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Have you looked at creating a NAP or you can do serial connections over bluetooth. Where are those links...
I am thinking about dong this for presence detection.
Here is the PAN and Serial.
I could do with a nap!
I was thinking about bluetooth for communication between the two edisons using NodeJS and MQTT-SN
According to Stephanie this is quite possible, but I've not tried it myself. Edison to Edison Bluetooth | Musings from Stephanie
Given that the deadline is looming I'm dropping that and using Wifi instead. Here's my list of references that seemed relavent whilst I was researching this topic.