PHP function wp_sms_send does not work

Please try to get the result of the function

$result = wp_sms_send(...
print_r($result);

This is the result:

WP_Error Object ( [errors] => Array ( [send-sms] => Array ( [0] => Array ( [headers] => Requests_Utility_CaseInsensitiveDictionary Object ( [data:protected] => Array ( [cache-control] => no-store, no-cache, must-revalidate,no-cache [pragma] => no-cache [content-type] => application/json;charset=utf-8 [server] => Array ( [0] => Microsoft-IIS/8.5 [1] => Kavenegar ) [access-control-allow-origin] => * [access-control-allow-headers] => Content-Type [access-control-allow-method] => POST, GET, OPTIONS [date] => Mon, 04 Nov 2019 16:30:49 GMT ) ) [body] => {"return":{"status":411,"message":"?????? ????? ??????? ???"},"entries":null} [response] => Array ( [code] => 411 [message] => Length Required ) [cookies] => Array ( ) [filename] => [http_response] => WP_HTTP_Requests_Response Object ( [response:protected] => Requests_Response Object ( [body] => {"return":{"status":411,"message":"?????? ????? ??????? ???"},"entries":null} [raw] => HTTP/1.1 411 Length Required Cache-Control: no-store, no-cache, must-revalidate,no-cache Pragma: no-cache Transfer-Encoding: chunked Content-Type: application/json;charset=utf-8 Server: Microsoft-IIS/8.5 Access-Control-Allow-Origin: * Access-Control-Allow-Headers: Content-Type Access-Control-Allow-Method: POST, GET, OPTIONS Server: Kavenegar Date: Mon, 04 Nov 2019 16:30:49 GMT Connection: close {"return":{"status":411,"message":"?????? ????? ??????? ???"},"entries":null} [headers] => Requests_Response_Headers Object ( [data:protected] => Array ( [cache-control] => Array ( [0] => no-store, no-cache, must-revalidate,no-cache ) [pragma] => Array ( [0] => no-cache ) [content-type] => Array ( [0] => application/json;charset=utf-8 ) [server] => Array ( [0] => Microsoft-IIS/8.5 [1] => Kavenegar ) [access-control-allow-origin] => Array ( [0] => * ) [access-control-allow-headers] => Array ( [0] => Content-Type ) [access-control-allow-method] => Array ( [0] => POST, GET, OPTIONS ) [date] => Array ( [0] => Mon, 04 Nov 2019 16:30:49 GMT ) ) ) [status_code] => 411 [protocol_version] => 1.1 [success] => [redirects] => 0 [url] => https://api.kavenegar.com/v1/xxx/sms/send.json/ [history] => Array ( ) [cookies] => Requests_Cookie_Jar Object ( [cookies:protected] => Array ( ) ) ) [filename:protected] => [data] => [headers] => [status] => ) ) ) ) [error_data] => Array ( ) )

Pay more attention to the error, It’s clear.

I’ve checked everything with both Kavenegar and TSMS gateways, but none of them works with this function. It’s the same for both.