To have a permanent serial connection, I created a PPP start-up script, example "/hack/bin/pppstart.sh"
#!/bin/sh
while [ 1 ] ; do
/sbin/custpppd ttyS3 115200 file /etc/ppp-options.cua3
sleep 360
done
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Because you need a way to start the script while not having a connection to your Tivo, I use TRICKEY to start the PPP-serial script
In the trickey config /var/hack/etc/trickey.conf
I added something like this:
| pppStartManual CLEAR,NUM7,NUM7,CLEAR 3 /hack/bin/pppstart.sh & |
So when you press "Clear" 7 7 "Clear" on the remote the ppp process will start and try to make a connection to the PC.
Remember to have your PC ready to be the "SERVER" with the correct Baudrate, etc when you start PPP. And the com port should be available.
Please let me know if you need more detail.