Persistent socket/connection PHP for SMPP/SMS -

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i need set persistent socket connection in php , not sure how achieve this. when send sms message a) open socket connection b) send message (via sms/smpp) , c) close socket connection

however need not open , close connection time. rather, require 

- 2 persistent connections maintains connectivity smsc (sms centre) , reconnects when timeout occurs.  - 1 persistent connection reading sms , 1 sending sms. - automatic restart/recovery (i.e. when memory issues arise) - automatic looping act listener incoming events such receiving incoming delivery receipts , sms messages, 'ping' (enquire link) keep smpp connection alive.

update: wondering if had achieved above using following: https://github.com/shaneharter/php-daemon

function pfsockopen seems have capabilities looking for. check out question - php pfsockopen in session.

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a personal observation on implementation. assuming php code triggered incoming request , other times, smpp client inactive. may not quite suitable smpp few reasons:

  • smpp clients required send response pdu(s) inbound pdu receive smsc.
  • one of these pdu(s) enquire_link used keep connection alive. if smpp client fails return enquire_link_resp pdu, connection dropped. may experience more of these. using pfsockopen not solve problem.
  • if want offer delivery confirmation, smpp client must respond smsc.
  • if smpp client fails send response pdu pdu recieves smsc (if reads bytes pipe), smsc may resend of pdu(s). opens possible risks of creating unnecessary hit on smpp client machine.

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