How to send PDU SMS

PDU is the communication core of most terminals, and only a few terminals only support short messages. PDU mode can provide more powerful functions than text mode, but its coding is more difficult than text mode. No matter which mode, we can control the terminal to realize the sending, receiving, querying and other operations of short messages through AT command. The following first introduces the composition and coding and decoding of PDU.

Composition of PDU:

PDU is a string consisting of "0-9", "a-f" and "a-f". On the surface, it seems to be composed of a set of hexadecimal numbers of 16, and every two characters constitute an octet. (For example:' 23'=0x23,' 2a'=0x2a, both in hexadecimal 16)

Click on the link for details: /link? URL = afos 9 ldjrublv 5 xuvik 0t-fwkvscfe 8 kmi 6 mmlwtgrxeb 6 qf 4 pzwhazfrw-S _ 35en 3 aknneousjqpxnrmuzgof 3-b 7o whh _ gya 1 mkh KIO .