What is the meaning of "data_coding" field in the SMPP protocol?
I searched for this but couldn't find any helpful resource.
In short, datacoding contains the information on how the text in an smpp SubmitSM (i.e. a typical SMS message) message is encoded. The SubmitSM packet contains a binary encoded body, and the dataCoding is how the text is stored in this body.
The most important values are:
- 00000000 (0) - usually GSM7 (the default 7 bit encoding for messages, with a few characters that are encoded as two bytes), but technically could be something else
- 00000011 (3) for standard ISO-8859-1
- 00001000 (8) for the universal character set -- de facto UTF-16
Other possible values (rarely used):
- 00000001 - IA5_CCITT_T_50_ASCII_ANSI_X3_4
- 00000010 - OCTET_UNSPECIFIED_8BIT_BINARY_1
- 00000100 - OCTET_UNSPECIFIED_8BIT_BINARY_2
- 00000101 - JIS_X_02081990
- 00000110 - CYRLLIC_ISO88595
- 00000111 - LATIN_HEBREW_ISO88598
- 00001001 - PICTOGRAM_ENCODING
- 00001010 - ISO2022JP_MUSIC_CODES
- 00001101 - EXTENDED_KANJI_JISX_02121990
- 00001110 - KS_C_5601
And two reserved for special uses:
- 00001011 - RESERVED #1
- 00001100 - RESERVED #2
In short, if your binary body is unicode (UTF-16) you will set dataCoding to 8. If your message is stored as GSM7 then it will (usually) be 0.
It means how text is converted into bytes, since SMPP is a binary protocol but applications typically deal with text strings. The first hit on google for 'smpp data coding' explains it well http://sourceforge.net/apps/trac/smstools/raw-attachment/wiki/MiscWikiFiles/smppv34_gsmumts_ig_v10.pdf in section 2.2.2.
This should definitely help: ETSI GSM 03.38 Specification
来源：https://stackoverflow.com/questions/11985088/meaning-of-data-coding-field-in-smpp