B20/BT2.1
User Guide
Release r03
www.stollmann.de
Page 24 of 38
7 OBEX File Transfer
This chapter describes the Object Push Profile (OBEX transfer) implementation in the
B20 firmware.
This Bluetooth module supports the Object Push Profile in client mode only (OPP
client). Therefore the Bluetooth module initiates an outgoing call to the OBEX server
side.
The OPP client call request, the OPP frame structure and different connection
examples will be described below.
7.1 OPPC Call Request
To initiate a Bluetooth connection using the service p
rofile “OPP” the dial command
needs the additional identifier “OPPC” or the UUID “1105”.
Example:
ATD<Bluetooth address>,OPPC
ATD<Bluetooth address>,1105
After the destination device accepts the call request from the B20 module the
message “CONNECT” is sent to the local serial interface.
7.2 OPP Frame Structure
After the connection is established the B20 can send the OPP frame as
specified below:
Length
<sp>
Filename
<sp> MIME Type
<sp>
Data
Length
Length of the data field, 8 digits, ASCII decimal coded, filled with
leading zero
Filename
File name of the transmitted data, i.e “test.vcf”
MIME Type
Type according RFC 2045, i.e. “image/jpeg” or “text/plain”
Data
Data (payload) of the transmitted object
<sp>
Field separator <SPACE> (0x0D)
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