我正在尝试实施PHP SMPP http://www.phpclasses.org/package/1373-PHP-Sends-SMS-messages-via-an-SMPP-server.html并尝试获取送达回执，但我无法阅读。下面是我得到的PDU响应。
非常感谢您的帮助。
Trying to read PDU.
Reading PDU : 32 bytes.
Stream len : 28
Stream Hex : 80 00 00 05 00 00 00 0d 00 00 00 02 55 6e 6b 6e 6f 77 6e 20 63 6f 6d 6d 61 6e 64 2e
Command id : 5.
Command status : 13.
sequence_number : 2.
GOT deliver_sm.
Received PDU:
€(0)(0)(5)(0)(0)(0)(13)(0)(0)(0)(2)Unknown command.
Total number of count(sms) SMS= 1
Array
(
[service_type] =>
[source_addr_ton] => 0
[source_addr_npi] => 0
[source_addr] => Unknown command.
[dest_addr_ton] =>
[dest_addr_npi] =>
[destination_addr] =>
[esm_class] =>
[protocol_id] =>
[priority_flag] =>
[schedule_delivery_time] =>
[validity_period] =>
[registered_delivery] =>
[replace_if_present_flag] =>
[data_coding] =>
[sm_default_msg_id] =>
[sm_length] =>
[short_message] =>
)
GönderildiSending PDU, len == 16
Sending PDU, header-len == 16
Sending PDU, command_id == 6
Sending PDU, sequence number == 3
Sending PDU, command status == 0