Build your own Wifi radio

Step 5 Setting the baudrate and echo

Before we can start to communicate with our router, we need to change its baudrate. The routers baudrate is 115200 and we want it to be 9600 (I was told that 19200 works fine too). Another thing we should change is the echo. Now the router echos back every charater that we sent to it and that would make our Uart-buffer a mess, so we need to turn that off.

I tried to write a script for the router to change those 2 things and to make that script autostart when the router starts up. The script was working fine but it just wouldn't start by itself (most probably something caused by my inexperience). So I decided to look for a script that was running for sure at startup and add a few lines to that.

I found a script named diag.sh in the etc/ folder. It drives the LED's in front of the router. So I added my code to that script and it worked like a charm.

To do that yourself, telnet or shh to router and type vi etc/diag.sh into your console. Now you should see the code. Press I to edit and add stty 9600 -echo < dev/tts/0 just below the header. Then press Esc and :x enter to save it and to close the editor. Then type reboot into your console to reboot the router.

When the router has rebooted, the baudrate should be correct and the echo off.