RSCP communication with PHP

[Brovning]

Hello,

 

is it possible to implement a RSCP (Remote-Storage-Control-Protocol) communication for a PV-battery with PHP?

I'm experienced with PHP, but I have never implemented a socket communication with PHP...

 

How do I create a frame fulfilling the length constraints (see attached image)?

 

For example, what do I have to do to send the following frame:

Frame:    0xE3    0xDC    0x01    0x00    0x11    0x59    0x7B    0x53    0x00    0x00    0x00    0x00    0x00    0x00    0x00    0x00    0x0E    0x00    0x20    0x00    0x00    0x06    0x00    0x00    0x00    0x12    0x00    0x00    0x01    0x00    0x00    0x00

+ CRC32 Checksum

 

Best regards,

 

Brovning

Edited May 24, 2020 by Brovning

[gizmola]

Yes.  Take a look at stream_socket_client and pack.

I don't think this type of application is PHP's forte, but it is possible.  Creating an executable with c, c++ or Go would be a simpler final product upon completion, but PHP is certainly capable.  

[Brovning]

Hello,

thank you!

I found a Cpp implementation for this protocol, but I'd like to have it in PHP, because my home automation is based on PHP.

What is the easiest way to "convert" a Cpp implementation to PHP?

[gizmola]

Did you look at the links I provided?  There's not much more to it.  Pack will let you pack the bytes into a binary string.  You make the socket connection and fwrite the packed string to it.

[Brovning]

Hello,

yes, I tried it, but the server is not responding:

$fp = stream_socket_client("tcp://".$serverIp.":".$serverPort, $errno, $errstr, 30);

$msg = pack("n*", 0xE3DC, 0x0100, 0x1159, 0x7B53, 0x0000, 0x0000, 0x0000, 0x0000, 0x0E00, 0x2000, 0x0006, 0x0000, 0x0012, 0x0000, 0x0100, 0x0000);
$msg .= pack("N", crc32($msg));

if (!$fp) {
    echo "$errstr ($errno)<br />\n";
} else {
    fwrite($fp, $msg);
    while (!feof($fp)) {
        echo fgets($fp, 1024);
    }
    fclose($fp);
}

I'm receiving a timeout after 30 seconds.

[gizmola]

I'm not familiar with this protocol.  Are there other details (authentication or encryption for example) that might explain your result?  

[requinix]

What's the C++ code you're working from?

[NotionCommotion]

Maybe I am wrong but sure looks like serial communication (most likely RS-485) and not Ethernet.