[Bluez-devel] sending SAP messages on rfcomm?

[Bluez-devel] sending SAP messages on rfcomm?

[Götz Issel]

Hi,
I am still trying to get the remote SimAccessProfile SAP to work. I habe
a BT scanner too now, showing me all in detail down to single bits and I
saw that my sent messages are not being sent.

This is what I have done:

--> search for devices that offer SAP service (standard sdp search and
filter out "the good ones")

--> pairing with the SIM-Server mobile phone using 16 digits pin as
required, works fine 

--> connect to the phone via rfcomm on the channel given by sdp search
before (i.e. nokia 6810 needs #4, siemens s65 wants #6 etc) and here the
phone asks again for allowance to access the SIM. Good sign so far.
     ...
    // allocate a socket
    rfcomm_sock = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);

    // set the connection parameters (who to connect to)
    addr.rc_family = AF_BLUETOOTH;
    addr.rc_channel = (uint8_t) dest_channel;  // dest_channel depends
on mobile phone
    
    str2ba( dest, &addr.rc_bdaddr );  // dest is the string of the
bdaddr of mobile phone

	printf("\r\nrfcomm connect to %s on channel %i",dest,dest_channel);
	fflush(stdout);

    // connect to server
    status = connect(rfcomm_sock, (struct sockaddr *)&addr, sizeof(addr));
    ...

--> now sending the 1st sap message "CONNECT_REQ" like this (bad style,
i know, only testing)

int send_connect_req(int sock)
{
    int status;
    unsigned char message[12] = {};

    message [0]  = 0x00; // message ID, here connection req
    message [1]  = 0x01; // number of parameters
    message [2]  = 0x00; // reserved
    message [3]  = 0x00; // reserved
    message [4]  = 0x00; // parameter ID, here MaxMsgSize
    message [5]  = 0x00; // reserved 
    message [6]  = 0x00; // parameter length high byte
    message [7]  = 0x02; // parameter length low byte
    message [8]  = 0x01; // parameter value high byte
    message [9]  = 0x18; // parameter value low byte
    message [10] = 0x00; // padding byte
    message [11] = 0x00; // padding byte
    
    status = write(sock, &message, sizeof(message));
    return status;
}
 

--> using hcidump shows, that the essage is sent in some way,look at end
of  http://sap.goetzi.de/hci_dump_sap_1st_msg.txt 

I have the feeling i am missing something. Any suggestions? Is "write()"
the correct way? Do I have to define a new type of packet somewhere
first? I amlost and my deadline for handing in my project at uni is
coming closer. Any help appreciated, please.

Thanks,
Goetz



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Re: [Bluez-devel] sending SAP messages on rfcomm?

[Marcel Holtmann]

Hi Goetz,

> --> using hcidump shows, that the essage is sent in some way,look at end
> of  http://sap.goetzi.de/hci_dump_sap_1st_msg.txt 

in the future you should use "hcidump -X -V", because nobody is going to
decode the HCI commands and events for you by hand.

> I have the feeling i am missing something. Any suggestions? Is "write()"
> the correct way? Do I have to define a new type of packet somewhere
> first? I amlost and my deadline for handing in my project at uni is
> coming closer. Any help appreciated, please.

I don't have a SIM access capable phone and thus I never played with
this profile. And I won't do that until someone donates a SIM access
phone to me.

Regards

Marcel




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Re: [Bluez-devel] sending SAP messages on rfcomm?

[Mayank Batra]

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Hi *Götz,*

On 6/16/06, Götz Issel <g.issel@fh-wolfenbuettel.de> wrote:
>
> Hi,
> I am still trying to get the remote SimAccessProfile SAP to work. I habe
> a BT scanner too now, showing me all in detail down to single bits and I
> saw that my sent messages are not being sent.
>
> This is what I have done:
>
> --> search for devices that offer SAP service (standard sdp search and
> filter out "the good ones")
>
> --> pairing with the SIM-Server mobile phone using 16 digits pin as
> required, works fine
>
> --> connect to the phone via rfcomm on the channel given by sdp search
> before (i.e. nokia 6810 needs #4, siemens s65 wants #6 etc) and here the
> phone asks again for allowance to access the SIM. Good sign so far.
>     ...
>    // allocate a socket
>    rfcomm_sock = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
>
>    // set the connection parameters (who to connect to)
>    addr.rc_family = AF_BLUETOOTH;
>    addr.rc_channel = (uint8_t) dest_channel;  // dest_channel depends
> on mobile phone
>
>    str2ba( dest, &addr.rc_bdaddr );  // dest is the string of the
> bdaddr of mobile phone
>
>        printf("\r\nrfcomm connect to %s on channel %i",dest,dest_channel);
>        fflush(stdout);
>
>    // connect to server
>    status = connect(rfcomm_sock, (struct sockaddr *)&addr, sizeof(addr));
>    ...
>
> --> now sending the 1st sap message "CONNECT_REQ" like this (bad style,
> i know, only testing)
>
> int send_connect_req(int sock)
> {
>    int status;
>    unsigned char message[12] = {};
>
>    message [0]  = 0x00; // message ID, here connection req
>    message [1]  = 0x01; // number of parameters
>    message [2]  = 0x00; // reserved
>    message [3]  = 0x00; // reserved
>    message [4]  = 0x00; // parameter ID, here MaxMsgSize
>    message [5]  = 0x00; // reserved
>    message [6]  = 0x00; // parameter length high byte
>    message [7]  = 0x02; // parameter length low byte
>    message [8]  = 0x01; // parameter value high byte
>    message [9]  = 0x18; // parameter value low byte
>    message [10] = 0x00; // padding byte
>    message [11] = 0x00; // padding byte
>
>    status = write(sock, &message, sizeof(message));
>    return status;
> }
>
>
> --> using hcidump shows, that the essage is sent in some way,look at end
> of  http://sap.goetzi.de/hci_dump_sap_1st_msg.txt
>
> I have the feeling i am missing something. Any suggestions? Is "write()"
> the correct way? Do I have to define a new type of packet somewhere
> first? I amlost and my deadline for handing in my project at uni is
> coming closer. Any help appreciated, please.


In fact, a few days ago, I was also trying to do the same experiment.
I think that you are doing it correctly, i.e the sap connection request
looks ok to me.
Try changing the maxmasg size parameter of the request to something else.
So what happens after you send the connect req?
Don't you get any response back from the phone?


Regards,
Mayank

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