one sms support about 152 characters. I notice that you send 172 characters in your message. So it will be divided into 2 sms. And it takes more time. But you set the timeout to 5 seconds. it may not be enough for the gateway to respose. Please try to set the timeout value to 10. If you still have problem, please contact me dirrectly via skype.
best regards,
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skype: linda.li258