Put this in your ~/.bashrc (or equivalent) file. Then run `reactnativedev "192.168.1.101:8081"`

.bashrc

# Tweak tap coordinates as you wish
function reactnativedev() {
    adb shell input keyevent 82;
    sleep 0.1;
    adb shell input tap 150 1401;
    sleep 0.1;
    adb shell input tap 150 1401;
    sleep 0.1;
    adb shell input text "$1";
    sleep 0.1;
    adb shell input tap 800 771;
    sleep 0.1;
    adb shell input keyevent KEYCODE_BACK;
    sleep 0.1;
    adb shell input text "RR";
}