Android ADB Tricks

Genymotion emulators are already rooted and with SU installed

To fix "adb server version (<server-version>) doesn't match this client (<client-version>); killing...":
Change SDK location https://stackoverflow.com/questions/30757191/adb-and-genymotion-error-adb-server-is-out-of-date-killing-cannot-bind-tc

To find current SDK location:
https://stackoverflow.com/questions/34532063/finding-android-sdk-on-mac-and-adding-to-path

System apps reside in: 
/system/app/<AppName>/<AppName>.apk

Read package name of .apk:
aapt dump badging <path-to-apk> | grep package:\ name

Remove system app in rooted device:
adb shell
su
mount -o rw,remount /system
rm -rf <path-to-apk>
rm -rf /data/data/<package-name>
mount -o ro,remount /system
exit
exit

Start specific activity:
am start -n <yourpackagename>/<Activity-with-absolute-or-relative-path>

Put device into doze mode:
adb devices (it gives you the device serial)
adb -s <device_serial> shell dumpsys battery unplug
adb -s <device_serial> shell dumpsys deviceidle step
the states 'stepped to' were as follows: IDLE_PENDING, SENSING, LOCATING, IDLE.