get local ipv4 address in nodes

local-ipv4.mjs

/**
 * inspired by: https://github.com/IonicaBizau/local-ip-address
 * 
 * @returns  localIPv4 address
 */
function localIp4Address () {
    const interfaces = Object.values(os.networkInterfaces())
    for (let iface of interfaces) {
        for (let alias of iface) {
            if (alias.family === "IPv4"
             && alias.address !== "127.0.0.1"
             && !alias.internal) {
                console.log( 'IPv4 address', alias.address)
                return alias.address
            }
        }
    }
    throw new Error('IPv4 address not found!')
}