iot-devices-good-comands-and-guides

This Repository are focused to save & distribute knowledge about IOT devices applied to real life in plain english.

Raspberry

Unable And enable WI-FI on Raspberries and Linux based OS

Option 1: Killing wifi

    sudo rfkill block wifi

Option 2: Remove network from wi-fi storage

    sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

Inside this file you will need to remove the variable called as: network

Time sync using N.T.P.:

Network Time Protocol (NTP) is an internet protocol used to synchronize with computer clock time sources in a network.

Do you interesed to learn more?

Watch: https://www.youtube.com/watch?v=oCtkwEjhyD4
For Brazilians: https://www.youtube.com/watch?v=WDimwYFau1I

How to setup this on device?

Setup Timezone:

    sudo timedatectl set-timezone {YOUR TIMEZONE HERE}

Install NTP

    apt-get update && apt-get install ntp -y

    cp -p /etc/ntp.conf /etc/ntp.conf.default

Clear the new archive:

    echo "" > /etc/ntp.conf

    nano /etc/ntp.conf

Have atention on coments about country NTP servers lists, you can find your zone or set global using: https://www.pool.ntp.org/pt/zone/@

Ex. Only For Brazilians:

server a.st1.ntp.br iburst
server b.st1.ntp.br iburst
server c.st1.ntp.br iburst
server d.st1.ntp.br iburst
server gps.ntp.br iburst
server a.ntp.br iburst
server b.ntp.br iburst
server c.ntp.br iburst
server 0.pool.ntp.org iburst
server 1.pool.ntp.org iburst
server 2.pool.ntp.org iburst
server 3.pool.ntp.org iburst

driftfile /var/lib/ntp/ntp.drift
 

# ENABLE LOGS AND STATICS OF USE
statsdir /var/log/ntpstats/
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
 
# PUBLIC NTP SERVERS GLOBAL OR YOU CAN SET ONE OF YOUR REGION USING: https://www.pool.ntp.org/pt/zone/
server 0.pool.ntp.org iburst
server 1.pool.ntp.org iburst
 
# SETUP PERMISSIONS TO RUN
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
restrict 127.0.0.1
restrict ::1

Restart NTP SERVER:

    sudo systemctl restart ntp

Network

How to find all devices on network

    sudo apt-get install nmap \
    && nmap -sn 192.168.1.0/24