dokucama

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RASPBERRY PI NOTES

By placing Raspberry Pi 4 in a vertical position. This improves airflow around the components and is surprisingly effective at keeping the temperature down.

cat /proc/device-tree/model
vcgencmd measure_temp   # to measure temperature
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq # cpu speed
vcgencmd measure_clock arm

• CPU ====== Headline ======

Overclocking

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INSTALLATION:

fdisk /dev/mmcblk01
W95 FAT32 (LBA)

mkfs.vfat /dev/mmcblk0p1
umount /dev/mmcblk0p1
fsck.vfat /dev/mmcblk0p1 -V
hdparm -t /dev/mmcblk0p1

# https://www.raspberrypi.org/downloads/raspberry-pi-os/
cd /run/media/jaime/7041-8377
unzip /home/jaime/Downloads/2020-02-13-raspbian-buster-full.zip 

wget https://balena.io/etcher/static/etcher-rpm.repo -O /etc/yum.repos.d/etcher-rpm.repo
yum install -y balena-etcher-electron
Or
dd bs=1M if=/home/jsantosa/Downloads/2021-03-04-raspios-buster-armhf-full.img of=/dev/mmcblk0; sync  # destination is whole disk, not partition!
dd if=Damaso256GB.img of=/dev/sdc status=progress bs=4M

FOR HEADLESS INSTALLATION:

• enable ssh , setup pi credentials (no default credentials anymore) + wifi (if needed) can be done with the IMAGER application itself. See https://cycool29.github.io/post/000001

POST INSTALLATION:

• Boot from usb drive https://www.tomshardware.com/how-to/boot-raspberry-pi-4-usb
• After burning raspbian. Do this to prolonge the sdcard life https://ideaheap.com/2013/07/stopping-sd-card-corruption-on-a-raspberry-pi/
• To force fsck at boot: https://raspberrypi.stackexchange.com/questions/61723/raspberry-pi-3-and-raspbian-jessie-how-to-run-fsck-at-boot/61739

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OPENVPN SERVER RASPBERRY PI https://dzone.com/articles/how-to-setup-an-openvpn-server-on-a-raspberry-pi

curl -L https://install.pivpn.io | bash
# set it as static, you should have configured the dhcp reservation and port forwarding in the gw before this!. Nornally not required but this is the server config file /etc/openvpn/server.conf
pivpn add nopass # to create profiles. IMPORTANT: in the .ovpn you have the static pub ip, Replece it with the DNS entry!
#
/var/log/openvpn-status.log       # just 3-4 lines with status
/var/log/openvpn.log
/etc/openvpn/server.conf
# all fields nicely explained here : https://github.com/OpenVPN/openvpn/blob/master/sample/sample-config-files/server.conf

watch cat /var/log/openvpn-status.log  # to monotor the connections real time from the server side
egrep myfavvpn /var/log/openvpn.log    # myfavvpn is the name of the vpn (the ovpn file we imported). The below is the result of a successful connection.
Apr 17 10:15:04 rpi2 ovpn-server[12760]: myfavvpn/77.227.75.59:3578 Data Channel: using negotiated cipher 'AES-256-GCM'
Apr 17 10:15:04 rpi2 ovpn-server[12760]: myfavvpn/77.227.75.59:3578 Outgoing Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
Apr 17 10:15:04 rpi2 ovpn-server[12760]: myfavvpn/77.227.75.59:3578 Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key

! after generating the .ovpn in the server, we scp it to the client and place it in 'camarrealb'
uci set openvpn.camarrealb=openvpn
uci set openvpn.camarrealb.nordvpn.enabled='1'
uci set openvpn.camarrealb.config='/etc/openvpn/camarrealb.ovpn'
uci commit openvpn

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WIREGUARD:

curl -L https://install.pivpn.io | bash # installs server
pivpn add nopass # to create profiles.

• install client OL8 https://www.wireguard.com/install/
• Import config file from server and bring up tunnel https://engineerworkshop.com/blog/how-to-set-up-a-wireguard-client-on-linux-with-conf-file/

service wg-quick@wg0 status

Requires private and private key in both ends:

• Server rpi2
  • root@rpi2:/etc/wireguard
• Client openwrt
  • /root/wireguard

• Setup: server and client : External Link
• Client luci: External Link

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ANYCONNECT CLIENT RASPBERRY PI
https://www.paulligocki.com/cisco-anyconnect-vpn-client-on-raspberry-pi/

sudo openconnect -u username -b vpn.server.com
sudo kill -9 $(pgrep openconnect | awk '{print $1}')

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INSTALL ANTIVIRUS:
https://pimylifeup.com/raspberry-pi-clamav/

apt update
apt upgrade
apt install clamav
clamscan   # wait 5-10 mins before running this or will error

REMOTE DESKTOP:

# server ( install vnc server)
vncpasswd -service
raspi-config # change it so it boots in desktop mode
# CLIENT 
vncviewer

If security errors, try this

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RETROPIE:

/home/pi/.emulationstation
/root/RetroPie/roms  

LFUSE:

• most of the times keyboard
• A in joypad to select emulator: lr-fuse (libreto fuse)
• Set 'RetroPad'
• overlay keyboard
• menu: select-x > retroarch menu > quick menu >
  • settings > input > user1device-type > Kempston

REICAST:

• https://retropie.org.uk/forum/topic/20087/reicast-controller-configuration/2
• https://retropie.org.uk/docs/Dreamcast/#controls