I have tried using the command
adb tcpip 5555 to be able to connect wirelessly to my test devices. It's working fine for devices running Android 4.0+, but every 2.x device (like the Galaxy Ace, running 2.3) I have tried gives the same result:
$ adb connect 10.26.5.215 unable to connect to 10.26.5.215:5555
I haven't been able to find anything online that says this feature only works on Android 4 - is this the case?
Will it be possible to connect ADB over TCP/IP on the 2.x devices if I root them?
N.B. I do not want to install custom kernels or ROMs, I want them to be in as similar a state to stock devices as possible.