setting bdaddr on ISSC adapters
Like so many before me, I ended up with an ISSC USB adapter with an address of 11:11:11:11:11:11. This is the adapter manufacturer being cheap and omitting the USD $.10 EEPROM chip, and the firmware using that address as a default in lieu of anything better.
This annoyed me, so I played around with the bdaddr program in bluez-utils. I found that the MAC address can be set with the same commands used for "Ericsson" adapters. One small patch later, I had set a new MAC address on that adapter, at least until it's powered off.
Marcel Holtmann has coded up a more complete solution in the CVS source (it'll be in the next released version), but here is a minimal patch that will apply to later 2.x versions of bluez-utils. If it doesn't apply automatically, patching by hand should be fairly obvious.
bdaddr.c renamed from bdaddr.c.orig +2 -0
@@ -249,6 +249,8 @@ { 10, csr_write_bd_addr, csr_reset_device }, { 13, ti_write_bd_addr, NULL, }, { 18, zeevo_write_bd_addr, NULL }, +/* ISSC dongles seem to work with ericson commands. */ + { 57, ericsson_write_bd_addr, NULL }, { 65535, NULL, NULL }, };
After running this patched bdaddr, you'll need to do 'hciconfig hci0 reset' to get the new address to show.
It's only been tested on two or three adapters so far. Since the ISSC adapters with these default MAC addresses (11:11:11:11:11:11 or 22:22:22:22:22:22) apparently have no writeable, nonvolatile storage, there should be no risk of making unrecoverable changes to the adapter.
I suggest taking the MAC address of the machine's first ethernet adapter, setting bit 2 of the first byte to 1 to get a "locally-administered" address that will be unique, and setting that on your adapter.
Setting the MAC address to something unique and valid should clear up some difficulties with PAN networking (I can't test this), and allow using more than 1 of these dongles together (I can't test this either).
If you have any problems with this, let Marcel and I know.
--jh
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