For anyone interested in a com port (rs-232) connection to the e680i i can strongly suggest the Socket cordless serial adapter.



Typically one would use the device in pairs and configure one as the "initiator" and one as the "acceptor" which would then provide essentially a wireless rs-232 cable.

For the e680i, only one unit is required. It can be configured as the "initiator" and specified to use the BT address of the phone; then when powered up it will initiate a BT SPP connection to the phone, and viola, you have a com port. The port is mapped to /dev/pts/X, where X is typically either 1, 2, or 3. When the connection is established the exact location can be read by checking /tmp/bt_spp_devname, for example
Code:
SPP_DEVNAME='cat /tmp/bt_spp_devname'
(thanks to leopardus for this tip!!! its used in his leoppp scripts)

For more information check out the Socket site: http://www.socketcom.com/product/CS0400-479.asp A quick search on pricewatch showed me that the devices are going for about $125 USD.

Some additional comments:
- the device comes w/ an external power supply, but can be powered by applying 5V to pin 9.

- by default the device uses hardware flow control; if your connecting device does not implement this you will have to tie the CTS and RTS lines via a wire.

Some possible uses:
- connection to a GPS receiver
- connection to a RS-232 keyboard
- x10 appliance control

if you have any questions feel free to PM me, i have used this for a couple of pet projects and it is great. I am still trying to get all the bluez stuff to work w/ the BT chip in the phone, but in the meantime this provides an alternative interface for those interested.