[Bluez-users] RFCOMM Connection Handy to Bluez Application on Linux

[Bluez-users] RFCOMM Connection Handy to Bluez Application on Linux

[Mariusz Dziuba]

Hello, 

I need some help. I try to connect my Java Handy Application with my Bluez Bluetooth Application on Linux. I will start a serial connection between both devices (RFCOMM).
For my Test I found this Code for an Bluetooth Server:

	#include <netinet/in.h>
	#include <arpa/inet.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	
	#include <bluetooth/bluetooth.h>
	#include <bluetooth/rfcomm.h>
	
	#define CHANNEL 4
	#define QUEUE 10
	
	int main(void)
	{
		int sock, client, alen;
		struct sockaddr_rc addr;
		
		sock = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
		if(sock < 0)
		{
			perror("socket");
			exit(1);
		}
		
		addr.rc_family = AF_BLUETOOTH;
		bacpy(&addr.rc_bdaddr, BDADDR_ANY);
		addr.rc_channel = htobs(CHANNEL);
		alen = sizeof(addr);
		
		if(bind(sock, (struct sockaddr *)&addr, alen) < 0)
		{
			perror("bind");
			exit(1);
		}
		
		listen(sock,QUEUE);
		printf("Waiting for connections...\n\n");
		
		while(client = accept(sock, (struct sockaddr *)&addr, &alen))
		{
			printf("Got a connection attempt!\n");
			close(client);
		}
		
		close(sock);
		return 0;
	}

On my Handy I'm programming the Client in Java unsing JSR 82. In my Application I can find the Linux Device, but if I'm scanning for services (RFCOMM) there will be found no services!
If I scan my Windows Laptop with the same Application, there are many services. Like this:
btspp://000B7C59C010:1,encrypt=false;authenticate=false;master=false
btspp://000B7C59C010:2,encrypt=false;authenticate=false;master=false
btspp://000B7C59C010:3,encrypt=false;authenticate=false;master=false
...

What I'm doing wrong?!
Can some one help me with this problem. I'm really desperate.

Thanx Marius
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Re: [Bluez-users] RFCOMM Connection Handy to Bluez Application on Linux

[Marcel Holtmann]

Hi Marius,

> I need some help. I try to connect my Java Handy Application with my Bluez Bluetooth Application on Linux. I will start a serial connection between both devices (RFCOMM).
> For my Test I found this Code for an Bluetooth Server:
> 
> 	#include <netinet/in.h>
> 	#include <arpa/inet.h>
> 	#include <sys/types.h>
> 	#include <sys/socket.h>
> 	
> 	#include <bluetooth/bluetooth.h>
> 	#include <bluetooth/rfcomm.h>
> 	
> 	#define CHANNEL 4
> 	#define QUEUE 10
> 	
> 	int main(void)
> 	{
> 		int sock, client, alen;
> 		struct sockaddr_rc addr;
> 		
> 		sock = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
> 		if(sock < 0)
> 		{
> 			perror("socket");
> 			exit(1);
> 		}
> 		
> 		addr.rc_family = AF_BLUETOOTH;
> 		bacpy(&addr.rc_bdaddr, BDADDR_ANY);
> 		addr.rc_channel = htobs(CHANNEL);
> 		alen = sizeof(addr);
> 		
> 		if(bind(sock, (struct sockaddr *)&addr, alen) < 0)
> 		{
> 			perror("bind");
> 			exit(1);
> 		}
> 		
> 		listen(sock,QUEUE);
> 		printf("Waiting for connections...\n\n");
> 		
> 		while(client = accept(sock, (struct sockaddr *)&addr, &alen))
> 		{
> 			printf("Got a connection attempt!\n");
> 			close(client);
> 		}
> 		
> 		close(sock);
> 		return 0;
> 	}
> 
> On my Handy I'm programming the Client in Java unsing JSR 82. In my Application I can find the Linux Device, but if I'm scanning for services (RFCOMM) there will be found no services!
> If I scan my Windows Laptop with the same Application, there are many services. Like this:
> btspp://000B7C59C010:1,encrypt=false;authenticate=false;master=false
> btspp://000B7C59C010:2,encrypt=false;authenticate=false;master=false
> btspp://000B7C59C010:3,encrypt=false;authenticate=false;master=false
> ...
> 
> What I'm doing wrong?!

you need to register a SDP service record for your server. Example for
this can be found in pand and sdptool.

Regards

Marcel




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