Siemens TC65 - Manual (Page 39)

TC65 JAVA User's Guide
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TC65 JAVA User's Guide_V05 Page 39 of 90 26.09.2005
8 Over The Air Provisioning (OTAP)
8.1 Introduction to OTAP
OTA (Over The Air) Provisioning of Java Applications is a common practice in the Java
world. OTAP describes mechanisms to install, update and delete Java applications over the
air. The TC65 product implements the Over The Air Application Provisioning as specified in
the IMP-NG standard (JSR228).
The OTAP mechanism described in this document does not require any physical user
interaction with the device; it can be fully controlled over the air interface. Therefore it is
suitable for Java devices that are designed not to require any manual interaction such as
vending machines or electricity meters.
8.2 OTAP Overview
To use OTAP, the developer needs, apart from the device fitted with the TC65 module, an
http server, which is accessible over a TCP/IP connection either over GPRS or CSD, and an
SMS sender, which can send Class1, PID $7d short messages. This is the PID reserved for
a module’s data download.
Java Application Server
(HTTP Server)
.jar file
.jad file
Device containing TC65
.jad file
.jar file
OTAP Controller
(SMS Sender)
HTTP/TCP/IP
over GPRS/CSD
SMS
Cla
ss1,
Pid
$7d
Figure 17: OTAP Overview
The Java Application Server (http Server) contains the .jar and the .jad file to be loaded on
the device. Access to these files can be protected by http basic authentication.
The OTAP Controller (SMS Sender) controls the OTAP operations. It sends SMs, with or
without additional parameters, to the devices that are to be operated. These devices then try
to contact the http server and download new application data from it. The OTAP Controller
will not get any response about the result of the operation. Optionally the server might get a
result response over http.
There are two types of OTAP operations:
• Install/Update: A new JAR and JAD file are downloaded and installed.
• Delete: A complete application (.jar, .jad, all application data and its directory) is deleted.