So I've come up with the idea recently to use my highly hacked fonera as a temp in-car AP routing a connection off my cellphone through the wireless interface. In theory this should be a piece of cake. Fonera has an open serial port running at 3.3V. The phone has a native serial interface at 3.3V that offers either a standard ppp connection or NMEA gps coordinates when enabled in the phone.

Well, I decided to run with the idea this evening and did a slight hackjob to wire up the fonera's serial header to the computer end of the phone's serial cable. The wiring was as follows:

Fon |  RX <-> TX  | Phone
Fon |  TX <-> RX  | Phone
Fon | Gnd <-> Gnd | Phone

The voltage line on the fonera side was left unconnected since I couldn't find a place to connect it on the phone side. The phone outputs 3.3V to the connected serial devices as well so it'd be kinda stupid to have the two Vcc lines 'running into each other'.

But yeah. Needless to say I couldn't get squat to work. With the phone connected I tried feeding standard AT commands to the phone with no luck. And with NMEA output enabled on the phone, I attempted to cat the serial port with absolutely no output. I'm at a loss. Any ideas what I may have missed would be GREATLY appreciated. Thanks.

I also wanna note that I followed a small page on the dd-wrt wiki where it noted to cross the DTR and DSR and the RTS and CTS lines respectively on the phone side. i DO get the occasional gibberish lines when running a cat on ttyS0 right at the moments I unplug and plug in the phone, but nothing usable.

I guess the serial interfaces are running conflicting baud rates... have you checked ?