SO Answer - adb devices ( on android host ) shows no device

### Following commands are running on Beagle Board (Device 1) ###
root@android:/ # getprop ro.product.model
OMAP3EVM
root@android:/ # getprop ro.product.name
beagleboard
root@android:/ # getprop ro.build.version.release        ## OS Version ##
4.0.3
root@android:/ # adb version
Android Debug Bridge version 1.0.29

root@android:/ # adb usb
restarting in USB mode
root@android:/ # adb devices
List of devices attached
YT910C40P9      device


### Following commands are running on Sony Xperia M (Device 2) ###
root@android:/ # adb -s YT910C40P9 shell getprop ro.product.manufacturer
Sony
root@android:/ # adb -s YT910C40P9 shell getprop ro.product.name
C1904_1274-3899
root@android:/ # adb -s YT910C40P9 shell getprop ro.build.version.release   ## OS Version ##
4.1.2
root@android:/ # adb -s YT910C40P9 shell adb version
Android Debug Bridge version 1.0.29