How to create a sleep/delay in nodejs that is Blocking?

Question

I\'m currently trying to learn nodejs and a small project I\'m working is writing an API to control some networked LED lights.

The microprocessor controlling the LED

Answer 1

asynchronous call ping command to block current code to execution in specified milliseconds.

• ping command is Cross-platform
• start /b means: start program but not show window.

code as below:

const { execSync } = require('child_process')
// delay(blocking) specified milliseconds
function sleep(ms) {
    // special Reserved IPv4 Address(RFC 5736): 192.0.0.0
    // refer: https://en.wikipedia.org/wiki/Reserved_IP_addresses
    execSync(`start /b ping 192.0.0.0 -n 1 -w ${ms} > nul`)
}

// usage
console.log("delay 2500ms start\t:" + (new Date().getTime() / 1000).toFixed(3))
sleep(2500)
console.log("delay 2500ms end\t:" + (new Date().getTime() / 1000).toFixed(3))

notice important: Above is not a precision solution, it just approach the blocking time