#!/bin/bash
SERIAL_NUM="UNKNOWN"
if [ -f /sys/firmware/devicetree/base/serial-number ]; then
    SERIAL_NUM=$(tr -d '\0' </sys/firmware/devicetree/base/serial-number)
else
    SERIAL_NUM=$(cat /proc/cpuinfo | grep Serial | cut -d ' ' -f 2)
    if [[ "$SERIAL_NUM" == "" ]]; then
        # Caution - dmidecode seem to cause issues on some platforms (used on VM)
        SERIAL_NUM=$(sudo dmidecode | grep UUID | cut -d ' ' -f 2)
    elif [[ "$SERIAL_NUM" == "0000000000000000" ]]; then
        # RockPro64 returns 0s (base serial-num should work now)
        if [ -f /home/bitcoin/.mynode/mynode_serial ]; then
            SERIAL_NUM=$(cat /home/bitcoin/.mynode/mynode_serial)
        else
            # Backup, use eth0 mac (some are duplicate?)
            MAC=$(cat /sys/class/net/eth0/address)
            SERIAL_NUM=$(echo "${MAC//:}")
        fi
    fi
fi

echo $SERIAL_NUM