yarn install ubuntu 20.04

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 yarn install ubuntu 20.04


wrong installed screen






just follow this command 

curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -

echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list

sudo apt update

sudo apt install yarn

yarn --version












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mount 명령 ( 읽기 권한만 있는놈 쓰기 권한 주기 )

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#mount ( 리스트를 출력한다. ) rootfs / rootfs ro,relatime 0 0 tmpfs /dev tmpfs rw,relatime,mode=755 0 0 devpts /dev/pts devpts rw,relatime,mode=600 0 0 proc /proc proc rw,relatime 0 0 sysfs /sys sysfs rw,relatime 0 0 none /acct cgroup rw,relatime,cpuacct 0 0 tmpfs /mnt/asec tmpfs rw,relatime,mode=755,gid=1000 0 0 none /dev/cpuctl cgroup rw,relatime,cpu 0 0 /dev/block/mtdblock3 /system yaffs2 ro,relatime 0 0 /dev/block/mtdblock5 /data yaffs2 rw,nosuid,nodev,relatime 0 0 /dev/block/mtdblock4 /cache yaffs2 rw,nosuid,nodev,relatime 0 0 /sys/kernel/debug /sys/kernel/debug debugfs rw,relatime 0 0 /dev/block/vold/179:1 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0 /dev/block/vold/179:1 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,short...
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c# mqtt client example

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using uPLibrary.Networking.M2Mqtt; using uPLibrary.Networking.M2Mqtt.Messages; namespace MQTTTest {     public partial class Form1 : Form     {         MqttClient client;         public Form1()         {             InitializeComponent();             //client = new MqttClient("broker.hivemq.com");             client = new MqttClient("192.168.0.83");             byte code = client.Connect(Guid.NewGuid().ToString());             client.ProtocolVersion = MqttProtocolVersion.Version_3_1;            ...
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비글본 블랙 고정 아이피 설정

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아래에 링크를 참조 하시면 됩니다. https://github.com/leesy24/BBB_Web_Manager/wiki/%5BBBB%5D-Set-static-IP-address-on-eth0 /etc/network/interfaces  를 변경하여도 정상적으로 동작하지 않습니다. 위에 링크에 있는 내용을 따라서 하시면 됩니다. 명령어  ip addr show dev eth0  을 입력하면 아래와 같이 나옵니다. 2: eth0: <BROADCAST,MULTICAST,DYNAMIC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000     link/ether de:ad:be:ef:ca:be brd ff:ff:ff:ff:ff:ff     inet 192.168.0.88/24 brd 192.168.0.255 scope global eth0        valid_lft forever preferred_lft forever     inet 192.168.0.112/24 brd 192.168.0.255 scope global secondary eth0        valid_lft forever preferred_lft forever     inet6 fe80::6a9e:19ff:fe6f:64f/64 scope link        valid_lft forever preferred_lft forever connmatctl services  해서 나오는  ethernet_689e196f064f_cable ( 이더텟 인터페이스) 을  아래와 같이 설정하면 됩니다. connmanctl config ethern...
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