The short message in PDU format sent by GSM module cannot be received by the target mobile phone. What happened?

I think there is something wrong with your AT+CMGS= length.

Look at the following data and try it according to your own situation. . .

Input data 0011000d91685138628455f20008010c77ed4fe15df265365230ff0/kloc-0.

Where length 27 does not include the first byte 00 of PDU data.

The following is an analysis of the whole data:

00: the length of the SMS service center number, 00 means that the module will use the service center number already stored in the SIM card, because there is no need to reset it here.

1 1: the first byte of the file, which can be 1 1 by default.

00: information type; The default can be 00.

0D: length of called number (actual number is 86 15832648552)

9 1: the type of the called number, usually 9 1, indicating that TON/NPI conforms to the international /E. 164 standard.

685 138628455F2: After displacement processing, the actual number is "86 15832648552". Displacement processing refers to the inversion of adjacent two digits, such as changing 68 to 86, 15 to 5 1, and 83 to 38. The letter f indicates that the length of the string should be reduced by 1.

00: agreement mark, generally 00.

08: indicates that Unicode encoding is used. This system uses this coding scheme because it sends Chinese.

0 1: indicates the validity period of the short message, which is 5 minutes here.

0C: The encoding length of the short message content is 12.

77ed4fe15df265365230ff01:stands for sending the message "SMS received!"