adb-auto-connect.ts

// Download Deno here: https://deno.land/#installation
// Download this file
// Run it using: deno run -A adb-auto-connect.ts [ip address]

import PQueue from 'https://deno.land/x/p_queue@1.0.1/mod.ts'
import ProgressBar from 'https://deno.land/x/progress@v1.2.7/mod.ts'

const hostname = Deno.args[0] ?? '' // <-- set default ip address here to make the argument optional

// Check if it's needed and prompt
const connectedDevices = new TextDecoder().decode(await Deno.run({
  cmd: ['adb', 'devices'],
  stdout: 'piped'
}).output()).split(/\r?\n/g).filter(e => e).slice(1).map(e => e.split('\t')[0])

if (connectedDevices.length > 0) {
  console.log('Already connected to ' + connectedDevices.join(' '))
  console.log('Press y to disconnect and start scanning')
  if (!confirm()) Deno.exit()

  await Deno.run({
    cmd: ['adb', 'disconnect']
  }).status()
}

let foundPort: number | null = null

const queue = new PQueue({ concurrency: 2048 })
const title = 'Scanning:'
const minPort = 37000
const maxPort = 44000
const total = maxPort - minPort

let completed = 0
const progress = new ProgressBar({
  display: ':bar :percent eta :eta',
  title, 
  total
})

for (let port = minPort; port < maxPort; port++) {
  queue.add(async () => {
    if (foundPort) return
    try {
      const conn = await Deno.connect({
        hostname,
        port
      })
      conn.closeWrite()
      foundPort = port
    } catch (e) {}
    progress.render(completed++)
  })
}

if (foundPort === null) {
  await new Promise(resolve => queue.addEventListener('idle', resolve))
}

if (foundPort) {
  const ipPortPair = hostname + ':' + foundPort
  console.log('\n\nConnecting to', ipPortPair)
  await Deno.run({
    cmd: ['adb', 'connect', ipPortPair]
  }).status()
} else {
  console.error('Not found!')
}

// By the way, "-A" means "allow all permissions" but if you want to be
// extra safe replace it with --allow-net=[ip address] --allow-run=adb
// More info here: https://deno.land/manual@v1.24.3/getting_started/permissions

Check multicast DNS version here: https://gist.github.com/qgustavor/3a7798606fb8109c22609780115b71ac