Re: [Bluez-users] ISSC Bluetooth dongle + GPS receiver problem

[Marcel Holtmann <marcel@holtmann.org>]

Hi,

> I am testing the ISSC Bluetooth dongle on my ARM platform. I am using Linux 2.6.16 kernel and bluez-utils 3.9. I can connect to a Bluetooth headphone. However, if I connect the USB dongle to a Bluetooth GPS receiver, the connection is broken sometimes. I performed the below steps:
> 
> 1. Insert the ISSC USB dongle to USB port
> 2. run command "hciconfig hci0 up"
> 3. run command "hcitool scan"
> 4. the dongle find the GPS receiver and output the below message: 
> Scanning ...
>         00:0B:0D:76:14:FE       BT-GPS
> 5. run command "rfcomm bind rfcomm0 00:0B:0D:76:14:FE"
> 6. run command "cat /dev/rfcomm0"
> 
> I can get the gps information like that: 
> $GPGSA,A,1,,,,,,,,,,,,,,,*1E
> 
> $GPRMC,034415.781,V,,,,,,,160407,,,N*40
> 
> $GPGGA,034416.769,,,,,0,00,,,M,0.0,M,,0000*5A
> 
> $GPGSA,A,1,,,,,,,,,,,,,,,*1E
> 
> However, the connection is broken after a random time. If I run the hcidump -x command on another terminal, the error message is:
> > HCI Event: Number of Completed Packets (0x13) plen 5
>   01 01 00 01 00 
> > ACL data: handle 1 flags 0x02 dlen 17
>     L2CAP(d): cid 0x0040 len 13 [psm 3]
>       RFCOMM(d): UIH: cr 0 dlci 2 pf 0 ilen 9 fcs 0x40 
>       47 50 47 47 41 2C 30 33 34 
> < ACL data: handle 1 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0040 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 1 fcs 0x9a 
>       47 
> > ACL data: handle 1 flags 0x02 dlen 17
>     L2CAP(d): cid 0x0040 len 13 [psm 3]
>       RFCOMM(d): UIH: cr 0 dlci 2 pf 0 ilen 9 fcs 0x40 
>       34 33 36 2E 37 38 31 2C 2C 
> < ACL data: handle 1 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0040 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 1 fcs 0x9a 
>       50 
> < ACL data: handle 1 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0040 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 1 fcs 0x9a 
>       47 
> < ACL data: handle 1 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0040 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 1 fcs 0x9a 
>       47 
> < ACL data: handle 1 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0040 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 1 fcs 0x9a 
>       41 
> < ACL data: handle 1 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0040 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 1 fcs 0x9a 
>       2C 
> < ACL data: handle 1 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0040 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 1 fcs 0x9a 
>       30 
> < ACL data: handle 1 flags 0x02 dlen 9
>     L2CAP(d): cid 0x0040 len 5 [psm 3]
>       RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 1 fcs 0x9a 
>       33 
> < HCI Command: Reset (0x03|0x0003) plen 0
> Receive failed: Broken pipe
> 
> It seems that the ISSC BT dongle is incompatible with BlueZ, anyone encounters the same issue?

actually the ISSC dongle is broken and from my experience a really badly
implemented Bluetooth chip. You are really better of if you get yourself
a CSR BlueCore4 based dongle.

Regards

Marcel



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