Why can't youbot_battery_monitor connect to serial port? [closed]

edit

Hi,

i am trying to get youbot_battery_monitor running on my youbot. The README (cannot post link, please check yourself on google) says i could run youbot_battery_monitor as standalone program. But when i try to run it with

$ ./home/youbotuser/Software/catkin_ws/devel/lib/youbot_battery_monitor/youbot_battery_monitor /dev/youbot/lcd_display eth1 wlan0 &

it says "could not to connect to serial port: /dev/youbot/lcd_display"

I wrote a udev rule 110-battery.rule:

SUBSYSTEM=="usb", ATTRS{idVendor}=="16d0", ATTRS{idProduct}=="059d", SYMLINK+="youbot/lcd_display", RUN+="/home/youbotuser/Software/catkin_ws/src/youbot_diagnostics/youbot_battery_monitor/youbot_battery_monitor.sh"

My youbot_battery_monitor.sh looks like this:

#!/bin/bash

export ROS_MASTER_URI=http: //localhost:11311

/home/youbotuser/Software/catkin_ws/devel/lib/youbot_battery_monitor/youbot_battery_monitor /dev/youbot/lcd_display eth1 wlan0 &

The udev rule seems to be working. It at least generates the /dev/youbot/lcd_display file. But i am not really sure about using SUBSYSTEM=="usb"?!

I don't use the youbot that long yet. I'd really much appreciate any help. Thanks a lot.

Edited after ahendrix 2nd comment:

I think i finally solved the problem why it cannot connect to the serial port. But it is still not running properly yet. I can execute youbot_battery_monitor.sh by typing "sudo bash youbot_battery_monitor.sh". I obviously needed the root rights i got by adding sudo.

This is the output i get then:

sudo bash youbot_battery_monitor.sh

youbotuser@Jakobs-youBot:~/Software/catkin_ws/src/youbot_diagnostics/youbot_battery_monitor$ try to connect to serial port: /dev/youbot/lcd_display

serial port /dev/youbot/lcd_displayis already open

connected to serial port: /dev/youbot/lcd_display

[W ]

[L ]

[W ]

[L ] ....

Every time it prints [W ] and [L ] it is beeping.