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| ==== How can you specify a port for sending SMS? ====
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| When you need to specify a port for sending SMS, you can set port parameter in the SMS sending request. If you don’t need to send SMS through a specific port, port parameter is not necessary.
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| ==== How to match an SMS sending result with an SMS sending request? ====
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| It is advised to use user_id in the SMS sending request. You can use different user id when SMS is sent to a different telephone number, and then SMS sending result will also carry this user id. Each user id needs to be unique, and generally it is changed in an increasing order.
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| ==== How fast can a SMS be sent? ====
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| It takes about 5 to 8 seconds to send a SMS message on a GSM gateway, and about 2 to 4 seconds on a LTE gateway. The time depends on the GSM network quality. When the GSM network is in a bad condition, it may take about 1 minute.
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| ==== How can you get SMS delivery status? ====
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| Generally, it is not necessary to query delivery status, as delivery status is included in SMS sending Result. But if you want to control the SMS delivery, please see the following:
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| SMS delivery status is received by gateway in unspecific time. It is connected with an SMS sending result by a ref_id. And it is better to query delivery status after SENT_OK is returned. For a long SMS message which will be divided into 3 smaller SMS segments, if the first ref_id in SMS sending result is 0 and those of other two SMS segments are 1 and 2 respectively, at least 3 delivery statuses will be received, carrying ref_id 0, 1 and 2 respectively.
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| '''How can you disable SMS delivery status?'''
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| Set the value of ‘request_status_report’parameter into ‘false’ in the SMS sending request.
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| ==== How to send HTTP(s) request in the program? ====
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| C/C++ and PHP can use libcurl for sending HTTP(s) request. The parameter in libcurl is almost the same in curl utility.
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| {| class="wikitable"
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| |curl
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| |libcurl
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| |-
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| |<nowiki>-k</nowiki>
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| |CURLOPT_SSL_VERIFYPEER,
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| CURLOPT_SSL_VERIFYHOST,
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| |-
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| |<nowiki>-u</nowiki>
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| |CURLOPT_USERPWD
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| |-
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| |<nowiki>--anyauth</nowiki>
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| |CURLOPT_HTTPAUTH
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| |-
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| |<nowiki>-H</nowiki>
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| |CURLOPT_HTTPHEADER
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| |-
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| |<nowiki>-d</nowiki>
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| |CURLOPT_POSTFIELDSCURLOPT_POSTFIELDS
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| |}
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| PHP example:
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| ''$curl = curl_init($url);''
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| ''curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY ) ; curl_setopt($curl, CURLOPT_HEADER, true); curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);''
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| ''curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-type: application/json;"));''
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| ''curl_setopt($curl, CURLOPT_USERPWD, "admin:admin"); curl_setopt($curl, CURLOPT_POST, true); curl_setopt($curl, CURLOPT_POSTFIELDS, $content); curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);''
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| ''curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);''
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| ''curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);''
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| C#, JAVA, PYTHON and other programming language have their own lib for sending http request, please check the programming manual for help.
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