Erva的专栏

danilo的东西 如果编译有问题就换gcc为更早的版本就好

creat: $ ln -s original_file new_file remove $unlink net_file

?system log to check if ip address is settled $ sudo vi /var/log/syslog update linux version: $ sudo apt-get install linux-image-generic-lts-quantal check system version $ sudo unam

1. rt-wmp tran/recv test between two laptop 2. uvc_camera installation on two laptop 3. Experiment:        Distance vs. RSSI vs. Channel      1/3/5/10                            1-14(check availab

If pcap.h is missing, install libpcap pkg. $ sudo apt-cache search libpcap Then install the right one $ sudo apt-get install libpcap

1. find librt-wmp.a $ find . -name librt-wmp.a $ md5 filename $ file filename 2. /ros_rt_wmp/ $mkdir bin $ cp rt-wmp/lib/librt-wmp.a bin/ 3. /ros_rt_wmp vi CMakefile add:

Regarding the fact that not all the flows are working, I thinks the problem is that the bandwidth is not enough. Looking at the config.h I can see that you've three video flows sources and 3 destin

To change the priority of some R1 topic FROM R1, you have to call the service: /R1/wmp_control while if you have to change the priority of some R0 topic again FROM R1 you have to call the serv

Regarding the fact that not all the flows are working, I thinks the problem is that the bandwidth is not enough. Looking at the config.h I can see that you've three video flows sources and 3 desti

Under Statistics: Flows->Global Flow you have the fields 1. "Message delivery delay + PAP" that indicates the delay of delivery including the corresponding PAP 2. "By priority (Ages)" that indic

查看网络的情况,比如各个cell $ iwlist scan 或者 $ sudo iwlist wlan0 scan 查看无线网卡的型号: $ sudo lshw -C network 然后在google上搜索一下“（XXX型号）wifi can not set as adhoc mod” 网上直接查“adhoc network c

Regarding the dynamic change of the priorities: To get the priority of the topic '/add_two_ints' for example you have to call: rosservice call /R0/wmp_control [0,0,0] 6 0 0 /add_two_ints

cd /etc/NetworkManager/system-connections sudo rm {wireless_hotspot_name}

自动连接网络的关闭: sudo /etc/init.d/network-manager stop 开启: sudo /etc/init.d/network-manager start或者是restart ping: ping不通,有时候是因为iwconfig能显示出来的那个Cell不统一,要用iwconfig waln ap mac,或者reboot. 把Cel

cd /etc/udev/rule.d/ sudo vi 70-persistent-net.rules 修改 # USB device 0x7392:0x7811 (usb) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="80:1f:02:35:89:2 e", ATTR{dev_id}=="0x0", 

Fitpc: 1. 安装vim, screen, chrony, subversion, git ; 2. scp wang@wang-desktop:/home/wang/.bashrc; 3. modify /et/hosts; 4. add ssh trust:        - $ ssh-keygen   (epuck 3)        - $ ssh-copy-id wa

$ rosrun ros_rt_wmp_sniffer ros_rt_wmp_sniffer man0 => GUI出来: click record 修改 configure.h 相关发送接收数据的node数目等信息. *Key points: 在运行 rosrun *node*之前,先设置ad-hoc网络,保证nodes之间能够ping通.

1. updated epuck module 8192cu.ko (removed "dep"?不确定) 2. copied tan's codes & new 8192cu_ming.ko to SD card 3. made a backup of worked card on wang-deskop: /home/epuck_backup/epuck_ros-rt-wmp_wifi

首先,在文件 /etc/udev/rules.d/70-persistent-net.rules 改好wlan0及其相对应的mac地址. 不过仍然连不上,报错:error for wireless request set ad-hoc mode (8b06) set failed on device wlan0 operation not permitted (不过后来验证发现:造成这个err

To run a shell script you first give it permissions: chmod u+x nameofthescript Then you run it. Assuming you're in the directory where the script is: ./nameofthescript If it needs to run w

Note: 交叉编译(以下所有操作 如果没有特殊说明一般的命令都是在laptop上运行的, 再拷贝到epuck上) 总结,交叉编译就是把 所有应该用gcc的地方换成arm-linux-gcc. 需要在32-bit上面运行, 64位主要的问题是由于编译器不同,导致那个sniffer在显示的时候有问题. 对于kernel编译方面没什么影响.  PS: 怎么查看本机cpu是几位的呢？命令：

1. Ctrl-a c 打开新的terminal窗口 2. Ctrl-a space 不同的窗口之间的切换 3. Ctrl-a r 恢复之前由于网络\串口连接中断的窗口 查询 screen 用法: $ man screen

ERROR: mkdir -p bin cd build && cmake -Wdev -DCMAKE_TOOLCHAIN_FILE=/core/rosbuild/rostoolchain.cmake .. CMake Error at /usr/share/cmake-2.8/Modules/CMakeDetermineSystem.cmake:95 (MESSAGE):

查找laptop的wifi内核模块： $ modprobe