puff/client is Puff's protocol-neutral, Fiber-aware outbound transport. It provides non-blocking TCP/TLS connections for higher-level clients such as puff/http-client and a future puff/mqtt-client.

composer require puff/client

use Puff\Client\Connector;
use Puff\Client\Endpoint;

$connection = (new Connector())->connect(new Endpoint('example.com', 443, tls: true))->await();
$connection->handlers(
    onData: static fn (string $data) => print $data,
    onClose: static fn () => null,
    onError: static fn (Throwable $error) => throw $error,
);
$connection->write("GET / HTTP/1.1\r\nHost: example.com\r\nConnection: close\r\n\r\n");

The package deliberately does not implement HTTP, MQTT, retries, redirects, or protocol framing. Those responsibilities belong to protocol packages.