Category "smpp"

I am getting error when try send sms using laravel-smpp

This is error:socket_close(): Argument #1 ($socket) must be of type Socket, null given, path:/vendor/php-smpp/php-smpp/sockettransport.class.php

Problem with concatenated messages in JSMPP

I have a problem sending concatenated messages to my SMSC, here, I will do my best to describe the problem. When sending concatenated messages, my SMSC waits to