Error "Failed to read reply to command: 0x4"

[sm-unipesa]

Hi,

Thank you for your fantastic work with this library! I started using PHP8 with php8-smpp and received the error "Failed to read a reply to command: 0x4" to send SMS regardless of the value $smsNullTerminateOctetstrings.

Do you have any idea how to fix that?

Many thanks in advance.

[alexandr-mironov]

Hi, can you describe when you get this error, more details or code example, please?

[sm-unipesa]

I use the code from your documentation. Receiving this error when sending SMS: $response = $this->smppClient->sendSMS($this->from, $this->to, $message, null, Smpp::DATA_CODING_UCS2);

[alexandr-mironov]

try to reproduce your problem, but cannot get same error, which mode you use? in my example used tranciever mode, but your SMPP gate may not support this mode

[sm-unipesa]

I tried both - bindTransmitter() and bindTransceiver(). Result is the same - "Failed to read reply to command: 0x4"

[alexandr-mironov]

Can you provide debug output and SMPP gate which you use to i try to reproduce your error?

[sm-unipesa]

Sorry for the late reply. Can you help me to inject the logger into your library? I use Laravel with Monolog in my app.

[alexandr-mironov]

Hello! looks like you should add it to socket constructor for example:

<?php

declare(strict_types=1);

namespace app\components\Sms;

use Exception;
use smpp\{Address, Client as SmppClient, Smpp, transport\Socket};

class SmsBuilder
{
    /** @var string 11 chars limit */
    public const DEFAULT_SENDER = 'example';

    protected Socket $transport;

    protected SmppClient $smppClient;

    protected bool $debug = false;

    protected Address $from;

    protected Address $to;

    protected string $login;

    protected string $password;

    /**
     * SmsBuilder constructor.
     *
     * @param string $address SMSC IP
     * @param int $port SMSC port
     * @param string $login
     * @param string $password
     * @param int $timeout timeout of reading PDU in milliseconds
     * @param bool $debug - debug flag when true output additional info
     */
    public function __construct(
        string $address,
        int $port,
        string $login,
        string $password,
        int $timeout = 10000,
        bool $debug = false, 
        LoggerInterface $logger
    ) {
       // place to add your logger to Socket constructor
        $this->transport = new Socket([$address], $port, false, $logger);
        // Activate binary hex-output of server interaction
        $this->transport->debug = $debug;
        $this->transport->setRecvTimeout($timeout);
        $this->smppClient = new SmppClient($this->transport);

        $this->login = $login;
        $this->password = $password;

        $this->from = new Address(self::DEFAULT_SENDER, SMPP::TON_ALPHANUMERIC);
    }

    /**
     * @param string $sender
     * @param int $ton
     *
     * @return $this
     * @throws Exception
     */
    public function setSender(string $sender, int $ton): SmsBuilder
    {
        return $this->setAddress($sender, 'from', $ton);
    }

    /**
     * @param string $address
     * @param string $type
     * @param int $ton
     * @param int $npi
     *
     * @return $this
     * @throws Exception
     */
    protected function setAddress(
        string $address,
        string $type,
        int $ton = SMPP::TON_UNKNOWN,
        int $npi = SMPP::NPI_UNKNOWN
    ): SmsBuilder {
        // some example of data preparation
        if ($ton === SMPP::TON_INTERNATIONAL) {
            $npi = SMPP::NPI_E164;
        }
        $this->$type = new Address($address, $ton, $npi);

        return $this;
    }

    /**
     * @param string $address
     * @param int $ton
     *
     * @return $this
     * @throws Exception
     */
    public function setRecipient(string $address, int $ton): SmsBuilder
    {
        return $this->setAddress($address, 'to', $ton);
    }

    /**
     * @param string $message
     *
     * @throws Exception
     */
    public function sendMessage(string $message): void
    {
        $this->transport->open();
        $this->smppClient->bindTransceiver($this->login, $this->password);
        // strongly recommend use SMPP::DATA_CODING_UCS2 as default encoding in project to prevent problems with non latin symbols
        $this->smppClient->sendSMS($this->from, $this->to, $message, null, SMPP::DATA_CODING_UCS2);
        $this->smppClient->close();
    }
}

don't forget to set $debug to true)

[alexandr-mironov]

<?php
// some your client code
// true after 10000 its a debug, $logger is your Monolog instance
(new your_namespace\SmsBuilder('192.168.1.1', '2776', 'your_login', 'your_password', 10000, true, $logger))
    ->setRecipient('79000000000', \smpp\SMPP::TON_INTERNATIONAL) //msisdn of recipient
    ->sendMessage('Тестовое сообщение на русском and @noth3r$Ymb0ls');