No library example of using JSON-RPC to get access to connected user names of a Jamulus server

loadserverstat.php

<?php

function loadserverstat($rpcsecret, $jsonrpcport) {
    
    // connect to the Jamulus JSON-RPC endpoint
    $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
    if (!socket_connect($socket, "localhost", $jsonrpcport)) {
        echo "Could not connect to Jamulus JSON-RPC endpoint. Please check for connectivity errors.";
        exit(1);
    }
    
    // authenticate
    $auth = json_encode(["id" => 1, "jsonrpc"=>"2.0", "method"=>"jamulus/apiAuth", "params"=> ["secret" => $rpcsecret]]) . PHP_EOL;
    if (!socket_write($socket, $auth, strlen($auth)) == strlen($auth)) {
        echo "Could not start authentication with Jamulus JSON-RPC endpoint";
        exit(1);
    }

    $authResponse = socket_read($socket, 4096, PHP_NORMAL_READ);
    if (!$authResponse) {
        echo "Could not read authentication from Jamulus JSON-RPC endpoint.";
        exit(1);
    }

    $resp = json_decode($authResponse);
    if (isset($resp->result) && $resp->result == "ok") {
        // authenticated
        // check if Jamulus is in server mode.
        $modeRequest = json_encode(["id" => 2, "jsonrpc"=>"2.0", "method"=>"jamulus/getMode", "params"=> ["m" => "g"]]) . PHP_EOL;
        if (!socket_write($socket, $modeRequest, strlen($modeRequest)) == strlen($modeRequest)) {
            echo "Could not request server or client mode";
            exit(1);
        }

        while ($res = socket_read($socket, 4096, PHP_NORMAL_READ)) {
            $encodedRes = json_decode($res);
            if (!$encodedRes) {
                // failed to decode
                error_log("Could not decode string from server");
                continue;
            }
            if ($encodedRes->id === 2 && $encodedRes->result->mode === "server") {
                break;
            } else {
                echo "Jamulus is not running as a server" . PHP_EOL;
                exit(1);
            }
        }

        // get the client list

        $clientListRequest = json_encode(["id" => 3, "jsonrpc"=>"2.0", "method"=>"jamulusserver/getClients", "params"=> ["m" => "g"]]) . PHP_EOL;
        if (!socket_write($socket, $clientListRequest, strlen($clientListRequest)) == strlen($clientListRequest)) {
            echo "Could not request client list";
            exit(1);
        }

        
        // get clients and output as unordered list
        while ($res = socket_read($socket, 8192, PHP_NORMAL_READ)) {
            // TODO: depending on the response length: bump up the number of bytes to read!
            $encodedRes = json_decode($res);
            if (!$encodedRes) {
                // failed to decode
                error_log("Could not decode string from server");
                continue;
            }

            if ($encodedRes->id === 3) {
                print "<ul>";
                foreach ($encodedRes->result->clients as $client) {
                    print "<li>" . htmlspecialchars($client->name) . "</li>";
                }
                print "</ul>" . PHP_EOL;
                break;
            }
        }
    } else {
        echo "Could not authenticate. Please check your password";
        exit(1);
    }
    
}

// TODO: Set port and secrets here.
echo loadserverstat("<yourjsonrpcsecrethere>", <yourjsonrpcporthere>);