Feb 12, 2013 at 3:44
yeah, but are you trying to send a command to the wireless device or use the wireless device to command something else? What is its function? — Emery King
– Emery King, Commented Feb 12, 2013 at 3:49

mohammad mohsenipur · Accepted Answer · 2013-02-12 04:53:43Z

1

you must write program for socket .see this page for php socket programming http://php.net/manual/en/book.sockets.php

with this function you can connect to every port , send data and get response with every format that you want .

sample:for connect to Device

<?php
    $fp = fsockopen("udp://127.0.0.1", 2000, $errno, $errstr);
    if (!$fp) {
        echo "ERROR: $errno - $errstr<br />\n";
    } else {
       fwrite($fp, "data for send");
       while ( !feof( $fp ) ) { 
          $ret .= fgets( $fp, 4096 ); 
       }
       echo $ret;
       fclose($fp);
    }
?>

more sample http://php.net/manual/en/function.fsockopen.php

edited Feb 12, 2013 at 4:53

answered Feb 12, 2013 at 3:54

mohammad mohsenipur

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14 Comments

raaj Over a year ago

Okay please answer this. My device is connected to my server, and if I want to use socket programming TCP or UDP..i need the IP address of my device! How on earth do I find this out? I only have the IP address of the device connected to my wireless network. what is the address of my device on the server?!

mohammad mohsenipur Over a year ago

@user1436508 when php and device is on one server for connect to device use 127.0.0.1 ip is for inside of server

mohammad mohsenipur Over a year ago

localhost is point to your php server that you run php on it .you can use it for connect to anther device and service on php server .

raaj Over a year ago

ARGH! please my question is very simple. my device is now listening to any/all responses sent via UDP from my server from say port 2000. it is configured like that. the problem is..what address do i send the UDP data to in the php script!? I cant send it to localhost right? I need to send it to my device! What do i do?

mohammad mohsenipur Over a year ago

@user1436508 I Put One Sample for it see.

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