Siemens AC75 manual Related AT Commands, Establishing an RSA Connection in a PC Environment

AC75 AT Command Set

15.3 Related AT Commands

15.3Related AT Commands

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The following commands might be of interest while using the RSA feature.

•AT^SCKS

This AT command is used to check the current status of the SIM (local or remote).

•AT^SSET

After power on and personalization (PIN entry if required), the ME starts reading data from the SIM. Please keep in mind that after entering the PIN, even after the TE sends "OK", subsequent commands that need access to data stored on the SIM may be blocked for up to 30 seconds. It may take even longer to access the remote SIM depending on the establishment of the RSA communication link. Therefore, it is recommended to take advantage of the "^SSIM READY" URC enabled with the AT^SSET command. This URC notifies the user when the process of reading SIM has completed. Afterwards all commands regarding to SIM data files can be used, e.g. the SMS and phonebook commands.

•AT+CLCC

This command is recommended for querying the state of current calls. A list of all active calls will be returned. This is especially important when the user wants to terminate the SAP connection using

AT^SRSA=<devId>,<sapRole>,,,,<discType>; with <sapRole> set to 0 and <discType> set to 1. All calls or active GPRS contexts established via remote SIM will be terminated and the ME will use the locally attached SIM card.

•SIM data storage

It is recommended that all user relevant data are stored on the SIM only. For example, added phonebook and SMS entries in the client's storage are not accessible after a RSA connection.

15.3.1Establishing an RSA Connection in a PC Environment

To set up an RSA connection in a PC environment an appropriate PC application is needed. For test and eval- uation purposes and as exemplary implementation guidance Siemens offers a PC application called "Com- Bridge". For ordering details contact your local Siemens dealer. "ComBridge" provides basic features to simulate an RSA application environment, e.g. mapping of the SAP communication between a SAP server and client. To support the different RSA coding modes (SAP and XSAP) and to transfer data between the two COM ports, the PC application uses two variable modules (filters):

•XSAP filter

Translating the "^SRSM" URCs into the AT^SRSM command

•SAP filter

Transparently transfer binary SAP messages. The generic "1:1" filter ("software null modem") can also be used for this purpose, but communication might be slower since it performs bytewise data transfer.

15.3.2Bluetooth scenario (SAP)

A connection between a cellular engine operating as a SAP client and an ME that supports Bluetooth and SIM Access profile requires:

a) System requirements

•Windows 2000, Windows XP (or later) installed

•USB Bluetooth dongle. It is recommended to use the Fujitsu-Siemens product with the "PlugFree" Bluetooth driver. This driver allows connections to Bluetooth profiles which are not yet specified by the SIG, e.g. SAP.

b) Installation procedure

•After installing the USB Bluetooth dongle and the "PlugFree" driver software, the Bluetooth profiles are acces- sible via their own virtual COM port.

•If the WinMux driver has been installed another three virtual channels (mapped to additional COM ports) are available. The physical Multiplexer COM port is connected to the cellular engine.

AC75_ATC_V01.002	Page 426 of 569	10/30/06
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