I want to link wirelessly to devices and appliances around the home.  ( M2M=
 =3D=3D> machine to machine )
This would include refrigerators, HVAC units, alarms, washing machine, drye=
r, thermostat , water detectors, etc.
They would be talking to a $99 android tablet which has USB , WiFi , and Bl=
uetooth. =20
In some cases the communications are one way.  In others the communication =
is two way.
The M2M network can be very slow.  Even 300 bits per second would be okay. =
 I expect it to be ASCII based.

What would be recommended as the *cheapest approach to retro-fit devices to=
 communicate ?
Infrared ?  Sound ?  RF ?  I would want a really stupid, cheap micro includ=
ed that understands serial communications of a UART persuasion and has a fe=
w bits of GPIO.

Best
Gus

* cheapest hardware cost as software will be amortized over 100s of units. =
     99m2m
--=20
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