/**
* @param string $payload
*
* @return string
* @throws ConnectionException
*/
public function send($payload)
{
if (!$this->ws->isConnected()) {
throw new ConnectionException(sprintf('Could not connect to "%s"', $this->address));
}
$this->ws->send($payload);
$response = $this->ws->receive();
if (($opCode = $this->ws->getLastOpcode()) !== 'text') {
throw new ConnectionException(sprintf('Received non-text frame of type "%s" with text: "%s"', $opCode, $response));
}
return $response;
}
