PHP code example of php-opcua / opcua-session-manager

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

php-opcua / opcua-session-manager example snippets

use PhpOpcua\SessionManager\Client\ManagedClient;

$client = new ManagedClient();
$client->connect('opc.tcp://localhost:4840');

$value = $client->read('i=2259');
echo $value->getValue(); // 0 = Running

$client->disconnect();

// Request 1: open session — handshake happens once
$client = new ManagedClient();
$client->connect('opc.tcp://localhost:4840');
// Do NOT call disconnect() — session stays alive in daemon

// Request 2: same endpoint → reuses existing session automatically
$client = new ManagedClient();
$client->connect('opc.tcp://localhost:4840');
$client->wasSessionReused(); // true — no handshake needed
$value = $client->read('i=2259'); // ~5ms instead of ~155ms

// If you need a separate parallel session to the same server:
$client2 = new ManagedClient();
$client2->connectForceNew('opc.tcp://localhost:4840');
$client2->wasSessionReused(); // false — new session created

$refs = $client->browse('i=85');
foreach ($refs as $ref) {
    echo "{$ref->displayName} ({$ref->nodeId})\n";
}

$nodeId = $client->resolveNodeId('/Objects/Server/ServerStatus');
$status = $client->read($nodeId);

$results = $client->readMulti()
    ->node('i=2259')->value()
    ->node('ns=2;i=1001')->displayName()
    ->execute();

// Auto-detection (v4) — type inferred automatically
$client->write('ns=2;i=1001', 42);

// Explicit type (still supported)
use PhpOpcua\Client\Types\BuiltinType;
$client->write('ns=2;i=1001', 42, BuiltinType::Int32);

$sub = $client->createSubscription(publishingInterval: 500.0);

$client->createMonitoredItems($sub->subscriptionId, [
    ['nodeId' => 'ns=2;i=1001'],
]);

$response = $client->publish();
foreach ($response->notifications as $notif) {
    echo $notif['dataValue']->getValue() . "\n";
}

use PhpOpcua\Client\Event\DataChangeReceived;
use PhpOpcua\Client\Event\AlarmActivated;
use Psr\EventDispatcher\EventDispatcherInterface;

// 1. Start daemon with auto-publish
$daemon = new SessionManagerDaemon(
    socketPath: '/tmp/opcua.sock',
    clientEventDispatcher: $yourPsr14Dispatcher,
    autoPublish: true,
);

// 2. Pre-configure connections to auto-connect on startup
$daemon->autoConnect([
    'plc-1' => [
        'endpoint' => 'opc.tcp://192.168.1.10:4840',
        'config' => [],
        'subscriptions' => [
            [
                'publishing_interval' => 500.0,
                'max_keep_alive_count' => 5,
                'monitored_items' => [
                    ['node_id' => 'ns=2;s=Temperature', 'client_handle' => 1],
                    ['node_id' => 'ns=2;s=Pressure', 'client_handle' => 2],
                ],
                'event_monitored_items' => [
                    ['node_id' => 'i=2253', 'client_handle' => 10],
                ],
            ],
        ],
    ],
]);

$daemon->run();
// DataChangeReceived, EventNotificationReceived, AlarmActivated events
// are dispatched to your PSR-14 listeners automatically.

use PhpOpcua\Client\Security\SecurityPolicy;
use PhpOpcua\Client\Security\SecurityMode;

$client = new ManagedClient(
    socketPath: '/var/run/opcua-session-manager.sock',
    authToken: trim(file_get_contents('/etc/opcua/daemon.token')),
);

// RSA security
$client->setSecurityPolicy(SecurityPolicy::Basic256Sha256);
$client->setSecurityMode(SecurityMode::SignAndEncrypt);
$client->setClientCertificate('/certs/client.pem', '/certs/client.key');
$client->setUserCredentials('operator', 'secret');
$client->connect('opc.tcp://192.168.1.100:4840');

// ECC security (auto-generated ECC certificate)
$client = new ManagedClient();
$client->setSecurityPolicy(SecurityPolicy::EccNistP256);
$client->setSecurityMode(SecurityMode::SignAndEncrypt);
$client->setUserCredentials('operator', 'secret');
$client->connect('opc.tcp://192.168.1.100:4840');

bash
php bin/opcua-session-manager

bash
php bin/opcua-session-manager [options]