public function appcmd($cmd, $args)
	{
		...(проверка аргументов и предварительная обработка)...
		$str = ...(итоговая строка, отправляемая на telnet-сервер)...
		if (strtoupper($cmd) == 'AUTH') {
			$ws = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
			$rc = socket_connect($ws, $srv, $port));
			...
			$this->store['appsrv'] = $ws;
			$ret = $this->telnet_send_wait($str);
		} else {
			if (!isset($this->store['appsrv']))
			{
				$rc = $this->appcmd('AUTH', ['bmuser'=>$usr, 'bmpassword'=>$pwd]);
				if (!$rc) return $rc;
			}
			$ret = $this->telnet_send_wait($str);
		}
		return $ret;
	}

	private function telnet_send_wait($command, $timeout=null)
	{
		if (!isset($this->store['appsrv'])) return;
		$ws = $this->store['appsrv'];
		$command .= "\n";
		$rc = socket_write($ws, $command);
		if ($rc === false)
		{
			if ($this->log) $this->log->error("Socket send error #".socket_last_error($ws), socket_strerror(socket_last_error($ws)), __CLASS__);
			return;
		}
		do {
			$r = [$ws]; $w = null; $e = null;
			$rc = socket_select($r, $w, $e, 0);
			if ($rc === false)
			{
				if ($this->log) $this->log->error("Socket check error #".socket_last_error($ws), socket_strerror(socket_last_error($ws)), __CLASS__);
				return;
			}
			if (!$rc) break;
			$rc = socket_select($r, $w, $e, 1);
			if ($rc === false)
			{
				if ($this->log) $this->log->error("Socket wait error #".socket_last_error($ws), socket_strerror(socket_last_error($ws)), __CLASS__);
				return;
			}
			if (!$rc) break;
			$res = '';
			foreach ($r as $s)
			{
				$data = socket_read($s, 1024, PHP_NORMAL_READ);
				$res .= $data;

			}
		} while (1);
	}

	private function telnet_send_wait($command, $timeout=null)
	{
		if (!isset($this->store['appsrv'])) return;
		if (!isset($timeout)) $timeout = 1;
		$ws = $this->store['appsrv'];
		$command .= "\n";
		$rc = socket_write($ws, $command);
		if ($rc === false) return;
print "> $command";
		$rc = socket_read($ws, 2048);
		if ($rc === false) return;
print "< $rc";
print "\n";
		return $rc;
	}