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PHP Retrieve data from DEVICE by websocket

J

jjdk

Coder
Hi.
I'm hoping for some help to requesting some data from a DEVICE. Normally I can do it with CURL(), but I can only access to the device by using websocket:

Authentication is done by JSON data - an it's the same with requesting data.

I've got some information:

websocket: wss://658608ab.in.larnitech.com:8443/api
Authorization: {"request": "authorize", "key": "999999999999"}

And then I have examples of different requests, e.g.

Get list of devices: {"request":"getDevices"}

I've looked around the web and came up with the code below, but I still don't have my request included. And I think there are repetitions in the header, but probably also something that doesn't fit.
I’m stuck.

PHP: 
$key =     '99999999999';
$host = 'wss://658608ab.in.larnitech.com:8443/api';
$port = -1; //Use -1 when you don't use PORT
$local = 'https://mydomaene.dk';

$login = [
    'request'     => 'authorize',
    'key'         => $key
];

$login=json_encode($login);

$data = [
    'request'     => 'getDevices'
];

$data=json_encode($data);

$head = "GET / HTTP/1.1"."\r\n".
        "Upgrade: WebSocket"."\r\n".
        "Connection: Upgrade"."\r\n".
        "Origin: $local"."\r\n".
        "Host: $host"."\r\n".
        "Sec-WebSocket-Version: 13"."\r\n".
        "Sec-WebSocket-Key: $key"."\r\n".
        "Content-Length: ".strlen($login)."\r\n"."\r\n";

$sock = fsockopen($host, $port, $errno, $errstr, 30);
 
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Hey! Happy to try and help with your WebSocket setup, but we’ll need a bit more info to figure out what’s going wrong.

Are you seeing any specific errors right now? Is it failing to connect entirely, or are you just not getting a response?

Also, have you looked into using something like Ratchet or Pawl? They can handle a lot of the annoying low-level WebSocket stuff for you, so you can focus more on just sending/receiving data.

Any chance the device manufacturer has some docs or specs for their WebSocket API? A lot of these devices expect messages in a certain format or require the connection to stay alive in a specific way.

And what's your end goal here — are you trying to pull data once, or do you want a constant connection for real-time updates?

If you’ve managed to connect to the device using another language or tool, that would also be really useful to see.

Basically, the more context you can give — what you’ve tried, what your setup looks like, what’s actually happening — the easier it’ll be to point you in the right direction.
 
Upvote 0 Downvote
simong1993 said:
Hey! Happy to try and help with your WebSocket setup, but we’ll need a bit more info to figure out what’s going wrong.

Are you seeing any specific errors right now? Is it failing to connect entirely, or are you just not getting a response?

Also, have you looked into using something like Ratchet or Pawl? They can handle a lot of the annoying low-level WebSocket stuff for you, so you can focus more on just sending/receiving data.

Any chance the device manufacturer has some docs or specs for their WebSocket API? A lot of these devices expect messages in a certain format or require the connection to stay alive in a specific way.

And what's your end goal here — are you trying to pull data once, or do you want a constant connection for real-time updates?

If you’ve managed to connect to the device using another language or tool, that would also be really useful to see.

Basically, the more context you can give — what you’ve tried, what your setup looks like, what’s actually happening — the easier it’ll be to point you in the right direction.
Click to expand...

Hello and thank you very much for your commitment to my challenges.

I am very sorry for the late reply - I have had some personal problems, but everything is OK now.

1. I would prefer to use my own program code.

2. I get this error: Warning: fsockopen(): Unable to connect to wss://658608ab.in.larnitech.com:8443/api:-1 (Unable to find the socket transport "wss" - did you forget to enable it when you configured PHP?)

The manufacturer has provided this server address:
wss://658608ab.in.larnitech.com:8443/api
After the port number, the folder /api is specified.

I don't know how to include the port and the folder name in my program code.

PHP: fsockopen - Manual shows that the port number can be specified with -1, which should ignore the port number. Then I use the hole wss:/........:8443/api as Host. But it doesn't work.

3. The manufacturer has this public API: API2 - Larnitech wiki page

4. I want to retrieve data a few times a day. This is controlled with a CronJob.

5. This code works fine using curl():
PHP: 
$key =     '999999999999';
$url =     'https://proxy.larnitech.com/658608ab/1234567890112/API2/';
$data = [
        'request'     => 'getDevices',
        'API-KEY'     => $key
];
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true );
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_HTTPHEADER, ["Content-Type: application/json"] );
curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
$response = curl_exec($curl);
curl_close($curl);
print_r($response);
 
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