i test serial port via usb2serial converter with mr3020
driver usb to serial i install
opkg update opkg install kmod-usb-serial opkg install kmod-usb-serial-ftdi
Refference:
http://smartcity.cs.columbia.edu/openwrt/openwrt_packages.php
this source code on mr3020 run with shell script and arduino board run with softwareserial
http://forum.arduino.cc/index.php/topic,39485.0.html
http://arduino.cc/en/Reference/SoftwareSerial
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