madrawproxy.php

<?php

require 'vendor/autoload.php';

use GuzzleHttp\Client;

$f3 = Base::instance();
$f3->receivers = [
  [
    "url" => "http://rdmserver123:9001/raw",
    "secret" => "pa55word"
  ],
  [
    "url" => "http://rdmserver456:9001/raw",
    "secret" => "f00b4r!"
  ]
];

function forward_data($content) {
  $f3 = Base::instance();

  $contents = [];
  foreach ($content as $cnt) {
    if (!in_array($cnt->type, [2, 106, 102, 104, 101, 156])) {
      continue;
    }
    
    array_push($contents, [
      "data" => $cnt->payload,
      "method" => $cnt->type,
      "length" => strlen($cnt->payload)
    ]);
  }

  $data = [
    "devicename" => "MADproxy",
    "idfa" => "00000000-0000-0000-0000-00000000",
    "trainerlvl" => 30,
    "contents" => $contents,
    "username" => $_SERVER['HTTP_ORIGIN']
  ];

  foreach ($f3->receivers as $receiver) {
    $options = [
      'headers' => [
        'User-Agent' => 'RDM proxy/1.0',
        'Authorization' => 'Bearer '. $receiver["secret"]
      ]
    ];

    $client = new Client($options);
    $res = $client->post($receiver["url"], ['json' => $data, 'timeout' => 3]);
  }
}

$f3->route('POST /', function() use($f3) {
  $content = json_decode(file_get_contents('php://input'));
  forward_data($content);
});

$f3->run();

Requires composer. Install dependencies via

composer require bcosca/fatfree-core guzzlehttp/guzzle

Save as index.php in your preferred location and point PD to http://server.com/location/. Do not point it directly to index.php nor use any other file names.