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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Edwin
Yes, the HC-0x bluetooth modules support SNIFF to go into sleep mode.
AT+SNIFF=Param1,Param2,Param3,Param4
Param1: maximum time
Param2: minimum time
Param3: test time
Param4: limited time
I don't know what the best values are.
There's also AT+ENSNIFF=Param and AT+EXSNIFF=Param (Param: Bluetooth address of device).