How is the thermal printer hooked up to your code?

My thermal printer is connected to a PHP backend via USB, this is the script,
$connector = new WindowsPrintConnector("NictomImpresora");

I downloaded a repository, which includes more code, but from what I understand, those are the connections for Linux and Windows.

protected function finalizeLinux($data)
{
/* Non-Windows samba printing / $device = "//" . $this -> hostname . "/" . $this -> printerName; if ($this -> userName !== null) { $user = ($this -> workgroup != null ? ($this -> workgroup . "\") : "") . $this -> userName; if ($this -> userPassword == null) { // No password $command = sprintf( "smbclient %s -U %s -c %s -N -m SMB2", escapeshellarg($device), escapeshellarg($user), escapeshellarg("print -") ); $redactedCommand = $command; } else { // With password $command = sprintf( "smbclient %s %s -U %s -c %s -m SMB2", escapeshellarg($device), escapeshellarg($this -> userPassword), escapeshellarg($user), escapeshellarg("print -") ); $redactedCommand = sprintf( "smbclient %s %s -U %s -c %s -m SMB2", escapeshellarg($device), escapeshellarg(""),
escapeshellarg($user),
escapeshellarg("print -")
);
}
} else {
// No authentication information at all
$command = sprintf(
"smbclient %s -c %s -N -m SMB2",
escapeshellarg($device),
escapeshellarg("print -")
);
$redactedCommand = $command;
}
$retval = $this -> runCommand($command, $outputStr, $errorStr, $data);
if ($retval != 0) {
throw new Exception("Failed to print. Command \"$redactedCommand\" " .
"failed with exit code $retval: " . trim($errorStr) . trim($outputStr));
}
}

protected function finalizeWin($data)
{
/* Windows-friendly printing of all sorts / if (!$this -> isLocal) { / Networked printing / $device = "\\" . $this -> hostname . "\" . $this -> printerName; if ($this -> userName !== null) { / Log in / $user = "/user:" . ($this -> workgroup != null ? ($this -> workgroup . "\") : "") . $this -> userName; if ($this -> userPassword == null) { $command = sprintf( "net use %s %s", escapeshellarg($device), escapeshellarg($user) ); $redactedCommand = $command; } else { $command = sprintf( "net use %s %s %s", escapeshellarg($device), escapeshellarg($user), escapeshellarg($this -> userPassword) ); $redactedCommand = sprintf( "net use %s %s %s", escapeshellarg($device), escapeshellarg($user), escapeshellarg("")
);
}
$retval = $this -> runCommand($command, $outputStr, $errorStr);
if ($retval != 0) {
throw new Exception("Failed to print. Command \"$redactedCommand\" " .
"failed with exit code $retval: " . trim($errorStr));
}
}
/* Final print-out / $filename = tempnam(sysgettempdir(), "escpos"); if ($filename === false) { throw new Exception("Failed to create temp file for printing."); } fileput_contents($filename, $data);
if (!$this -> runCopy($filename, $device)) {
throw new Exception("Failed to copy file to printer");
}
unlink($filename);
} else {
/ Drop data straight on the printer */
if (!$this -> runWrite($data, $this -> printerName)) {
throw new Exception("Failed to write file to printer at " . $this -> printerName);
}
}
}

I would think it goes without saying but you aren't going to be able to connect anything via USB to a Railway hosted service.

Didn't know that, to be honest. I'm not very involved in thermal printing, I'm doing it because a friend asked me to. Is it possible via WiFi? Thanks for your help.