Technical information

IPD Activation
E-2 G24 KJAVA User’s Guide July 15, 2008
IPD Activation
The External device will generally have to establish a PPP link over serial, in order to activate the
IPD. This can be done in one of two ways:
1. With GPRS
Issue ATD*99# command and establish PPP link (GPRS dialup). In this case the cellular
network will assign an IP address (IP4 in the figure below) to the external device. External
device may communicate with outside world Internet and the UM using the same PPP link.
Note: Although IP4 is different from IP2, the IPD handles MIDlet IP packets destined to IP2
and redirects them to IP4.
2. Without GPRS
Issue AT+MDLC command and establish PPP link. In this case the IPD will assign the fixed
(AT+MIAU configured) preset IP (IP2 in the figure below), to the External device. The
external device may communicate with UM sockets, but not with the Internet.
Note: For testing purposes only, ATD*98# command will establish the same PPP link with
Windows dialer.
In both cases, the MIDlet is notified of the IPD new state by the IpDirectorAvailabilityListener.
While IPD is active, the External device may access any open MIDlet socket by using the UM fixed
IP (IP1 in Figure E-1 below) as DA.
Figure E-1: IPD Active