auto connect to Android wireless debugging port and save it for the next time (for MacOS)

android_autoconnect.sh

#!/bin/bash -x
# ip (static) for Android
# ANDROID_DEVICE=192.168.1.45
# ANDROID_DEVICE=192.168.1.85
FILE=~/.adb_port
ANDROID_DEVICE=192.168.1.45

#first test old port
PORT=$(cat "$FILE")

if [[ "$PORT" = "" ]]; then 
    PORT="30001"
fi

echo "\nRestored port: $PORT\n"

ADB=$(adb connect $ANDROID_DEVICE:$PORT)

if [[ "$ADB" =~ connected ]]; then
    echo "Already connected to wireless ADB on $ANDROID_DEVICE:$PORT\n"
    exit 0
fi

# start scan
echo "Not connected. Scanning $ANDROID_DEVICE\n"

NMAP=$(nmap -sT $ANDROID_DEVICE -p30001-49999)

echo NMAP result:"\n$NMAP"

PORT=$(echo "$NMAP" | awk -F/ '/tcp open/{print $1}')

echo "Found port: $PORT. Connecting to $ANDROID_DEVICE:$PORT\n"

echo "$PORT" > $FILE

adb connect $ANDROID_DEVICE:$PORT