a very simple bash script that helps connect an Android phone to adb when the USB connection is flaky

adb-autoconnect

#!/usr/bin/env bash

nDevices="0"
nTries="0"

echo "Looking for connected Android devices..."
echo ""

while [ $nDevices -lt 1 ]
do
  nDevices="$(($(adb devices | sed '/^\s*$/d' | wc -l)-1))"
  
  if [ $nDevices -eq 0 ]
  then 
    echo "No Android devices found yet,"
    echo "make sure the USB cable(s) is / are plugged correctly,"
    echo "that the developer options are enabled on the device(s),"
    echo "that USB debugging is enabled on the device(s)"
    echo "within the developer options you have unlocked,"
    echo "and that you accept the authorization request to allow"
    echo "your computer to debug the device(s) - it will hopefully"
    echo "pop on the device(s) once they are detected."
    echo ""
    echo "If all fails, try different USB ports,"
    echo "then different USB cables..."
    echo ""
    
    nTries=$(($nTries + 1))

    echo "Sleeping a bit in order not to kill the CPU."
    echo "This was attempt number #$nTries"

    sleep 1

    echo "let's go again..."
    echo ""
  fi
done

if [ $nDevices -eq 1 ]
then
  echo "Yay, found 1 Android device!"
elif [ $nDevices -gt 1 ]
then
  echo "Wow, found $nDevices Android devices!"
fi

echo ""
echo "Now enabling adb debugging over WiFi, which is"
echo "way, way more convenient."

adb tcpip 5555

echo ""
echo "Now all you have to do to start a remote debugging session"
echo "is to UNPLUG YOUR USB CABLE then"
echo "write 'adb connect <ip>:5555' in a terminal,"
echo "where <ip> is the IP of your phone on your local network."

echo ""
echo "The phone will forget about this setup every once in a while,"
echo "so just re-run this tool."

echo ""
echo "Now UNPLUG USB CABLE"
echo "And happy debugging!"

# this is the static IP of my phone on my own wifi,
# customize to your needs!

sleep 5
adb connect "192.168.0.31:5555"

Yeah, last time it took 101 tries to establish the connection... glad I'm not doing it manually.