Sony Ericsson RC function Istruzioni per l'installazione e il funzionamento

Application Note

Use of the RC function

for remote script download

First edition (January 2004)

Sony Ericsson Mobile Communications. publishes this manual without making any warranty as to the

content contained herein. Further Sony Ericsson Mobile Communications. reserves the right to make

modifications, additions and deletions to this manual due to typographical errors, inaccurate information,

or improvements to programs and/or equipment at any time and without notice. Such changes will,

nevertheless be incorporated into new editions of this manual.

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Contents

1INTRODUCTION.............................................................................................................. 4

2OVERVIEW...................................................................................................................... 5

2.1 GENERAL ....................................................................................................................... 5

2.2 CONTROL PC SETUP ....................................................................................................... 5

2.3 REMOTE GR47 SETUP.................................................................................................... 6

2.4 SECURITY ASPECTS ........................................................................................................ 6

2.4.1 SMS ...................................................................................................................... 6

2.4.2 CLIP ...................................................................................................................... 6

APPENDIX I EMBEDDED APPLICATION CODE...................................................................... 7

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1 Introduction

The GR47 has been designed so that scripts embedded within the device

can be updated either through a serial interface on UART1 or where this is

not feasible, due to location, remotely using the air interface. The script

resident in the device must be written in a way that makes remote access

permissible and preferably with some form of authentication of the calling

party.

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2 Overview

2.1 General

The remote script download is dependant on the currently active script

within the GR47 having the RC intrinsic function capability written in such

a way that once a CSD data call is received, the RC intrinsic function is

called and the remote script download takes place. Once the script is

down loaded into GR47 memory and all checksums are verified, the GR47

is reset and on completion of the power up routine the new downloaded

script is activated.

It is imperative that the new script downloaded using the over the air

routine also has the RC functionality written into it as once the new script

is activated and running, then without having the RC functionality active,

the script will not be able to be updated again.

The remote download process takes care of script number allocation and

will use whatever script number is not being used by the activated script.

This ensures that the original script is not lost and can be activated again

if the new script is not functioning as expected.

Note.

It is very important that the new script to be downloaded using the remote

download facility has been checked thoroughly for possible bugs or run

time errors. As once the script is downloaded and activated, it is not

possible to gain remote access again if the script has crashed and is not

running.

2.2 Control PC setup

The remote PC will require the latest IDE to be installed and preferably

connected by UART1 to a GSM modem and the script to be downloaded

needs to be open in the main IDE screen.

Select the yellow telephone icon next to the main script download button

in the tools menu. A pop up box will ask for the data telephone number of

the GR47 you are going to download a script to. Enter the number and

select OK and wait for the remote download pop up to appear.

Once the remote download popup appears select download and the script

will be downloaded to the remote device. Progress can be monitored on

the download bar as a percentage to completion. Once the download has

finished, you must select the EXIT button on the download popup which

will reset the remote device and the new script will be run on power up.

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2.3 Remote GR47 Setup

The GR47 that is to have its script updated by using the RC function must

have a script with the RC functionality active as part of the main loop

within the script structure (example below). The remote GR47 must also

have a SIM card with a data number to allow the setup of a CSD data call.

Progress of the remote script download can be monitored on UART2 as

part of the debug data. This is done with the use of printf statements within

the RC function and with PRS(0) set to turn off normal debug.

2.4 Security aspects

When implementing the code some thought should be given to ensuring

that no one else can dial into the module and perform an unauthorised

download which might disable the application or cause it to run incorrectly.

Two methods are described below which should be easy to implement

and are quite secure in their operation as they use standard functionality

which is built into most GSM networks

2.4.1 SMS

The script attached to this application note relies upon a data call being

received and then switching the RC function on. This can also be done in

reverse i.e. the unit can make a phone call and then the RC function

switched on. The call could be triggered by an incoming SMS, the format

of which, is recognised by the script i.e. the text of the SMS could be

‘Update required: code 1234 call service centre’

this should be sent from known number

This method has the additional advantage of not requiring data phone

numbers for each of your SIM’s as all units can make data calls.

2.4.2 CLIP

Alternatively the script below could be adjusted to activate CLIP (Caller

Line Presentation) and only answer the call if it recognised that the call

was from its service centre.

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Appendix I Embedded Application Code

The following code sample (using Sony Ericsson’s M2mpower help file)

can be used to set-up the RC functionality within a script.

/* This example shows how simple Over the Air Download can work

using the RC function. */

int Rslt;

RemoteMode ()

{

int st = 0;

int first;

int num;

int connect;

int cnt;

st = 0;

cnt = 0;

chcrt (1);

prtf("\nRemote Mode\n");

/* auto answer on data channel */

chw (1, "ATS0=1\n\r", 8);

/* wait for data mode */

st = 0;

first = 1;

while (st == 0 && cnt < 60)

{

/* check status of call every second */

dlys (1);

cnt++;

st = chsts (1);

/* check for DCD */

st = st & 0x02;

}

/* setup remote control */

while (st != 0)

{

if (first == 1)

{

st = rc (1);

prtf ("rc status NUMBER 1 = %d\n", st);

first = 0;

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}

else

{

/* check status of call every second */

dlys (1);

prtf ("online status NUMBER 1 = %d\n", st);

st = chsts(1);

st = st & 0x02;

}

if (first == 0)

{

/* disable remote control and reset the module */

prtf ("disable rc\n");

rc(0);

rst(0);

}

EstablishTCP()

{

return(0);

}

main ()

{

int chlerr;

char chlsts;

int APPS_NETWORK_STATUSBYTE = 10;

int AT_NET_REGISTERED = 1;

prs(0);

prtf("\r\n Waiting for Network registration...");

while(gtb(APPS_NETWORK_STATUSBYTE) != AT_NET_REGISTERED)

{

dlys(1);

}

prtf("\r\n Now registered!");

while (1)

{

prtf ("\r\n - Beginning TCP setup...");

Rslt = EstablishTCP();

prtf ("\r\n >>> EstablishTCP() result: ");

if (Rslt == 0)

{

prtf ("\r\nOK!");

}

else

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{

prtf ("\r\nFAILED!");

}

RemoteMode ();

prtf ("\r\n\nScript Complete!");

}

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