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

["YongLi" <sdliyong@gmail.com>]

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Hello All,

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?

Thanks !

Tyler Li



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