AT+i Programmer's Manual - SE Spezial-Electronic AG

MIME Encapsulated E-Mail Messages
AT+i commands may be interlaced within a sequence of AT+iEMB commands, except
for the following AT+i commands: AT+iEMA, AT+iRML, AT+iRMH, AT+iRMM,
AT+iRFU, AT+iRLNK, AT+iBDRA, and AT+iSNMD.
iChip does not limit the size of the binary attachment. However, ISPs do have limitations.
An Internet connection is initiated immediately after the first AT+iEMB command, while
the rest of the command is received. Once the connection to the SMTP server has been
established, iChip acts as a pipeline, receiving binary info from the host, encoding it, and
transmitting it to the Internet on-the-fly. Following the AT+iE* command, the e-mail is
terminated and the Internet connection closed.
The escape sequence command (+++) is allowed within an AT+iEMB command,
provided there is a half-second silence period before the (+++) is sent. Upon receiving the
escape sequence, iChip aborts and orderly closes the Internet session. The partial mail
message is not sent to the destination.
22.2.1 Binary Attachment Parameters
Parameter Default Description
MT 4 (application) Media Type:
0 – Text; 1 – Image ; 2 – Audio ; 3 – Video ;
4 – Application
MST octet-stream Media Subtype String. For a list, see Appendix A.
FN None Attachment File Name (inc. extension). If a file name is
not defined, iChip generates a unique filename without an
extension.
BDY None ASCII text to be included in the e-mail‘s body in addition
to the attachment. (Multiple lines allowed).
Table 22-1 Binary Attachment Parameters
22.2.2 Defining A Textual Body for Binary Messages
1. Permanent textual body contents:
AT+iBDY: … .
The maximum fixed body size allowed is 96 characters (including embedded
). The text body is included in all future binary messages. In addition, the
textual contents are committed to non-volatile memory on board the iChip.
2. Single session textual body contents:
AT+iBDY~ … .
The maximum temporary body size allowed is 1K characters (including embedded
). The text body is included in the next session binary message and then
purged.